氮化铌电催化还原CO_2（英文）

Niobium Nitride Catalyst for Electrocatalytic Reduction of CO_2

通过电化学的方法将CO_2转化为CO是解决资源和环境问题的经济友好的策略。在本次工作中,利用湿化学方法制备了铌/碳的前驱体,在NH_3和Ar氛围下煅烧后分别转化为Nb_4N_5/C和Nb_2O_5/C。当氮化温度达到700℃时,制备的Nb_4N_5/C表现出优异的催化活性,在CO_2饱和的0.5 mol·L^(-1)的NaCl溶液中,电解电位为-0.83V(RHE)时,CO的法拉第效率最高,达到57%。实验结果表明,Nb_4N_5/C的催化活性与Nb_4N_5中的N掺杂有关。

Converting CO2 to CO by electrochemical method is considered as an economic and friendly strategy to solve problems of resource and environment. In this work, precursor of niobium/carbon was prepared by wet chemical method and converted into Nb 4N 5/C and Nb 2O 5/C after calcination under NH 3 and Ar respectively. When the nitriding temperature reaches to 700 ℃, prepared Nb 4N 5/C exhibits excellent catalytic activity with CO Faradaic efficiency of 57% at -0.83 V vs RHE in CO 2 saturated 0.5 mol·L^-1 NaCl solution. The results show that the catalytic activity of Nb 4N 5/C is related to the N doping in Nb 4N 5.