能源化学(英文) ›› 2017, Vol. 26 ›› Issue (6): 1153-1159.DOI: 10.1016/j.jechem.2017.06.007

• Articles • 上一篇    下一篇

Polyethyleneimine modified AuPd@PdAu alloy nanocrystals as advanced electrocatalysts towards the oxygen reduction reaction

Qi Xue, Guangrui Xu, Rundong Mao, Huimin Liu, Jinghui Zeng, Jiaxing Jiang, Yu Chen   

  1. Key Laboratory of Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, China
  • 收稿日期:2017-05-13 修回日期:2017-06-27 出版日期:2017-11-15 发布日期:2017-11-24
  • 通讯作者: Yu Chen,E-mail address:ndchenyu@gmail.com
  • 基金资助:

    This research was sponsored by the National Natural Science Foundation of China (21473111) and Fundamental Research Funds for the Central Universities (GK201602002 and GK201701007).

Polyethyleneimine modified AuPd@PdAu alloy nanocrystals as advanced electrocatalysts towards the oxygen reduction reaction

Qi Xue, Guangrui Xu, Rundong Mao, Huimin Liu, Jinghui Zeng, Jiaxing Jiang, Yu Chen   

  1. Key Laboratory of Macromolecular Science of Shaanxi Province, Shaanxi Key Laboratory for Advanced Energy Devices, Shaanxi Engineering Lab for Advanced Energy Technology, School of Materials Science and Engineering, Shaanxi Normal University, Xi'an 710062, Shaanxi, China
  • Received:2017-05-13 Revised:2017-06-27 Online:2017-11-15 Published:2017-11-24
  • Contact: Yu Chen,E-mail address:ndchenyu@gmail.com
  • Supported by:

    This research was sponsored by the National Natural Science Foundation of China (21473111) and Fundamental Research Funds for the Central Universities (GK201602002 and GK201701007).

摘要: Designing the low cost, active, durable, and alcohol-tolerant cathode catalysts towards the oxygen reduction reaction (ORR) is significant for the large-scale commercialization of direct alcohol fuel cells. Recently, Pd-based nanocrystals have attracted attention as Pt-alternative cathode catalysts towards the ORR in the alkaline electrolyte. Unfortunately, the pristine Pd-based nanocrystals lack the selectivity towards the ORR due to their inherent activity for the alcohol molecule oxidation reaction in the alkaline electrolyte. In this work, polyethyleneimine (PEI) modified AuPd alloy nanocrystals with Au-rich AuPd alloy cores and Pd-rich PdAu alloy shells (AuPd@PdAu-PEI) are successfully synthesized using a traditional chemical reduction method in presence of PEI. The rotating disk electrode (RDE) technique is applied to evaluate the ORR performance of AuPd@PdAu-PEI nanocrystals. Compared with commercial Pd black, AuPd@PdAu-PEI nanocrystals show significantly enhanced activity and durability towards the ORR, and simultaneously exhibit particular alcohol tolerance towards the ORR in the alkaline electrolyte.

关键词: Fuel cells, PdAu alloy, Surface modification, Oxygen reduction reaction, Alcohol tolerance

Abstract: Designing the low cost, active, durable, and alcohol-tolerant cathode catalysts towards the oxygen reduction reaction (ORR) is significant for the large-scale commercialization of direct alcohol fuel cells. Recently, Pd-based nanocrystals have attracted attention as Pt-alternative cathode catalysts towards the ORR in the alkaline electrolyte. Unfortunately, the pristine Pd-based nanocrystals lack the selectivity towards the ORR due to their inherent activity for the alcohol molecule oxidation reaction in the alkaline electrolyte. In this work, polyethyleneimine (PEI) modified AuPd alloy nanocrystals with Au-rich AuPd alloy cores and Pd-rich PdAu alloy shells (AuPd@PdAu-PEI) are successfully synthesized using a traditional chemical reduction method in presence of PEI. The rotating disk electrode (RDE) technique is applied to evaluate the ORR performance of AuPd@PdAu-PEI nanocrystals. Compared with commercial Pd black, AuPd@PdAu-PEI nanocrystals show significantly enhanced activity and durability towards the ORR, and simultaneously exhibit particular alcohol tolerance towards the ORR in the alkaline electrolyte.

Key words: Fuel cells, PdAu alloy, Surface modification, Oxygen reduction reaction, Alcohol tolerance