Feooh/ni, a micron flower-shaped high-performance full-splitting bifunctional electrocatalyst for water 3 the s 2 preparation method

Abstract

The invention is a micron flower spherical high-performance full-splitting bifunctional electrocatalyst FeOOH / Ni 3 S 2 method of preparation. In this method, thiourea and nickel nitrate are used as raw materials, ethanol is used as a solution, and hexadecyltrimethylammonium bromide is used as a surfactant, and Ni is grown in situ on a foamed nickel substrate by a solvothermal method. 3 S 2 , and then by one-step electrochemical deposition on Ni 3 S 2 micron flower spherical FeOOH / Ni 3 S 2 electrocatalyst. The FeOOH / Ni that the present invention obtains 3 S 2 The composite catalyst has low overpotential and good stability, and has broad application prospects in the preparation of electrocatalytic water splitting to produce hydrogen clean energy.

Description

technical field [0001] The invention belongs to the technical field of new functional materials, more specifically, it is a two-step method of solvothermal and electrochemical deposition to in-situ grow micron flower spherical high-performance fully water-splitting bifunctional electrocatalyst FeOOH / Ni on a nickel foam substrate. 3 S 2 preparation methods and applications. Background technique [0002] The current electrocatalytic materials for oxygen evolution and hydrogen evolution reactions are based on noble metal oxides such as iridium dioxide (IrO 2 ), ruthenium dioxide (RuO 2 ) and platinum (Pt), although they have high catalytic performance, they are expensive, scarce resources, high synthesis cost, and poor stability in the catalytic process, easy to react under acidic or alkaline reaction conditions dissolve. Therefore, the development and application of non-noble metal compounds, especially transition metal compounds, as bifunctional electrocatalytic materials...

AI Technical Summary

Problems solved by technology

However, FeOOH as a catalyst cannot show excellent performance due to its own semiconductor characteristics.

Currently Ni 3 S 2 The synthesis method is mainly the use of sulfur powder sintering, which requires high temperature and the discharge of toxic gases such as sulfur dioxide during the reaction process, and the synthesized samples are larger particles, the reaction kinetics is higher, and the larger Tafel slope makes it as a full-scale The application of electrocatalysts for water splitting is greatly limited

[0003] FeOOH cannot exhibit excellent electrocatalytic performance due to its low electrical conductivity

In order to increase the conductivity of FeOOH, people generally load it on noble metal materials with good conductivity, such as gold foil and platinum sheet. Although this method can indeed increase the conductivity of FeOOH and improve its catalytic performance, these substrate materials are expensive and have low reserves. , and the noble metal substrate is easily corroded during the electrochemical process, which affects the stability of the catalyst

Ni 3 S 2 (Nickel disulfide) is a nickel-based sulfide material with very good chemical stability and electrical conductivity, but its bulk material has few reactive sites and its reaction kinetics as a catalyst is poor

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