石墨烯/CuCo2O4固载Pd-Bi纳米粒子的制备及其电催化氧化乙二醇  

Preparation and electrocatalytic oxidation of ethylene glycol on Pd-Bi nanoparticles fixed on graphene/CuCo 2O 4 composites

作　　者：杨婕妤 张淑娟 万正睿 刘红英[1] 张翊青 周立群[1] YANG Jieyu;ZHANG Shujuan;WAN Zhengrui;LIU Hongying;ZHANG Yiqing;ZHOU Liqun(Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, HubeiCollaborative Innovation Center for Advanced Organic Chemical Materials, College of Chemistry andChemical Engineering, Hubei University, Wuhan 430062, China)

机构地区：[1]湖北大学化学化工学院,有机化工新材料湖北省协同创新中心,有机功能分子合成与应用教育部重点实验室,湖北武汉430062

出　　处：《湖北大学学报（自然科学版）》2020年第4期440-448,共9页Journal of Hubei University：Natural Science

摘　　要：以氧化石墨烯(GO)、醋酸铜、醋酸钴为原料,采用溶剂热法成功地合成复合载体GO/CuCo2O4,再通过浸渍还原法成功地将Pd、Pd-Bi纳米粒子负载到GO/CuCo2O4载体上,并用于碱性介质中乙二醇(EG)的电催化氧化.实验结果表明,双金属催化剂PdBi@GO/CuCo2O4对乙二醇的电催化氧化具有最高的催化活性和稳定性,优于目前商用Pd/C和单Pd负载型催化剂,其正向峰电流密度达到122.7 mA·cm^-2,是商用Pd/C(29.57 mA·cm^-2)的4.1倍.这种优良的电催化性能归功于载体GO/CuCo2O4为双金属负载提供独特的骨架结构,以及Pd-Bi纳米粒子之间强烈的协同作用.而且,氧化石墨烯引入到CuCo2O4中有利于增强电子转移和增大接触面积,从而提高乙二醇的电催化氧化.这种新型催化剂的制备为发展高效Pd基电催化氧化直接醇类燃料电池提供新途径,具有较好的应用价值.Graphene oxide(GO),copper acetate and cobalt acetate as main raw materials,the composite carrier GO/CuCo2O4 was firstly synthesized by solvothermal method.Then,monometallic Pd and bimetallic Pd-Bi nanoparticles(NPs)were successfully fixed in the GO/CuCo2O4 by in situ impregnation-reduction method,which were used to the electrooxidation of ethylene glycol(EG)in an alkaline medium.The result shows that the bimetallic catalyst PdBi@rGO/CuCo2O4 exhibites the highest electrocatalytic activity and stability comparing with commercial Pd/C and single Pd loading catalysts as alcohol fuel cell anode catalyst,and its forword peakcurrent density is as high as 122.7 mA·cm^-2,which is about 4.1 times higher than that of commercial Pd/C(29.57 mA·cm^-2).The outstanding electrocatalysis oxidation performance of the PdBi@rGO/CuCo2O4 is attributed to the unique support structure for bimetallic PdBi loading and strong synergistic effects of Pd-Bi NPs.Furthermore,the introduction of GO in CuCo2O4 matrix conduces to the superior electron transfer and large surface area,which are beneficial to improve the catalytic ability of EG electrooxidation.The study on the new catalyst offers a conception and applicable way to develop the advanced Pd-based electrocatalysts for high performance direct alcohol fuel cells.

关 键 词：CuCo2O4 氧化石墨烯 Pd-Bi纳米粒子 电催化 乙二醇 

分 类 号：O643.3[理学—物理化学]