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Metal oxide-sulfide composite oxygen evolution electrocatalyst, preparation method and applications thereof

A technology of electrocatalysts and oxides, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of low activity, high cost and poor stability of oxygen evolution electrocatalysts, and achieve catalytic activity High, the synthesis method is simple and controllable, and the effect of reducing overpotential

Active Publication Date: 2019-04-16
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome the defects and deficiencies of existing oxygen evolution electrocatalysts such as high cost, low activity and / or poor stability, and provide a simple and convenient preparation method with low cost and high oxygen evolution activity and stability Metal Oxide-Sulfide Composite Anode Oxygen Evolution Electrocatalyst

Method used

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  • Metal oxide-sulfide composite oxygen evolution electrocatalyst, preparation method and applications thereof
  • Metal oxide-sulfide composite oxygen evolution electrocatalyst, preparation method and applications thereof
  • Metal oxide-sulfide composite oxygen evolution electrocatalyst, preparation method and applications thereof

Examples

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Embodiment 1

[0058] 1. Preparation of metal oxide-sulfide composite oxygen evolution electrocatalyst of the present invention

[0059] (1) Prepare 30 mL of a mixed aqueous solution of 0.02 mol / L zinc nitrate, 0.04 mol / L cobalt nitrate, 0.04 mol / L ammonium fluoride and 0.1 mol / L urea, transfer it to a 40 mL Teflon-lined In the stainless steel hydrothermal reaction kettle, add a piece of clean nickel foam, the area of ​​the foam nickel is 4 cm 2 . The hydrothermal reaction kettle was placed in an oven and heated at 120° C. for 5 hours. The nickel foam with the precursor was taken out, washed and dried, and then heat-treated at 400° C. for 2 hours in the air to obtain the nickel foam with zinc cobaltate nanowires grown.

[0060] (2) In a three-electrode system, nickel-cobalt sulfide nanosheets were electrochemically deposited by cyclic voltammetry: nickel foam with zinc cobaltate nanowires was used as the working electrode, graphite rods were used as auxiliary electrodes, and silver / silver ...

Embodiment 2

[0075] The preparation method is basically the same as in Example 1, except that the number of turns of the electrochemically deposited nickel-cobalt sulfide nanosheets is changed from 15 turns to 20 turns, and the composition of the obtained composite catalyst is basically the same as that in the example. at 10mA / cm 2 The overpotential required to measure the oxygen evolution reaction at a current density of 320 mV is 320 mV.

Embodiment 3

[0077] The preparation method is basically the same as in Example 1, except that the number of turns of the electrochemically deposited nickel-cobalt sulfide nanosheets is changed from 15 turns to 10 turns, and the composition of the obtained composite catalyst is basically the same as that in the example. at 10mA / cm 2 The overpotential required to measure the oxygen evolution reaction at a current density of 335 mV is 335 mV.

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Abstract

The invention discloses a metal oxide-sulfide composite oxygen evolution electrocatalyst, a preparation method and applications thereof, wherein the electrocatalyst is a composite material obtained bycoating zinc cobaltate nano-wires with nickel cobalt sulfide nano-sheets. According to the preparation method, zinc cobaltate nano-wires are synthesized by using a hydrothermal reaction, electrochemical deposition of sulfide nano-sheet is combined, and the zinc cobaltate nano-wires are coated with nickel cobalt sulfide nano-sheets so as to prepare the metal oxide-sulfide composite oxygen evolution electrocatalyst having a core-shell coating structure. According to the present invention, the prepared electrocatalyst has the specially designed chemical composition and the microstructure, such that the active sites and the surface area of the composite catalyst are improved, and the catalyst has high oxygen evolution activity and high stability are achieved compared with other oxide and sulfide electrocatalysts; the preparation method is simple and convenient; by using the low-cost non-precious metal raw materials, the large-scale synthesis of anode oxygen evolution catalysts required for water electrolysis reactions can be easily achieved; and the metal oxide-sulfide composite oxygen evolution electrocatalyst has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials. More specifically, it relates to a metal oxide-sulfide composite oxygen evolution electrocatalyst and its preparation method and application. Background technique [0002] Energy and environment are two important factors to maintain the sustainable development of human society. With the depletion of traditional fossil energy and the air pollution and greenhouse effect associated with the combustion of fossil energy, it is urgent to find a clean and renewable energy to replace fossil fuels. [0003] Hydrogen energy has attracted attention as a non-polluting, high-energy-density energy source. Electrochemical water splitting for hydrogen production has the advantages of simple operation, high electrolytic conversion rate, and no exhaust emissions. It is expected to replace the high-energy-consuming steam reforming hydrogen production technology. However, the current cost of hydrogen p...

Claims

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Application Information

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IPC IPC(8): B01J27/043B01J35/02B01J35/10C25B1/04C25B11/06
CPCC25B1/04B01J27/043C25B11/091B01J35/396B01J35/00B01J35/30B01J35/61Y02E60/36
Inventor 李高仁王辉何序骏
Owner SUN YAT SEN UNIV
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