A high-efficiency water splitting bifunctional electrocatalyst nicop and its preparation method

Abstract

A high-efficiency water-splitting bifunctional electrocatalyst NiCoP and a preparation method thereof belong to the technical field of preparation of energy conversion materials. Firstly, a Ni / Co precursor with high active surface area and suitable chemical composition was obtained, and on this basis, the precursor was phosphated with hypophosphite as the phosphorus source. It was found that the catalyst exhibited high-efficiency bifunctional electrocatalytic activity. Under alkaline conditions, the overpotential (10mA cm ‑2 ) are 27 mV and 144 mV, respectively, which outperforms most of the reported bifunctional electrocatalysts. At the same time, the preparation process involved in the present invention is simple, and the raw materials are abundant and cheap, which can replace expensive and scarce noble metal-based catalysts, and promote the commercial application of electrochemical total water splitting.

Description

technical field [0001] The invention belongs to the technical field of preparation of energy conversion materials, and provides a water splitting bifunctional electrocatalyst NiCoP and a preparation method thereof. Background technique [0002] With the development of society, the deterioration of the environment and the reduction of fossil energy, people urgently need to find an alternative clean energy. As a clean energy source, hydrogen can be obtained by electrolysis of water. The earth is rich in water resources, and hydrogen production by electrolysis of water has broad application prospects. However, at present, the most effective catalyst for water electrolysis is the noble metal Pt, whose price and earth reserves limit large-scale industrial applications. The development of non-noble metal high-efficiency water splitting electrocatalysts has become a key issue to promote the commercial application of electrochemical water splitting. [0003] Among many catalysts, t...

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Problems solved by technology

But its disadvantage is that the specific surface area of ​​the prepared coating is too small, which leads to poor durability, and it will cause a decline in performance after a period of time.

The patent application number 201410133843.9 discloses a method for preparing a high-performance nickel-based ruthenium-containing composite oxide hydrogen evolution electrode, which mainly adopts a solvothermal synthesis method to grow nickel-ruthenium oxide nanorods in situ on a foamed nickel substrate to obtain The specific surface area of ​​the electrode is large, it is firmly combined with the substrate, there are many active sites and strong catalytic activity, it has excellent hydrogen evolution performance and high stability, but its disadvantage is that the prepared product is highly toxic and easy to pollute surroundings

But its disadvantage is that the phosphating process is complicated, and there is still a big gap in the hydrogen evolution performance of the prepared product compared with the noble metal Pt.

[0004] In addition, during the water splitting reaction, in addition to the hydrogen evolution reaction, there is another half of the reaction, the oxygen generation reaction, and the occurrence of this reaction usually requires the use of noble metal oxides such as RuO 2 , IrO 2 As a catalyst, the cost of water splitting technology is increased, and because the current water splitting technology uses different cathode and anode electrocatalytic materials, the operation is inconvenient, which limits the industrial application of large-scale water splitting technology

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