介孔炭负载铂纳米粒子的高效氧还原催化剂的可控设计  

Controllability Design of High Performance Oxygen Reduction Catalysts Supported by Platinum Nanoparticles Loaded on Mesoporous Carbon

作　　者：李宫 金龙一[1] 姚鹏飞 刘聪 徐维林[2,3] LI Gong;JIN Long-Yi;YAO Peng-Fei;LIU Cong;XU Wei-Lin(Department of Chemistry,Yanbian University,Yanji 133000,China;State Key Laboratory of Electroanalytical Chemistry and Jilin Province Key Laboratory of Low Carbon Chemical Power,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China;University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]延边大学化学系,延吉133000 [2]中国科学院长春应用化学研究所,电分析化学国家重点实验室&吉林省先进低碳化学电源重点实验室,长春130022 [3]中国科学技术大学,合肥230026

出　　处：《应用化学》2021年第12期1639-1646,共8页Chinese Journal of Applied Chemistry

基　　金：科技部重点研发项目(No.2017YFE0197900);国家自然科学基金(Nos.21925205,22072145,22005294,21633008)资助。

摘　　要：研制高效的氧还原催化剂对推动燃料电池的发展具有十分重要的意义,本研究利用水热法处理得到的富含缺陷的介孔炭材料为前驱体制备了介孔炭负载铂纳米粒子的高效氧还原催化剂Pt/BP_(a)(a表示酸处理),并对其进行成分和形貌结构表征。在酸性电解质中,该催化剂表现出良好的电催化氧还原反应(ORR)活性(半波电势为0.829 V)和稳定性(10000圈CV测试后其半波电势仅下降9 mV),优于商业Pt/C催化剂的催化效果和稳定性。通过对反应机理的解析发现,Pt/BP_(a)催化ORR的电子转移数为3.98,H_(2)O_(2)产率均低于5%,此类介孔碳负载铂纳米粒子的催化剂在未来燃料电池领域有着很大的应用前景。A carbon black-supported cost-effective carrier,the mesoporous carbon precursors with a lot of defects,were prepared by the hydrothermal method.After adding chloroplatinic acid and calcining at high temperature,the oxygen reduction catalyst of mesoporous carbon materials loaded with platinum nanoparticles was obtained.The composition and morphology of the prepared catalyst were characterized by a series of test methods.Combined with the activity and stability of the catalyst in the electrocatalytic oxygen reduction reaction(ORR)in acidic electrolyte,the potential law of oxygen defect on carbon materials and the electrochemical properties of the material itself was explored.The half-wave potential of Pt/BP_(a)(a stands for acid treatment)catalyst prepared under acidic condition is 0.829 V.After 10000 circles of the CV test,the half-wave potential decreases by 0.009 V,showing that the catalytic effect and stability are better than that of commercial Pt/C catalyst in the voltage range of 0.3~0.8 V.The electron transfer number of ORR with Pt/BP_(a) catalyst is approximately 3.98 and the intermediate product yields of H_(2)O_(2) are all lower than 5%.It is further proved that the Pt/BP;catalyst is in an effective four-electron process during the oxygen reduction reaction,is expected to be a commercial alternative to Pt/C,and also has great application prospect in the future fuel cell field.

关 键 词：介孔碳材料 缺陷 铂基催化剂 氧还原反应 燃料电池 高活性 

分 类 号：O643[理学—物理化学]