P,Nd双掺杂MoNiO_(x)异质结电催化全解水性能研究

P,Nd co-doped MoNiO_(x) Hetero-nanoarchitecture for efficient overall water electrolysis

电解水制氢是减少二氧化碳排放,促进“碳达峰,碳中和”目标达成的有效方式。电催化剂是决定电解水效率的关键。本文合成了一种P和Nd双掺杂MoNiO x异质结构高效全解水催化剂(PMoNiNd)。研究表明:P和Nd可以调控MoNiO x的电子结构,从而优化了析氢反应和析氧反应中间体的吸附能,提高了催化剂的析氢析氧催化活性。在三电极体系下(1 mol/L KOH),所获得的此种催化剂在析氢和析氧反应中表现出较好的催化活性,在电流密度为10、100 mA/cm 2的条件下,分别所需的过电位仅为12.9、182.1 mV,107.7、328 mV。经全解水测试表明,该种催化剂具有优异的稳定性,在25 h连续稳定性测试中,电压没有明显增加,仅需1.58 V的槽压即可实现10 mA/cm^(2)的全解水反应,优于目前绝大多数全解水电催化剂的催化性能。

Water electrolysis for hydrogen production is an effective way of reducing carbon dioxide emissions and achieving the goal of‘carbon peak and neutrality.Electrocatalysis of hydrogen evolution and oxygen evolution reactions play a determining role for the overall efficiency of water electrolysis.Herein,P and Nd co-doped MoNiO_(x) heterostructure grown onto nickel foam was synthesized by hydrothermal method for highly efficient water electrolysis.The results show that the co-introduction of P and Nd can effectively regulate the electronic structure of MoNiO_(x),which can optimize the adsorption energy of intermediates in hydrogen and oxygen evolution reactions,presenting excellent performance of water electrolysis.In hydrogen and oxygen evolution reactions,the required overpotentials are only 12.9,182.1 mV and 107.7,328 mV at 10 mA/cm 2 and 100 mA/cm 2,respectively.Meanwhile,the overall water splitting test further demonstrates that a small voltage of 1.58 V is required to achieve 10 mA/cm 2,which is superior to the majority of water electrolysis catalysts reported.