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Cobalt phosphate and molybdenum trioxide composite nanorod array three-dimensional electrode material and preparation method and application thereof

A cobalt phosphate molybdenum trioxide, nanorod array technology, applied in electrodes, nanotechnology, electrolysis components, etc., can solve the problems of inability to achieve good cycle stability, poor cycle stability, and overall structural damage at the same time, and achieve excellent HER activity, Improves performance, boosts dynamics

Active Publication Date: 2021-11-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past few years, people have extensively studied high-efficiency TMPs-based materials. Most of these materials have Pt-like activity and high current density (>100mA cm-2), but the turbulent flow caused by continuous gas evolution is easy to affect the catalyst. The overall structure causes damage, therefore, the durability and interfacial binding force of the catalyst need to be paid attention to urgently, and it is necessary to design an interface engineering strategy to make the abundant heterogeneous interface fully expose the active region and facilitate the transport of ions / electrons
For example, in the journal Nanoscale (DOI: 10.1039 / c8nr07577h) the growth of NiMoO on nickel foam (NF) by a one-step hydrothermal method was reported. 4 , and then calcined to obtain rod-like self-supporting Ni(PO 3 ) 2 -MoO 3 / NF composite electrode material, at 10mA·cm -2 Under current density conditions, the hydrogen evolution overpotential reaches 86mV, but the cycle stability is poor
In addition, the journal "ADVANCED MATERIALS" (DOI: 10.1002 / adma.202003414) reported the preparation of MoO on carbon cloth by electrodeposition 3 / Ni-NiO composite electrode material, at 10mA·cm -2 Under the condition of current density, the hydrogen evolution overpotential reaches 62mV, but the MoO obtained by the same method 3 would require 659mV to achieve
[0004] To sum up, some of the existing non-precious metal electrocatalytic materials have good catalytic performance but poor cycle stability, and the other part has good stability but poor catalytic performance, which cannot achieve the dual advantages of good cycle stability and high catalytic performance at the same time. effect

Method used

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  • Cobalt phosphate and molybdenum trioxide composite nanorod array three-dimensional electrode material and preparation method and application thereof
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  • Cobalt phosphate and molybdenum trioxide composite nanorod array three-dimensional electrode material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Pretreatment of nickel foam:

[0041] The nickel foam was ultrasonically treated in 3mol / L hydrochloric acid for 10 minutes to remove surface impurities, then washed with deionized water and ethanol for more than three times, and dried in an oven at 60°C to obtain pretreated nickel foam NF.

Embodiment 2

[0043] Pretreatment of nickel foam:

[0044] The nickel foam was ultrasonically treated in 3mol / L hydrochloric acid for 10 minutes to remove surface impurities, then washed with deionized water and ethanol for more than three times, and dried in an oven at 60°C to obtain pretreated nickel foam NF.

[0045] CoO 4 -NiMoO 4 Preparation of / NF nanorods:

[0046] 0.05M Co(NO 3 ) 2 ·6H 2 O and 0.01M (NH 4 ) 2 MoO 4 2H 2 O was dissolved in 30 mL of deionized water and vigorously stirred until dissolved, then the mixed solution and NF were transferred to a Teflon-lined stainless steel autoclave and kept at 180 °C for 6 h. After the heating reaction was completed, it was washed with deionized water and dried under vacuum at 60 °C for 12 h to obtain the purple precursor CoMoO 4 -NiMoO 4 / NF samples.

Embodiment 3

[0048] Pretreatment of nickel foam:

[0049] The nickel foam was ultrasonically treated in 3mol / L hydrochloric acid for 10 minutes to remove surface impurities, then washed with deionized water and ethanol for more than three times, and dried in an oven at 60°C to obtain pretreated nickel foam NF.

[0050] CoO 4 -NiMoO 4 Preparation of / NF nanorods:

[0051] 0.05M Co(NO 3 ) 2 ·6H 2 O and 0.01M (NH 4 ) 2 MoO 4 2H 2 O was dissolved in 30 mL of deionized water and vigorously stirred until dissolved, then the mixed solution and NF were transferred to a Teflon-lined stainless steel autoclave and kept at 180 °C for 6 h. After the heating reaction was completed, it was washed with deionized water and dried under vacuum at 60 °C for 12 h to obtain the purple precursor CoMoO 4 -NiMoO 4 / NF samples.

[0052] CoP 4 -MoO 3 Preparation of / NF:

[0053] The precursor CoMoO 4 -NiMoO 4 / NF sample is placed downstream of the tube furnace, and 1.5gNaH is placed upstream 2 PO ...

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Abstract

The invention relates to a composite material and a preparation technology thereof, in particular to the technical field of alkaline hydrogen evolution electrode materials. The invention discloses a cobalt phosphate and molybdenum trioxide composite nanorod array three-dimensional electrode material and a preparation method and application thereof. Foamed nickel NF is adopted as a support material, a CoMoO4-NiMoO4 composite nanorod array grows on the foamed nickel through a hydrothermal method, after the CoMoO4-NiMoO4 composite nanorod array is soaked in a cobalt nitrate solution, a Co3(PO4)2-MoO3 / NF nanorod array three-dimensional electrode material of an open structure is prepared through a thermal phosphating method, double active components of Co3(PO4)2 nanodots and MoO3 are coupled and interacted synergistically, and excellent hydrogen evolution (HER) performance is achieved. The material provided by the invention has abundant surface active sites and is beneficial to electron transfer; and the composite nanorod array is beneficial to diffusion of gas in the hydrogen evolution process, electrochemical reaction is promoted, and low hydrogen evolution overpotential and long-term stability under large current are achieved.

Description

technical field [0001] The invention relates to a composite material and its preparation technology, in particular to the technical field of an alkaline hydrogen evolution electrode material; in particular to a cobalt phosphate molybdenum trioxide composite nanorod array three-dimensional electrode material and its preparation method and application. Background technique [0002] Pt-based materials are generally considered to be the most active electrocatalysts for HER, but their natural scarcity and high cost limit their large-scale further applications. Currently, single-atom catalysts have been studied to provide an effective way to reduce the amount of platinum while maintaining its high intrinsic activity, but in the HER reaction under alkaline conditions, due to the high activation energy of the water splitting step, the Pt-based catalysts are limited. Alkaline HER activity was about two orders of magnitude lower than that under acidic conditions. Therefore, it remain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/091C25B11/061C25B11/052C25B11/031C25B1/04B82Y40/00
CPCC25B11/091C25B11/061C25B11/052C25B11/031C25B1/04B82Y40/00Y02E60/36
Inventor 唐爱东杨梅肖泽皓杨华明
Owner CENT SOUTH UNIV