Tuning oxygen reduction reaction activity via structure orientation and surface arrangement: A study on ordered PtCo/C catalysts

作者：Zhong, Huichi; Wu, Hao; Pan, Yingzhi; Li, Huibin; Peng, Ye; Banham, Dustin^*; Zeng, Jianhuang^*

来源：International Journal of Hydrogen Energy, 2022, 47(97): 40952-40960.

DOI：10.1016/j.ijhydene.2022.09.177

• Pt-based alloy
• Structurally ordered
• Oxygen reduction reaction
• Pt-skin

A facile and general strategy for the preparation of highly dispersed PtCo/C catalysts with a Pt-enriched surface is reported. The thermal treatment of the PtCo/C catalyst changes the structure orientation from disordered to ordered phase. Ordered PtCo/C intermetallic catalyst exhibits significantly enhanced electrocatalytic activity and durability toward oxygen reduction reaction (ORR) compared with its disordered counterpart and commer-cially available PtCo/C, with a mass activity and specific activity of 0.68 A mg Pt-1@0.90 V and 1.15 mA cm-2, respectively. In addition, the mass activity only decreased by 25.1% after 30,000 potential cycles from 0.60 to 1.00 V at a scan rate of 100 mV s-1. Therefore, the improved ORR activity and stability can be ascribed to the atomic ordered surface arrangement and reasonable surface compress strain originated from Pt-enriched surface.

• 单位
  佛山科学技术学院