Application Of Non-noble Metal Nanostructured Catalysts Based On Phosphating And Nitrogen Doping In Hydrogen Evolution Reaction

With the urgent need for sustainable social development,the development of green energy storage and conversion technology is crucial.Hydrogen evolution reaction(HER),as a necessary step in various devices such as electrolysis of water and hydrogen fuel cells,has received considerable attention and research in the past decades.HER usually relies heavily on high-performance electrocatalysts to reduce their overpotential and improve reaction kinetics.Currently,precious metals such as gold and platinum are considered to be the most promising catalysts for HER.However,their scarcity,high price and poor stability prevent their wide application.Therefore,it is crucial to explore efficient and low-cost HER catalysts.This paper mainly studied the performance improvement of non-noble metal nanostructured catalysts based on phosphorization and nitrogen doping in hydrogen evolution reaction.The main contents are as follows:(1)Hydrothermal method was used to make WO₃ grow in situ on the treated copper foam substrate,so that the two materials were closely combined.Then,an appropriate amount of sodium hypophosphite was used to phosphatize the material at a relatively high temperature to obtain the Cu₃P/WP₂ composite catalyst,and a series of characterization of its structure and performance testing were conducted.The catalyst is nanowire structure with superior HER performance.At the current density of 10 mA cm^-2,the overpotential is 162 mV,and the tafel slope is 62.5 mV dec^-1.(2)Experiment of radio frequency(RF)plasma assisted synthesis of nitrogen doping.Firstly synthesis of Co O should through the hydrothermal and annealing process,then nitrogen RF plasma process is carried out under the 450?.Under different treatment time,the nitrogen doping amount of catalyst is different,and the properties are also different.Lastly,XRD,SEM,TEM and other related characterization of the materials were carried out.Finally,it was concluded that the material of nitrogen radio frequency treated for 15 minutes,namely N-CoO-15,had the most significant HER performance.The catalyst is nanowire structure with an overpotential of 112 mV at the current density of 10 mA cm^-2.