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Surface‐Activated Amorphous Iron Borides (Fe x B) as Efficient Electrocatalysts for Oxygen Evolution Reaction
Author(s) -
Wang Lincai,
Li Jiaxuan,
Zhao Xiangsen,
Hao Weiju,
Ma Xiaohua,
Li Shengji,
Guo Yanhui
Publication year - 2019
Publication title -
advanced materials interfaces
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.671
H-Index - 65
ISSN - 2196-7350
DOI - 10.1002/admi.201801690
Subject(s) - overpotential , oxygen evolution , tafel equation , materials science , catalysis , water splitting , amorphous solid , electrolyte , inorganic chemistry , boride , hydroxide , boron , chemical engineering , metallurgy , electrochemistry , chemistry , electrode , crystallography , biochemistry , organic chemistry , photocatalysis , engineering
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 Fe x B catalysts, Fe–B–O@Fe 2 B and Fe–B–O@FeB 2 , are synthesized and remarkable activity for the oxygen evolution reaction (OER) is achieved, e.g., Fe–B–O@FeB 2 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 Fe x B 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.