CoP/Co2P/C纳米材料用于全pH值电催化析氢

CoP/Co_2P/C composite as efficient electrocatalyst for hydrogen evolution reactions over the whole pH range

在氮气下一步退火含有植酸和钴的前驱体,合成了一种新型的CoP/Co2P/C复合纳米材料作为电催化剂,该催化剂在全pH值范围下表现出优异的电催化析氢活性和稳定性.在0.5mol/L的硫酸中,电流密度为10mA/cm^2时,过电位为135mV.在1mol/L KOH溶液中,CoP/Co_2P/C催化剂需要141 mV的过电位才能使电流密度达到10 mA/cm^2,在0.1mol/L磷酸盐缓冲溶液中,需要155mV的过电位才能使电流密度达到10mA/cm^2.这种优异的析氢活性主要归因于CoP/Co_2P纳米粒子和C层之间的协同作用.

Hydrogen evolution reaction（HER）based on water electrolysis is promising pathways for sustainable hydrogen production,in which an important task is developing with the advontageous of low cost,high active and stable electrocatalysts.Herein,we report a CoP/Co_2P/C electrocatalyst as an efficient and stable HER electrocatalyst over the whole pH range（from 0 to 14）,which has been prepared by one-step annealing the precursors containing phytic acid and cobalt salts.Such catalyst requires an overpotential of 135 mV to achieve a current density of 10 mA/cm^2 in 0.5 mol/L H_2SO_4.In1 mol/L KOH and 0.1 mol/L PBS,it needs 141 and 155 mV to attain the current density of 10 mA/cm^2,respectively.The excellent HER performance of CoP/Co_2P/C could be attributed to the synergistic effect between CoP/Co_2P and graphene-like carbon.