Preparation And Properties Of Cu₃P Based Nanocomposites As Electrocatalytic Hydrogen Evolution Electrodes

As the global primary energy consumption rate continues to increase,the excessive use of fossil fuels has exacerbated air pollution and global warming,simultaneously seeking clean,cheap,and sustainable fuels is a major global challenge.As we all know,hydrogen energy is a kind of zero-carbon emission energy,and the electrolysis water hydrogen evolution technology is an effective and direct method to obtain hydrogen.For electrochemical water splitting,there is an urgent need to develop highly efficient and abundant non-noble metal electrocatalysts for hydrogen evolution reaction.The self-supported transitional bimetallic phosphide has excellent catalytic activity and stability.It have broad application prospects in many fields,and is hopeful to become a substitute for precious metal platinum catalysts.This article mainly introduces Cu₃P as the research object to separately composite active materials Fe?PO3?2 and Ni2P to further improve the performance of hydrogen evolution reaction.The specific research contents are as follows:1.First,Cu?OH?2 nanowires were grown in situ on the copper foam by immersion at room temperature,then FeOOH@CuO nanotubes were obtained by hydrothermal method.Finally,self-supported three-dimensional Fe?PO₃?₂@Cu₃P heterostructure nanotube arrays were obtained by low temperature phosphating.The innovation is that the original single nanowire is converted into a nanotube by constructing an iron phosphate active material to increase the active site,so that the two catalysts can synergistically achieve the purpose of improving catalytic performance.The performance of hydrogen evolution reaction is further optimized by changing the FeCl3concentration.The optimal concentration of Fe?PO₃?₂@Cu₃P only requires an overpotential of 108 mV at a current density of 10 mA cm^-22 and a low Tafel slope of 84mV dec^-1.In addition,due to the close contact between the catalyst and the copper foam,Fe?PO₃?₂@Cu₃P has good stability.This research is great significance in the direction of Cu₃P-based nanocomposites for high-efficiency electrocatalysts.2.The Cu?OH?₂ nanowires grown in situ on the copper foam were selected as the substrate,and the self-supported three-dimensional Ni₂P-Cu₃P layered nanorods by copper foam were obtained through one-step hydrothermal and low-temperature phosphating.The original smooth nanowires became sheet nanorods.The contact area between the catalyst and the electrolyte is increased,and more reactive sites are provided.In alkaline media,due to the synergistic effect of Ni2P and Cu3P,the Ni₂P-Cu₃P/CF catalyst exhibits excellent catalytic performance.At current densities of10 mA cm^-22 and 100 mA cm^-2,only over-potentials of 110 mV and 200 mV are required.This catalyst shows long-term catalytic activity,that is,high electrochemical stability.The simple method of preparing Ni2P-Cu3P has opened a new path for exploring self-supporting transition metal phosphides,and has a very broad application prospect in the field of electrocatalytic water decomposition.