离子液体体系中石墨烯负载铜纳米粒子高效电催化氧还原反应  

Highly Efficient Oxygen Reduction Reaction Electrocatalyzed by Graphene Supported Cu Nanocomposite in Ionic Liquid System

作　　者：王娜 周尉[1] 徐斌 周利荣 成旦红[1] WANG Na;ZHOU Wei;XU Bin;ZHOU Lirong;CHENG Danhong(Department of Chemistry, Shanghai University, Shanghai 200444)

机构地区：[1]上海大学化学系,上海200444

出　　处：《复旦学报（自然科学版）》2021年第4期524-531,共8页Journal of Fudan University：Natural Science

基　　金：国家自然科学基金(21573144,21003088)。

摘　　要：通过一步还原法制备了还原氧化石墨烯纳米片负载的铜纳米粒子复合材料(CuNPs-rGO-20%,CuNPs-rGO-80%,CuNPs-rGO-120%),并利用循环伏安法分别在0.1 mol/L KOH水溶液和离子液体(Ionic Liquid,IL)1丁基3甲基咪唑四氟硼酸盐([Bmim]BF4)电解液中进行电化学测试来研究其对氧还原反应(Oxygen Reduction Reaction,ORR)的电催化效果.采用透射电镜(TEM)和X射线衍射仪(XRD)对所制备的纳米粒子催化剂进行表征.TEM和XRD结果表明,所制备的CuNPs-rGO-80%纳米粒子表面主要为Cu(111)晶面,平均粒径约为10 nm.电化学测试结果表明,与商业化Pt/C(质量浓度20%)催化剂相比,CuNPs-rGO-80%纳米催化剂在IL中具有优异的ORR电催化活性,ORR的起始电位更正,ORR峰电位正移150 mV,还原电流密度更大.The reduced graphene oxide(rGO) sheets-supported copper nanoparticles composite(CuNPs-rGO-20%,CuNPs-rGO-80 % and CuNPs-rGO-120 %) were prepared by the replacement reaction in an aqueous system,and the electrocatalytic activity toward oxygen reduction reaction(ORR) were studied by cyclic voltammetry(CV) in 0.1 mol/L KOH and ionic liquid(IL)-butyl-3-methylimidazolium tetrafluoroborate([Bmim] BF4).The nanocoomposites were characterized by transmission electron microscopy(TEM) and X-ray diffraction(XRD).TEM images as well as XRD results demonstrate that the CuNPs-rGO-80 % nanocoomposites are mainly featured with Cu(111) plane, with an average size of 10 nm.Cyclic voltammetry measurements demonstrate that the CuNPs-rGO-80 % nanocoomposites exhibit excellent electrocatalytic activity toward oxygen reduction reaction compared to commercial Pt/C material in ionic liquid,both the ORR onset potential and peak potential are more positive, as well as the ORR current density is largely enhanced than that of Pt/C(20%).

关 键 词：氧还原 铜纳米粒子 离子液体 还原氧化石墨烯 电催化 

分 类 号：O647.11[理学—物理化学]