Understanding the improvement mechanism of plasma etching treatment on oxygen reduction reaction catalysts

Peng Rao, Yanhui Yu, Shaolei Wang, Yu Zhou, Xiao Wu, Ke Li, Anyuan Qi, Peilin Deng, Yonggang Cheng, Jing Li, Zhengpei Miao, Xinlong Tian
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Abstract

Plasma etching treatment is an effective strategy to improve the electrocatalytic activity, but the improvement mechanism is still unclear. In this work, a nitrogen-doped carbon nanotube-encased iron nanoparticles (Fe@NCNT) catalyst is synthesized as the model catalyst, followed by plasma etching treatment with different parameters. The electrocatalytic activity improvement mechanism of the plasma etching treatment is revealed by combining the physicochemical characterizations and electrochemical results. As a result, highly active metal–nitrogen species introduced by nitrogen plasma etching treatment are recognized as the main contribution to the improved electrocatalytic activity, and the defects induced by plasma etching treatment also contribute to the improvement of the electrocatalytic activity. In addition, the prepared catalyst also demonstrates superior ORR activity and stability than the commercial Pt/C catalyst.

Abstract Image

了解等离子蚀刻处理对氧还原反应催化剂的改进机理
等离子体刻蚀处理是提高电催化活性的一种有效策略,但其改进机理尚不清楚。本研究以氮掺杂碳纳米管包覆铁纳米颗粒(Fe@NCNT)催化剂为模型,合成了等离子体刻蚀催化剂,并对其进行了不同参数的刻蚀处理。结合物理化学表征和电化学结果,揭示了等离子刻蚀处理提高电催化活性的机理。结果表明,氮等离子刻蚀处理引入的高活性金属氮物种是提高电催化活性的主要原因,等离子刻蚀处理诱导的缺陷也有助于提高电催化活性。此外,所制备的催化剂在 ORR 活性和稳定性方面也优于商用 Pt/C 催化剂。
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