摘要
The development of highly active and easily coupled non-noble metal electrocatalysts for oxygen evolution reaction(OER)and hydrogen evolution reaction(HER)is of great significance for the H_(2) production by water electrolysis.Here,we have shown an anion-modulated HER and OER activity of 1D Co-Mo based interstitial compound heterojunctions for effective overall water splitting.The Co-Mo based complex nanowires from a one-pot route with high yields can be converted into MoC-Co heterojunction nanowires under N_(2) atmosphere,while a pyrolysis under NH_(3) can give CoMoN-CoN heterostructures.The work function revealed Mott-Schottky effect between interfaces of two heterostructures,which can introduce electron redistribution and thus promote the HER/OER process.The MoC-Co heterojunction nanowires delivers good HER activity at a low overpotential of 39mV to afford a current density of 10mA/cm^(2).Density functional theory calculations show that the heterogeneous interface formed between the Co and MoC optimizes the hydrogen adsorption free energy.Concurrently,CoMoN-CoN heterojunction nanowires exhibits good OER performance with a low overpotential of 260mV to reach 10mA/cm^(2),being superior to RuO_(2).The two catalysts can be coupled to assemble a two-electrode cell with a solarto-hydrogen efficiency of 12.3%at 1.54 V.This work provides an effective means to design easily coupled HER and OER catalysts for H_(2) production by water electrolysis.
基金
support of this research by the National Natural Science Foundation of China(No.91961111)
the Natural Science Foundation of Heilongjiang Province(No.ZD2021B003)
Fundamental Research Funds for the Central Universities(No.2572022BU05).
