碳负载氮掺杂纳米碳化钨电催化剂的制备及析氢性能  

Preparation and Hydrogen Evolution Performance of Carbon-supported Nitrogen-doped Nano Tungsten Carbide Electrocatalyst

作　　者：闫朋朋 苏伟 韦小凤[1] 朱学卫[1] 王府 YAN Pengpeng;SU Wei;WEI Xiaofeng;ZHU Xuewei;WANG Fu(School of Mechanical and Electrical Engineering,Northwest A&F University,Yangling 712100,China;School of Physics and Electronic Sciences,Zunyi Normal University,Zunyi 563000,China)

机构地区：[1]西北农林科技大学机械与电子工程学院,杨陵712100 [2]遵义师范学院物理与电子科学学院,遵义563000

出　　处：《材料导报》2021年第14期14007-14011,共5页Materials Reports

基　　金：陕西省自然科学基础研究计划(2019JQ-584);国家自然科学基金(51764017)。

摘　　要：碳化钨(WC)是高成本和资源稀缺铂基催化剂的优良替代品。以偏钨酸铵(AMT)、葡萄糖(C_(6)H_(12)O_(6))和二氰二胺(DCDA)为W、C和N源,采用简易的NaCl/KCl熔融盐一步碳化法制备碳负载氮(N)掺杂WC@NC纳米晶粒。利用XRD、SEM、TEM、XPS、电化学工作站对催化剂的物相、形貌及电催化析氢性能进行表征。结果表明,WC@NC由碳片和WC组成,颗粒分布均匀,纳米颗粒平均直径为10~30 nm。WC@NC在0.5 mol/L H_(2)SO_(4)电解液中电流密度为10 mA/cm^(2)的过电位是132 mV,塔菲尔斜率为64.2 mV/dec。经过5000次循环伏安测试和25 h持续电解析氢测试后,线性扫描伏安(LSV)曲线和电流密度均无明显变化,表现出非常高的稳定性。Tungsten carbide(WC)is an alternative to the costly and resource-constrained Pt-based catalysts.Herein,ammonium metatungstate(AMT),glucose(C_(6)H_(12)O_(6))and dicyandiamide(DCDA)were used as W,C and N sources.A one-step facile and easily scalable approach is reported to synthesize ultrafine WC nanocrystals supported on N-doped carbon nanosheets(NC)by molten salt.The morphology,composition and phases were characterized by SEM,TEM,XRD and XPS.Moreover,the HER performance of the catalysts in 0.5 mol/L H_(2)SO_(4) was determined.The results showed that WC@NC is composed of carbon sheet and WC with uniform particle distribution.The average diameter of nanoparticles is 10—30 nm.As a result,WC@NC demonstrates remarkable hydrogen evolution reaction(HER)electrocatalytic performance with overpotentials of 132 mV at a current density of 10 mA/cm^(2) and Tafel slope of 64.2 mV/dec in acid media,respectively.Moreover,catalysts exhibited remarkable stability during 5000 times cycles cyclic voltammetry(CV)sweeps and 25 h testing at the fixed overpotential.

关 键 词：熔融盐 氮掺杂碳化钨 电解水 析氢反应(HER) 

分 类 号：TQ116[化学工程—无机化工]