Fluorescence detection of hydroxyl radical generated from oxygen reduction on Fe/N/C catalyst

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2020,（2）
• 页码范围: 198-202
• 页数: 5页
• 语种: 英文

摘要

Pyrolyzed Fe/N/C catalyst has been considered as the most promising candidate to replace Pt for oxygen reduction reaction (ORR) in fuel cells.However,poor stability of Fe/N/C catalyst,mainly attributed to the oxidation corrosion by aggressive ·OH radical,severely hampers its applications.However,the exact mechanism for generation of ·OH is unclear yet.Herein,we developed a fluorescent method to effectively detect ·OH generated from ORR on Fe/N/C catalyst by using coumarin as a fluorescent probe.A great difference in potential dependence between ·OH and H2O2 generated from the ORR was observed,which suggests that ·OH is not generated from the decomposition of H2O2 as traditional viewpoint.