High-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, method for synthesizing high-performance ultrathin nitride electro-catalyst and application thereof

Abstract

The invention discloses a high-performance ultrathin nitride electro-catalyst with functions of producing hydrogen and oxygen by means of electrochemically totally decomposing water, a method for synthesizing the high-performance ultrathin nitrite electro-catalyst and application thereof. A chemical formula of the high-performance ultrathin nitride electro-catalyst is (Fe<X>Ni<1-X>)<4>N, and the x is larger than 0 and is smaller than 1. The nitrite electro-catalyst is of an ultrathin nanometer plate structure, the size of the nitrite electro-catalyst is 50-100nm, and the thickness of the nitrite electro-catalyst is 1.5-3nm. The method includes synthesizing NiFe hydrotalcite precursors at first; nitriding the NiFe hydrotalcite precursors at high temperatures under the protection of ammonia gas to obtain end products. The high-performance ultrathin nitride electro-catalyst, the method and the application have the advantages that series of nitrite have large specific surface areas, are good in electron conductance and are excellent in performance during electro-catalytic water total-decomposition reaction, limiting currents are higher than limiting currents of Pt / C during electro-catalytic hydrogen evolution reaction (HER), and the performance of the nitride in various aspects are superior to the performance of corresponding oxide NiFe-MMO during oxygen evolution reaction (OER); the electro-catalyst is low in cost, easy and convenient to operate, simple in process and excellent in catalytic performance, and fundamental application research on materials in the field of electro-catalysis can be provided.

Description

technical field

[0001] The invention relates to the field of electrocatalyst and its preparation. More specifically, it relates to an ultra-thin nitride electrocatalyst for high-performance electrochemical total decomposition of water to produce hydrogen and oxygen, as well as its synthesis method and application. Background technique

[0002] With the growing energy crisis, people's demand for renewable green energy is becoming more and more urgent. Water is a renewable clean energy with huge reserves on the earth. It has been widely used in all aspects of human life and production. Total water splitting is an effective means of chemical energy storage. High-efficiency catalysts can improve the total splitting of water by two and a half The reaction efficiency of the reaction.

[0003] Hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) play a vital role in electrochemical energy applications such as fuel cells and total water splitting. However, current...

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