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Deep Eutectic Solvent‐Mediated Construction of Oxygen Vacancy‐Rich Fe‐Based Electrocatalysts for Efficient Oxygen Evolution Reaction
Author(s) -
Liu Shuai,
Chen Tingting,
Ying Hao,
Li Zhonghao,
Hao Jingcheng
Publication year - 2020
Publication title -
advanced sustainable systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.499
H-Index - 24
ISSN - 2366-7486
DOI - 10.1002/adsu.202000038
Subject(s) - oxygen evolution , overpotential , nanosheet , electrocatalyst , tafel equation , catalysis , materials science , chemical engineering , oxygen , vacancy defect , water splitting , inorganic chemistry , nanotechnology , chemistry , electrochemistry , crystallography , electrode , organic chemistry , engineering , photocatalysis
Fe‐based catalysts are promising candidates for water splitting due to the abundant reserves of Fe. However, their electrocatalytic performance toward the oxygen evolution reaction (OER) is still unsatisfactory. Herein, a new hybrid catalyst of Fe 7 S 8 /Fe 2 O 3 is designed via a deep eutectic solvent (DES)‐based strategy. The Fe 7 S 8 /Fe 2 O 3 particles are in a porous nanosheet structure and possess oxygen vacancy‐rich characteristics. The porous nanosheet structure and oxygen vacancy‐rich Fe 2 O 3 in the Fe 7 S 8 /Fe 2 O 3 significantly improves the electrocatalytic activity toward the OER. The as‐prepared Fe 7 S 8 /Fe 2 O 3 nanosheets demonstrate a small overpotential of 229 mV at a current density of 10 mA cm −2 with a small Tafel slope of 49 mV dec −1 , which outperform most of the state‐of‐the‐art Fe‐based catalysts. This work not only reports a new Fe‐based electrocatalyst with an improved performance toward the OER but also provides a rational DES‐based strategy for construction of advanced catalysts.