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- Title
Surface‐Activated Amorphous Iron Borides (Fe<sub>x</sub>B) as Efficient Electrocatalysts for Oxygen Evolution Reaction.
- Authors
Wang, Lincai; Li, Jiaxuan; Zhao, Xiangsen; Hao, Weiju; Ma, Xiaohua; Li, Shengji; Guo, Yanhui
- Abstract
The development of efficient and earth‐abundant water‐splitting electrocatalysts is of great importance for energy conversion and storage technologies. In this study, surface‐activated amorphous FexB catalysts, Fe–B–O@Fe2B and Fe–B–O@FeB2, are synthesized and remarkable activity for the oxygen evolution reaction (OER) is achieved, e.g., Fe–B–O@FeB2 delivering a current density of 10 mA cm−2 at overpotential of 260 mV with Tafel slope of 57.9 mV dec−1 for OER in alkaline electrolyte. Iron oxide/hydroxide and oxidized borate species on the surface of FexB are found to have a synergistic effect on promoting the OER activity of the sample. Moreover, it is found that the OER active oxidization layer of iron boride is less active toward hydrogen evolution reaction. Surface‐activated amorphous iron borides (FexB) are efficient electrocatalysts for the oxygen evolution reaction (OER). Fe–B–O@FeB2 delivered 10 mA cm−2 at overpotential of 260 mV in alkaline electrolyte. Metal oxide/hydroxide and oxidized borate species is responsible for the OER activity of the products. The OER active oxidization layer of FexB is less active toward the hydrogen evolution reaction.
- Subjects
OXYGEN evolution reactions; HYDROGEN evolution reactions; ELECTROCATALYSTS; BORIDES; ATOMIC hydrogen; METALLIC oxides
- Publication
Advanced Materials Interfaces, 2019, Vol 6, Issue 6, pN.PAG
- ISSN
2196-7350
- Publication type
Article
- DOI
10.1002/admi.201801690