Details

Autor(en) / Beteiligte

• Xu, Qiucheng
• Jiang, Hao
• Duan, Xuezhi
• Jiang, Zheng
• Hu, Yanjie
• Boettcher, Shannon W
• Zhang, Weiyu
• Guo, Shaojun
• Li, Chunzhong

Titel

Fluorination-enabled Reconstruction of NiFe Electrocatalysts for Efficient Water Oxidation

Ist Teil von

• Nano letters, 2021-01, Vol.21 (1), p.492-499

Ort / Verlag

United States

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Developing low-cost and efficient electrocatalysts to accelerate oxygen evolution reaction (OER) kinetics is vital for water and carbon-dioxide electrolyzers. The fastest-known water oxidation catalyst, Ni(Fe)O H , usually produced through an electrochemical reconstruction of precatalysts under alkaline condition, has received substantial attention. However, the reconstruction in the reported catalysts usually leads to a limited active layer and poorly controlled Fe-activated sites. Here, we demonstrate a new electrochemistry-driven F-enabled surface-reconstruction strategy for converting the ultrathin NiFeO F nanosheets into an Fe-enriched Ni(Fe)O H phase. The activated electrocatalyst shows a low OER overpotential of 218 ± 5 mV at 10 mA cm and a low Tafel slope of 31 ± 4 mV dec , which is among the best for NiFe-based OER electrocatalysts. Such superior performance is caused by the effective formation of the Fe-enriched Ni(Fe)O H active-phase that is identified by Raman spectroscopy and the substantially improved surface wettability and gas-bubble-releasing behavior.