摘要
利用多孔碳(C)的限域作用制备了铌(Nb)氧化物-碳复合载体负载铂(Pt)作为氧还原反应电催化剂.该实验在多孔碳中形成铌氧化物和单质铜(Cu)的混合物(NbO_(x)C@Cu),并以此作为载体,通过金属铜置换铂离子最终形成多孔碳/铌氧化物负载铂催化剂(NbO_(x)C@Pt),并进一步探究了该催化剂对氧还原反应的催化性能.结果表明:所制备的NbO_(x)C@Pt催化剂表现出优异的氧还原性能,其半波电位为878 mV,比活性为0.49 m·A·cm^(-2),明显高于商业Pt/C催化剂.此外,该实验还发现在氢氩混合气中预处理样品可以明显提高催化剂的稳定性.该实验将新型结构的多孔碳/铌氧化物作为载体应用到电化学实验教学中,能开拓学生对电催化基础材料科学的认知.
An experiment using the confinement effect of porous carbon(C)is designed to prepare niobium(Nb)oxide/carbon composite-supported platinum(Pt)as an electrocatalyst for oxygen reduction reaction.Nb oxide/carbon supported copper(Cu)(NbOxC@Cu)is first prepared and platinum cations are reduced and deposited by a replacement reaction with copper to prepare Nb oxide/carbon-supported Pt electrocatalyst(NbOxC@Pt).The results indicate that the as-prepared NbOxC@Pt electrocatalyst exhibits excellent oxygen-reduction performance with a half-wave potential of 878 mV and a specific activity of 0.49 m·A·cm^(-2),which is significantly higher than that of commercial Pt/C electrocatalyst.In addition,this experiment also finds out that the pre-treatment in the hydrogen/argon mixed atmosphere can significantly improve the stability of the electrocatalyst.This experiment applies porous carbon/Nb oxide as a novel support for electrochemistry experimental teaching,which can broad students’understanding of electrocatalytic basic materials.
作者
殷洁炜
李琳
YIN Jiewei;LI Lin(School of Mechanical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;School of Chemistry and Chemical Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)
基金
2022年度上海交通大学决策咨询课题(JCZXSJB2022-25)。
关键词
氧还原反应
限域效应
铂(Pt)基电催化剂
实验设计
稳定性
oxygen reduction reaction
confinement effect
platinum(Pt)-based electrocatalysts
experimental design
stability
