1. Porous Fe5Si3 intermetallic anode for the oxygen evolution reaction in acidic electrolytes
- Author
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Botao Shen, Yao Jiang, Zhonghe Wang, Haiyan Gao, Zhenli He, and Yuehui He
- Subjects
Tafel equation ,Materials science ,Oxygen evolution ,Intermetallic ,Electrolyte ,Overpotential ,Electrochemistry ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Anode ,Catalysis ,Biomaterials ,Colloid and Surface Chemistry ,Chemical engineering - Abstract
Here, we show that a reactive synthesis method of mixed elemental powders can be used to synthesize a porous electrode consisting of an intermetallic Fe5Si3 that exhibits catalytic activity towards oxygen evolution reaction (OER) in acidic solutions, which is capable of delivering 10 mA cm−2 at an overpotential of 0.73 V and a small Tafel slope of ~ 381.8 mV dec-1. The amorphous silica formed in the anode surface during the electrochemical process is multifunctional, as it protects the electrode substrate from corrosion and acts as electrocatalysts for OER. Remarkably, the Si-based intermetallics can be generalized to include other OER catalytic elements (Mn, Fe, Co), including Mn-Si and Co-Si intermetallics.
- Published
- 2022
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