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A kind of pd@ni-snt/graphene hydrogen evolution catalyst and its preparation method and application

A catalyst and graphene technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve problems such as limiting large-scale applications, high cost, and scarce reserves , to achieve the effect of preventing growth and loss, improving dispersion, large economy and social value

Active Publication Date: 2021-01-08
荷氢新能源科技(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, among various electrode materials, Pt electrode has the best catalytic hydrogen evolution activity, but its scarce reserves and high cost limit its large-scale application.

Method used

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  • A kind of pd@ni-snt/graphene hydrogen evolution catalyst and its preparation method and application
  • A kind of pd@ni-snt/graphene hydrogen evolution catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of 6.2wt% Pd@Ni-SNT / Graphene Hydrogen Evolution Catalyst

[0026] (1) 2g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 80ml deionized water, and excess ammonia solution was added dropwise, so that the solution first formed a precipitate, and then the precipitate gradually dissolved. Under magnetic stirring, 0.4mol / l Na was added dropwise. 2 SiO 3 The solution formed a precipitate, wherein the molar ratio of Ni to Si was 0.3; 3wt% polyvinylpyrrolidone was added, and the stirring was continued for 2h, and the resulting mixture was transferred into a polytetrafluoroethylene-lined hydrothermal reactor, and reacted at 180°C for 24h, naturally Cool to room temperature, centrifuge, wash with deionized water and ethanol several times, dry at 150°C, and bake at 350°C to obtain Ni-SNT;

[0027] (2) Disperse the obtained Ni-SNT in an appropriate amount of ethanol, add 0.3M PdCl 2 solution, wherein the molar ratio of Pd to Ni is 1.1; ultrasonic 2h, so that PdCl 2 Fully fil...

Embodiment 2

[0029] 4.8wt% Pd@Ni-SNT / graphene

[0030] (1) 2g Ni(NO 3 ) 2 ·6H 2 O was dissolved in 80ml deionized water, and excess ammonia solution was added dropwise, so that the solution first formed a precipitate, and then the precipitate gradually dissolved. Under magnetic stirring, 0.2mol / l Na 2 SiO 3The solution forms a precipitate, wherein the molar ratio of Ni to Si is 0.2; add 3wt% polyvinylpyrrolidone, continue to stir for 0.5h, transfer the resulting mixture into a polytetrafluoroethylene-lined hydrothermal reactor, and react at 220°C for 16h, Naturally cooled to room temperature, centrifuged, washed with deionized water and ethanol several times, dried at 150°C, and calcined at 350°C to obtain Ni-SNT;

[0031] (2) Disperse the obtained Ni-SNT in an appropriate amount of ethanol, add 0.3M PdCl 2 solution, wherein the molar ratio of Pd to Ni is 1; ultrasonic 2h, so that PdCl 2 Fully fill in the Ni-SNT silicate nanotube wall, add 8g / l graphene oxide dispersion, continue ult...

Embodiment 3

[0033] Electrochemical tests of the catalysts were performed using an electrochemical workstation.

[0034] The electrolyte solution used was 0.5M H 2 SO 4 Solution, the test temperature is room temperature, the test system is a conventional three-electrode system, the Pd wire electrode is used as the counter electrode, and the Ag / AgCl (10wt% KCl) electrode is used as the reference electrode. All potentials in the test results are adjusted relative to the potential of the reversible hydrogen electrode (vs. RHE). The scanning speed of the linear sweep voltammetry (LSV) test is 5mV / s. Before the measurement, the electrodes are scanned 100 times by cyclic voltammetry at a scanning speed of 50mV / s. figure 2 That is the cyclic voltammetry polarization (LSV) curve of the hydrogen evolution catalyst obtained in Examples 1 and 2 of the present invention. As a comparison, the 6.2wt% PtNi alloy / graphene hydrogen evolution catalyst recorded in the literature and the commercialized 20w...

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Abstract

The invention relates to a Pd@Ni-SNT / graphene hydrogen evolution catalyst and its preparation method and application, and belongs to the technical field of hydrogen production by electrolysis of water. The present invention prepares Ni-silicate nanotubes through an in-situ one-step hydrothermal method. Through the confinement effect of the silicate nanotubes, Pd nanoparticles are coated in the tube wall and compounded with graphene. The silicate nanotubes in the present invention can effectively prevent the growth and loss of Pd nanoparticles, and greatly improve their dispersion, and Pd can form a synergistic effect with the transition metal Ni to further improve the hydrogen evolution activity of the catalyst. The catalyst obtained by the present invention has excellent hydrogen evolution activity when the loading amount of noble metal is relatively low (6.2wt%), and the current density is 10 mA / cm 2 The overpotential is 170mV, which is significantly better than PdNi alloy / graphene with the same load, close to commercial 20wt% Pd / C, and has great economic and social value.

Description

technical field [0001] The invention relates to a Pd@Ni-SNT / graphene hydrogen evolution catalyst and its preparation method and application, belonging to the technical field of hydrogen production by electrolysis of water. Background technique [0002] The electrolytic water process is easy to form industrialization because of its high efficiency. It is the most promising method for hydrogen production. It has the characteristics of simple operation, high product purity, no pollution and economical source of raw materials. Electrolyzed water is to decompose water by passing direct current through acidic or alkaline aqueous solution, hydrogen gas is precipitated at the cathode, and oxygen gas is precipitated at the anode. The theoretical voltage required for water electrolysis is 1.23 V, which is temperature-dependent. However, in practical applications, the voltage required for water decomposition is higher than this theoretical value, and the additional voltage required is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C25B1/04
CPCB01J23/892C25B11/04C25B1/04B01J35/33Y02E60/36
Inventor 孙占仑
Owner 荷氢新能源科技(山东)有限公司
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