Heterogeneous electrocatalyst and method for its preparation

Abstract

The disclosure provides a preparation method of a hetero-phase junction electrocatalyst, comprising: dispersing a target nanowire material in a solution of a ruthenium source, obtaining amorphous RuSe 2‑ x Te x nanowires, wherein 0 < x < 2; washing and drying the amorphous RuSe 2‑x Te x nanowires, and performing annealing treatment on the amorphous RuSe 2‑x Te x nanowires to partially convert the amorphous RuSe 2‑x Te x nanowires into crystalline RuSe 2‑x Te x nanowires, to obtain RuSe 2‑x Te x amorphous nanowires, RuSe 2‑x Te x crystalline nanowires, wherein 0 < x < 2.

Description

TECHNICAL FIELD

[0001] The present disclosure belongs to the field of nanotechnology, and particularly relates to a heterogeneous junction electrocatalyst and a preparation method thereof. BACKGROUND

[0002] Hydrogen energy, as one of the ideal clean energies, plays an important role in the global energy development trend from fossil fuels to sustainable and non-polluting non-fossil energy. Electrocatalytic dehydrogenation (HER) refers to the production of hydrogen gas by using a catalyst through an electrochemical method, which is an important means to achieve industrialized and inexpensive hydrogen production.

[0003] The electrode material used for electrolysis of water to produce hydrogen under alkaline conditions is robust and durable, and the structure of the electrolytic tank has a low cost, therefore, the alkaline electrolysis method is more preferred in industry. However, the commonly used electrocatalyst does not meet the current development needs due to low efficiency and poor stability. For example, the commonly used Pt / C electrocatalyst has poor reaction kinetics under alkaline conditions, which seriously affects the efficiency of electrolysis of water to produce hydrogen. Therefore, it is of great significance to provide an electrocatalyst with good stability and high catalytic performance under alkaline conditions. SUMMARY

[0004] Therefore, in order to solve the problem of poor reaction kinetics and low electrocatalytic performance of the conventional electrocatalyst under alkaline conditions, and to find an electrocatalyst with good stability and high efficiency of electrolysis of water, the present disclosure provides a heterogeneous junction electrocatalyst and a preparation method thereof, which accelerates the activation performance of water and improves the efficiency of electrocatalytic dehydrogenation reaction.

[0005] In one aspect of the present disclosure, a preparation method of a heterogeneous junction electrocatalyst is provided, comprising:

[0006] dispersing the target nanowire material in a solution of a ruthenium source, and obtaining amorphous RuSe 2- x Te x nanowire, wherein 0 < x < 2;

[0007] washing and drying the amorphous RuSe 2-x Te x nanowire, and then performing annealing treatment to convert part of the amorphous RuSe 2-x Te x nanowire into crystalline RuSe 2-x Te x nanowire, to obtain RuSe 2-x Te x heterogeneous junction electrocatalyst.

[0008] According to the embodiment of the present disclosure, the target nanowire material includes a selenium-tellurium nanowire material.

[0009] According to the embodiment of the present disclosure, the ruthenium source is selected from one or more of ruthenium chloride trihydrate, ammonium chlororuthenate, ruthenium acetylacetonate, and ruthenium oxide.

[0010] According to the embodiment of the present disclosure, the reaction temperature of the hydrothermal reaction includes 140-200℃, and the reaction time of the hydrothermal reaction includes 6-18h.

[0011] According to the embodiment of the present disclosure, the amorphous structure of RuSe 2-x Te x After the nanowire is washed and dried, annealing treatment is performed, including:

[0012] The amorphous structure of RuSe 2-x Te x After the nanowire is washed and dried, annealing treatment is performed in an Ar / H2 atmosphere at a temperature rising rate of 1-10℃ / min to an annealing temperature, for 1-10h.

[0013] According to the embodiment of the present disclosure, the annealing temperature includes 100-700℃.

[0014] In another aspect of the present disclosure, a heterojunction electrocatalyst obtained by the above preparation method is provided, including: RuSe 2-x Te x amorphous structure, RuSe 2-x Te x crystalline structure, wherein 0

[0015] According to the embodiment of the present disclosure, the heterojunction electrocatalyst is a one-dimensional nanowire material with a diameter less than 100nm.

[0016] According to the embodiment of the present disclosure, the RuSe 2-x Te x The crystalline structure is a cubic phase crystal type.

[0017] According to the embodiment of the present disclosure, the RuSe 2-x Te x amorphous structure, RuSe 2-x Te x The crystalline structure is uniformly distributed.

[0018] The heterojunction electrocatalyst and the preparation method thereof provided by the present disclosure have the following beneficial effects:

[0019] According to the embodiments of the present disclosure, by constructing the heterogeneous structure of amorphous phase and crystalline phase, due to the difference in work function and electrical properties between the two phases, the electron transfer between the two phases makes the interface expose more electrocatalytic active sites, which helps the protons in the electrocatalytic hydrogen evolution reaction to form H* on the active sites in the crystalline phase region ads , accelerates the activation of water, improves the reaction speed of the Volmer step in the alkaline electrocatalytic hydrogen evolution reaction process, and is beneficial to the recombination of the subsequent intermediate product H* ads and the release of H2. The synergistic effect of these characteristics improves the electrocatalytic performance of the heterogeneous structure. It provides a new way for the design and development of hydrogen evolution electrocatalyst materials with high efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a transmission electron microscope (TEM) image of a RuSe m Te n @Se 1-m-n nanowire material in the present disclosure;

[0021] Figure 2 is a transmission electron microscope (TEM) image of a RuSe 2-x Te x nanowire material in the present disclosure;

[0022] Figure 3 is a high-resolution transmission electron microscope (HRTEM) image of a RuSe 2-x Te x nanowire material in the present disclosure;

[0023] Figure 4 is a diffraction of x-rays (XRD) image of a RuSe 2-x Te x nanowire material in the present disclosure;

[0024] Figure 5 is a transmission electron microscope (TEM) image of a RuSe 2-x Te x heterojunction electrocatalyst in the present disclosure;

[0025] Figure 6 is a diffraction of x-rays (XRD) image of a RuSe 2-x Te x heterojunction electrocatalyst in the present disclosure;

[0026] Figure 7 RuSe 2-x Te x High resolution transmission electron microscopy (HRTEM) of heterogeneous junction electrocatalyst;

[0027] Figure 8 RuSe 2-x Te x EDS (Energy Dispersive Spectroscopy) elemental mapping of heterogeneous junction electrocatalyst;

[0028] Figure 9 RuSe 2-x Te x Current-voltage plot of heterogeneous junction electrocatalyst;

[0029] Figure 10 RuSe 2-x Te x Voltage-time plot of heterogeneous junction electrocatalyst. DETAILED DESCRIPTION

[0030] In order to make the objects, technical solutions and advantages of the present disclosure clearer, the present disclosure will be further described in detail below with reference to specific embodiments and drawings.

[0031] The endpoints of the ranges and any values disclosed in the present disclosure are not limited to the precise values recited. The ranges or values should be interpreted as being approximate, and include values near the recited values. For numeric values, the endpoints of each range, the endpoints of each range and individual point values, and individual point values can be combined with one another to generate one or more new numeric ranges, which should be considered as being specifically disclosed in the present disclosure.

[0032] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to be limiting of the present disclosure. As used herein, the term "includes" and tenses thereof, means that the named feature, step, operation, or component is included, but not to the exclusion of one or more other features, steps, operations, or components.

[0033] All terms used herein, including technical and scientific terms, have the meanings commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein are to be interpreted as having a meaning that is consistent with the understanding of a person of ordinary skill in the art, and should not be interpreted in an idealized or overly formal manner.

[0034] In this disclosure, the term "heterogeneous junction" refers to a material containing different crystalline phases with interfaces between them to facilitate the transfer and separation of electrons and holes. In a heterogeneous junction, the metal atoms of the crystalline phase are connected by strong chemical bonds, forming a structure with a high degree of long-range ordered crystallinity; while the amorphous phase structure exposes a large number of unsaturated chemical bonds, providing more active sites for capturing electrons and reaction intermediates. Due to the difference in internal structure between the amorphous and crystalline phases, their work functions differ, with the work function of the crystalline phase structure being greater than that of the amorphous phase structure. Electrons transfer at the interface between the two phases, and the crystalline phase region with the higher work function has a stronger ability to capture electrons. Some electrons transfer from the amorphous phase region to the crystalline phase region, resulting in the amorphous phase region being positively charged and the crystalline phase region being negatively charged. This facilitates the formation of the intermediate product H* by protons at the active sites in the crystalline phase region during the electrocatalytic hydrogen evolution reaction. ads This accelerates water activation, speeds up the Volmer step in the alkaline HER process, and benefits the subsequent intermediate product H*. ads The recombination and H2 release are observed. Meanwhile, electrochemical active surface area measurements show that the exposure of the two-phase interface allows for more active sites, and the synergistic effect of these characteristics enhances the electrocatalytic performance of the heterogeneous structure.

[0035] Based on the problems of low efficiency and poor stability of electrocatalysts in related technologies, this application provides a heterogeneous junction electrocatalyst material. This electrocatalyst material accelerates the electrocatalytic reaction kinetics and improves the performance of the electrocatalyst by adjusting the length of the interface between the crystalline phase and the amorphous phase.

[0036] In one aspect of this disclosure, a method for preparing a heterogeneous junction electrocatalyst is provided, comprising:

[0037] The target nanowire material was dispersed in a ruthenium source solution, and an amorphous RuSe phase was obtained through a hydrothermal reaction. 2- x Te x Nanowires, in which 0 <x<2;

[0038] amorphous RuSe 2-x Te x After washing and drying, the nanowires are annealed to transform the amorphous RuSe phase. 2-x Te x The nanowires are partially transformed into a crystalline phase structure RuSe. 2-x Te x Nanowires, yielding RuSe 2-x Te x Heterogeneous junction electrocatalyst.

[0039] According to the embodiment of the present disclosure, by constructing the heterogeneous structure of amorphous phase and crystalline phase, due to the difference in work function and electrical properties between the two phases, the electron transfer between the two phases makes the interface expose more electrocatalytic active sites, which helps the protons in the electrocatalytic hydrogen evolution reaction to form H* on the active sites in the crystalline phase region ads , accelerates the activation of water, improves the reaction rate of the Volmer step in the alkaline electrocatalytic hydrogen evolution reaction process, and is beneficial to the recombination of the subsequent intermediate product H* ads and the release of H2. The synergistic effect of these characteristics improves the electrocatalytic performance of the heterogeneous structure. It provides a new way for the design and development of hydrogen evolution electrocatalyst materials with high efficiency.

[0040] According to the embodiment of the present disclosure, the target nanowire material includes a selenium-tellurium nanowire material.

[0041] According to the embodiment of the present disclosure, the chemical formula of the selenium-tellurium nanowire material is Te m Se n @Se 1-m-n , wherein 0

[0042] According to the embodiment of the present disclosure, the selenium-tellurium nanowire material is a core-shell structure, and part of the selenium as a shell structure wraps the alloy composed of tellurium and the remaining selenium. The selenium-tellurium nanowire material is converted into an amorphous phase structure of RuSe 2- x Te x nanowire material through a hydrothermal reaction with a ruthenium source.

[0043] According to the embodiment of the present disclosure, the ruthenium source is selected from one or more of ruthenium chloride trihydrate, ammonium ruthenium chloride, ruthenium (III) acetylacetone, and ruthenium oxide.

[0044] According to the embodiment of the present disclosure, ruthenium, as a noble metal material in the same group as platinum, has strong binding ability with water under alkaline conditions and lower cost than platinum material.

[0045] According to the embodiment of the present disclosure, the reaction temperature of the hydrothermal reaction includes 140-200℃, and the reaction time of the hydrothermal reaction includes 6-18h.

[0046] According to the embodiment of the present disclosure, within this range of hydrothermal conditions, an amorphous phase structure of RuSe 2-x Te xThe nanowire material, wherein the reaction temperature of the hydrothermal reaction is selected from 140 DEG C, 160 DEG C, 180 DEG C, 200 DEG C, etc., and preferably is 180 DEG C; and the reaction time of the hydrothermal reaction is selected from 6 h, 9 h, 15 h, 18 h, etc., and preferably is 12 h.

[0047] According to the embodiment of the present disclosure, the heating rate to the temperature required by the hydrothermal reaction is 5-10 DEG C / min, preferably 8-10 DEG C / min, and more preferably 9 DEG C / min.

[0048] According to the embodiment of the present disclosure, after the hydrothermal reaction is completed, the amorphous RuSe 2-x Te x The nanowire material is cooled to room temperature. The cooling method is known to those skilled in the art, and is not particularly limited. In specific embodiments, natural cooling can be used.

[0049] According to the embodiment of the present disclosure, the amorphous RuSe 2-x Te x After the nanowire material is cooled, centrifugation and washing treatment are required. The washing method is preferably multiple washing with deionized water and ethanol.

[0050] According to the embodiment of the present disclosure, the amorphous RuSe 2-x Te x In the nanowire material, 0 < x < 2, and in specific embodiments, x is selected from 0.08.

[0051] According to the embodiment of the present disclosure, the amorphous RuSe 2-x Te x After the nanowire material is obtained, it is washed with deionized water, and the number of centrifugal washing is selected from 2-6 times, such as 2 times, 3 times, 4 times, and 6 times. After washing, the amorphous RuSe 2-x Te x The nanowire is subjected to ultrasonic dispersion treatment in deionized water to make it completely dispersed, and the ultrasonic time is selected from 10-60 min, preferably 20-50 min, and more preferably 30 min. After dispersion, the amorphous RuSe 2-x Te x The nanowire is subjected to freeze-drying treatment, preferably liquid nitrogen freeze-drying treatment, and the freeze-drying time is selected from 1-5 days, such as 1 day, 2 days, 3 days, and 4 days. After freeze-drying, the amorphous RuSe 2-x Te x Nanowire sample powder is obtained.

[0052] According to the embodiment of the present disclosure, the amorphous RuSe 2-x Te xAfter washing and drying, the nanowires undergo annealing treatment, including:

[0053] amorphous RuSe 2-x Te x After washing and drying, the nanowires are annealed for 1 to 10 hours in an Ar / H2 atmosphere at a heating rate of 1 to 10 °C / min to the annealing temperature.

[0054] According to embodiments of this disclosure, the annealing temperature includes 100–700°C.

[0055] According to embodiments of this disclosure, within this annealing condition range, RuSe with excellent performance can be obtained. 2-x Te x Heterogeneous junction electrocatalysts. Different annealing temperatures and times can yield RuSe with varying interfacial lengths. 2-x Te x In practical applications, annealing temperatures exceeding 700℃ for heterogeneous nanowires can cause the amorphous RuSe phase to deteriorate. 2-x Te x The nanowire material was completely transformed into the crystalline phase RuSe. 2-x Te x Nanowire materials.

[0056] According to embodiments of this disclosure, the annealing temperature can be selected from 200℃, 400℃, 500℃, 600℃, etc.; the annealing time can be selected from 2h, 6h, 8h, 10h, etc.; the heating rate can be selected from 1 to 6℃ / min, preferably 4 to 6℃ / min, and more preferably 5℃ / min.

[0057] According to an embodiment of this disclosure, after annealing, RuSe is obtained by natural cooling. 2-x Te x Heterogeneous junction electrocatalyst, where x represents RuSe 2-x Te x The amount of Te in the heterogeneous electrocatalyst, x can take any value greater than 0 and less than 2. In a specific embodiment, x is preferably 0.08.

[0058] In another aspect of this disclosure, a heterogeneous junction electrocatalyst obtained according to the above preparation method is proposed, comprising: RuSe 2-x Te x Amorphous phase structure, RuSe 2-x Te x In the crystalline phase structure, 0 <x<2。

[0059] According to the embodiment of the present disclosure, by constructing the hetero-junction structure of amorphous phase and crystalline phase, due to the difference in work function and electrical properties between the two phases, the electron transfer between the two phases makes the interface expose more electrocatalytic active sites, which helps the protons in the electrocatalytic hydrogen evolution reaction to form H* on the active sites in the crystalline phase region ads , accelerates the activation of water, improves the reaction speed of the Volmer step in the alkaline electrocatalytic hydrogen evolution reaction process, and is beneficial to the recombination of the subsequent intermediate product H* ads and the release of H2. The synergistic effect of these characteristics improves the electrocatalytic performance of the hetero-junction.

[0060] According to the embodiment of the present disclosure, the hetero-junction electrocatalyst is a one-dimensional nanowire material with a diameter of less than 100 nm.

[0061] According to the embodiment of the present disclosure, the RuSe 2-x Te x The crystalline phase structure is a cubic phase crystal.

[0062] According to the embodiment of the present disclosure, the RuSe 2-x Te x The amorphous phase structure, RuSe 2-x Te x The crystalline phase structure is uniformly distributed.

[0063] Embodiment

[0064] S1: RuSe 2-x Te x Nanowire material preparation

[0065] Mix 0.25 mmol of ruthenium chloride trihydrate (RuCl3·3H2O) and 0.5 mmol of Te m Se n @Se 1-m-n (0 < m < 1, 0 < n < 1, 0 < m + n < 1) nanowires and stir uniformly to obtain a mixed solution. After ultrasonic treatment for 15 min, the mixed solution is transferred to a 100 mL polytetrafluoroethylene liner and packaged in a stainless steel autoclave. The stainless steel autoclave is sealed and heated in an oven at a temperature of 180°C for 12 hours, with a heating rate of 8-10°C / min. After the reaction is completed, the stainless steel reactor is cooled to room temperature, and the obtained mixed solution is centrifuged at a speed of 10000 rpm for 2 min to obtain an amorphous phase structure RuSe 2-x Te x Nanowire material, and washed with deionized water 4 times for standby.

[0066] S2: RuSe 2-x Te x Hetero-junction electrocatalyst preparation

[0067] The amorphous structure of RuSe 2-x Te x The nanowire material was dispersed in deionized water and then ultrasonically treated for 30 min until it was completely dispersed. It was freeze-dried using liquid nitrogen, and the drying time was 3 days.

[0068] The amorphous structure of RuSe 2-x Te x The nanowire material was taken out and annealed using a tube furnace: the obtained sample was placed in a porcelain boat, annealed at a temperature of 300°C for 2 h under an Ar / H2 atmosphere, and the annealing temperature was raised at a rate of 5°C / min. Then, it was naturally cooled to obtain RuSe 2-x Te x Heterogeneous junction electrocatalyst.

[0069] The amorphous structure of RuSe 2-x Te x The morphology of the nanowire material

[0070] Figure 1 The TEM image of the Te m Se n @Se 1-m-n Nanowire material.

[0071] As Figure 1 shown, the internal ultrastructure of the nanowire material obtained in step S1 was observed and analyzed using a transmission electron microscope to obtain a transmission electron microscope image. Analysis showed that the Te m Se n @Se 1-m-n Nanowire material. m Se n @Se 1-m-n The diameter of the Te

[0072] Figure 2 The TEM image of the amorphous structure of RuSe 2-x Te x Nanowire material. Figure 3 The HRTEM image of the amorphous structure of RuSe 2-x Te x Nanowire material.

[0073] As Figure 2 shown, the internal ultrastructure of the nanowire material obtained in step S1 was observed and analyzed using a transmission electron microscope to obtain a transmission electron microscope image. Analysis showed that the Te Figure 3The amorphous structure of the RuSe 2-x Te x The microstructure and composition information of the nanowire material can be seen that the structure of the nanowire material obtained in step S1 of the example is loose, and the crystallinity is low, and basically no crystalline phase is formed, proving that the hydrothermal reaction generates the RuSe

[0074] Figure 4 The amorphous structure of the RuSe 2-x Te x The X-ray diffraction pattern (XRD) of the nanowire material.

[0075] As Figure 4 shown, the X-ray diffraction analysis of the nanowire material obtained in step S1 of the example. Among them, the XRD spectrum shows no obvious crystalline phase characteristic peak, proving that the nanowire material obtained in step S1 of the example is mainly amorphous structure.

[0076] In combination Figures 2 to 4 The microstructure and composition information of the RuSe 2-x Te x The nanowire material can be seen that the structure of the nanowire material obtained in step S1 of the example is loose, and the crystallinity is low, and basically no crystalline phase is formed, proving that the hydrothermal reaction generates the RuSe 2-x Te x Nanowire material.

[0077] The morphology of the RuSe 2-x Te x Heterojunction electrocatalyst

[0078] Figure 5 The transmission electron microscopy (TEM) of the RuSe 2-x Te x Heterojunction electrocatalyst. Figure 6 The X-ray diffraction pattern (XRD) of the RuSe 2-x Te x Heterojunction electrocatalyst.

[0079] The microstructure of the nanowire material obtained in step S2 of the example is observed and analyzed using transmission electron microscopy and powder X-ray diffraction, and the transmission electron microscopy and X-ray spectrum thereof are obtained.

[0080] As Figure 5 shown, the morphology of the RuSe 2-x Te x Nanowire material is basically unchanged, but due to high-temperature annealing, it is partially crystallized, thereby showing a more compact microstructure.

[0081] As shown in Figure 6 RuSe 2-x Te x The XRD spectrum of the nanowire material shows diffraction peaks, which can be attributed to cubic RuSe2(JCPDS card No. 78-0670). The XRD spectrum also shows that the RuSe 2-x Te x The nanowire has poor crystallinity, and the amorphous RuSe 2-x Te x The nanowire material gradually crystallizes under high-temperature annealing treatment, and RuSe 2-x Te x hetero-junction electrocatalyst.

[0082] Figure 7 is the RuSe 2-x Te x hetero-junction electrocatalyst in the present disclosure.

[0083] As shown in Figure 7 RuSe 2- x Te x hetero-junction electrocatalyst. The image shows that the RuSe 2-x Te x hetero-junction electrocatalyst has both crystalline and amorphous phases. The crystalline phase is cubic RuSe2, and the interplanar spacing of its (200) is 0.34 nm.

[0084] Test Example 3 RuSe 2-x Te x hetero-junction electrocatalyst

[0085] Figure 8 is the RuSe 2-x Te x hetero-junction electrocatalyst in the present disclosure.

[0086] As shown in Figure 8 RuSe 2-x Te x hetero-junction electrocatalyst, and the EDS element mapping thereof is obtained. The Ru and Se elements in the RuSe 2-x Te x hetero-junction electrocatalyst are uniformly distributed in the hetero-junction, and the Te element shows a low signal due to its low content, which is consistent with the Figure 6The results of the XRD patterns are consistent.

[0087] Test Example 3 RuSe 2-x Te x Analysis of the electrocatalytic performance of the heterogeneous junction electrocatalyst

[0088] Figure 9 RuSe 2-x Te x Current-voltage pattern of the heterogeneous junction electrocatalyst. Figure 10 RuSe 2-x Te x Voltage-time pattern of the heterogeneous junction electrocatalyst.

[0089] Analysis of the electrocatalytic hydrogen production performance of the amorphous phase structure RuSe 2-x Te x Nanowire material and RuSe 2-x Te x The electrocatalytic hydrogen production performance of the heterogeneous junction electrocatalyst was analyzed to obtain its current-voltage pattern and current-time pattern.

[0090] As Figure 9 shown, the RuSe 2-x Te x Heterogeneous junction electrocatalyst prepared in the present disclosure has an overpotential of about 21 mV under the condition of 10 mA·cm -2 The overpotential of the commercial conventional Pt / C catalyst under the same condition is 67 mV, which proves that the RuSe 2-x Te x Heterogeneous junction electrocatalyst prepared in the present disclosure has an overpotential smaller than that of the conventional Pt / C catalyst, i.e., the RuSe 2-x Te x Heterogeneous junction electrocatalyst is closer to the equilibrium potential, and has better catalytic performance.

[0091] The electrocatalytic hydrogen production performance of the RuSe 2-x Te x Heterogeneous junction electrocatalyst was tested under the condition of 1M KOH (pH = 14) using the rotating disc electrode method. The RuSe 2-x Te x Heterogeneous junction electrocatalyst has an overpotential of about 21 mV under the condition of a current density of 10 mA·cm -2 , which is significantly better than that of the amorphous phase structure RuSe 2-x Te x Nanowire material without annealing. Analysis shows that the combination of amorphous phase / crystalline phase constitutes a heterogeneous junction structure, increases the adsorption of the reaction intermediate H ads on the electrocatalyst, accelerates the dissociation of H2, and thus makes the RuSe 2-x Tex The heterogeneous junction electrocatalyst exhibits excellent electrocatalytic activity.

[0092] As shown in Figure 10 RuSe 2-x Te x The heterogeneous junction electrocatalyst achieves stability of about 30 h at a current density of 100 mA·cm -2 The RuSe 2-x Te x The heterogeneous junction electrocatalyst exhibits good chemical stability and corrosion resistance.

[0093] The above-described specific embodiments further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above-described specific embodiments are merely specific embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A method for preparing a heterogeneous junction electrocatalyst, comprising: dispersing the target nanowire material in a solution of a ruthenium source to obtain an amorphous phase structure of RuSe by hydrothermal reaction 2-x Te x a nanowire, wherein 0 < x < 2, the target nanowire material comprises a selenium tellurium nanowire of a chemical formula of Te m Se n @Se 1-m-n , 0 < m < 1, 0 < n < 1, 0 < m + n < 1, the selenium tellurium nanowire material is a core-shell structure, and part of the selenium is wrapped as a shell structure around an alloy composed of tellurium and the remaining selenium; RuSe 2-x Te x RuSe 2-x Te x RuSe 2-x Te x RuSe 2-x Te x hetero-phase junction electrocatalyst.

2. The production method according to claim 1, wherein the ruthenium source is selected from one or more of ruthenium chloride trihydrate, ammonium chlororuthenate, ruthenium acetylacetonate, and ruthenium oxide. 3.The method according to claim 1, wherein, the reaction temperature of the hydrothermal reaction is 140-200 ℃; the reaction time of the hydrothermal reaction is 6-18 h.

4. The production method according to claim 1, wherein The RuSe 2-x Te x The nanowires are annealed after washing and drying, comprising: RuSe 2-x Te x After washing and drying, the nanowires were annealed in an Ar / H2atmosphere at an annealing temperature for 1-10 h at a heating rate of 1-10 °C / min.

5. The production method according to claim 4, wherein the annealing temperature is 100-700 ℃.

6. A heterogeneous electrocatalyst prepared by the process of any one of claims 1 to 5, comprising: RuSe 2- x Te x amorphous phase structure, RuSe 2-x Te x crystalline phase structure, where 0 < x < 2.

7. The heterogeneous electrocatalyst of claim 6, wherein, the heterogeneous junction electrocatalyst is a one-dimensional nanowire material with a diameter less than 100 nm.

8. The heterogeneous electrocatalyst of claim 6, wherein, RuSe 2-x Te x The crystalline phase structure is cubic.

9. The heterogeneous electrocatalyst of claim 6, wherein, The RuSe 2-x Te x Amorphous phase structure, RuSe 2-x Te x Crystalline phase structure is uniformly distributed.

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