铂钴合金纳米电催化剂的制备及性能研究  

Synthesis and Property of Platinum-cobalt Alloy Nano Catalyst

作　　者：朱勇 顾军[1,2] 于涛 何海佟[1] 姚睿 ZHU Yong;GU Jun;YU Tao;HE Haitong;YAO Rui(College of Physics,Nanjing University,Nanjing 210093,China;Nanjing Doinpower Technology Co.,Ltd.,Nanjing 211135,China;National Laboratory of Solid-State Microstructures,Nanjing University,Nanjing 210093,China)

机构地区：[1]南京大学物理学院,南京210093 [2]南京东焱氢能源科技有限公司,南京211100 [3]南京大学固体微结构物理国家重点实验室,南京210093

出　　处：《无机材料学报》2021年第3期299-305,I0001,I0002,共9页Journal of Inorganic Materials

基　　金：中央高校基本科研业务费专项资金(14380168)。

摘　　要：研制高活性的电催化剂是实现质子交换膜燃料电池的商业化应用必须解决的关键技术之一。本研究以三乙胺为碱性络合剂、硼氢化钠为还原剂,采用液相合成法制备PtCo纳米合金电催化剂,再通过高温热处理实现最佳电化学性能。采用各种表征方法对催化剂的微观结构及电化学性能进行测定,探究硼氢化钠、三乙胺的添加量及高温热处理对催化剂电化学性能的影响。结果显示,适量的硼氢化钠可提升催化剂的电化学活性面积,三乙胺可以改变催化剂的质量活性,高温热处理能有效提升催化剂的质量活性,极大提升催化剂的氧还原反应(ORR)能力;在同一测试体系下,添加100 mg硼氢化钠及100μL三乙胺在500℃高温热处理条件下制备的PtCo纳米合金电催化剂的质量活性达到133 mA/mgPt,是田中贵金属工业株式会社(TKK)商用PtCo合金催化剂的3倍。In order to achieve the commercialization of proton exchange membrane fuel cells(PEMFCs),it is necessary to synthesize electrocatalyst with higher electrochemical activity.In this study,PtCo nano-alloy electrocatalyst was prepared by liquid phase synthesis method with sodium borohydride as reducing agent,triethylamine as complexing agent,and by sequential heat-treatment.The physical properties of the catalyst were characterized by different analytical methods.We studied the effects of heat-treatment temperature,different amounts of sodium borohydride and triethylamine on electrochemical performance.The results show that heat-treatment can greatly improve the mass activity of the catalyst,and 500℃is the optimal temperature for preparing the catalyst with the highest catalytic performance towards oxygen reduction reaction(ORR).Compared with commercial TKK-PtCo alloy catalyst under the same test system,the as-prepared catalysts exhibits advantages of more uniform particle size distribution,smaller particle size and higher electrochemical performance.In particular,the mass activity(MA)of the prepared catalyst is 133 mA/mgPt,which is 3 times of TKK-PtCo alloy catalyst.

关 键 词：电催化剂 PtCo合金 高温热处理 氧还原反应 电化学活性面积 

分 类 号：O646[理学—物理化学]