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From a Molecular 2Fe‐2Se Precursor to a Highly Efficient Iron Diselenide Electrocatalyst for Overall Water Splitting
Author(s) -
Panda Chakadola,
Menezes Prashanth W.,
Walter Carsten,
Yao Shenglai,
Miehlich Matthias E.,
Gutkin Vitaly,
Meyer Karsten,
Driess Matthias
Publication year - 2017
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201706196
Subject(s) - electrocatalyst , overpotential , oxygen evolution , water splitting , bifunctional , selenide , diselenide , catalysis , chemical engineering , materials science , inorganic chemistry , electrode , nickel , chemistry , electrochemistry , metallurgy , organic chemistry , photocatalysis , selenium , engineering
A highly active FeSe 2 electrocatalyst for durable overall water splitting was prepared from a molecular 2Fe‐2Se precursor. The as‐synthesized FeSe 2 was electrophoretically deposited on nickel foam and applied to the oxygen and hydrogen evolution reactions (OER and HER, respectively) in alkaline media. When used as an oxygen‐evolution electrode, a low 245 mV overpotential was achieved at a current density of 10 mA cm −2 , representing outstanding catalytic activity and stability because of Fe(OH) 2 /FeOOH active sites formed at the surface of FeSe 2 . Remarkably, the system is also favorable for the HER. Moreover, an overall water‐splitting setup was fabricated using a two‐electrode cell, which displayed a low cell voltage and high stability. In summary, the first iron selenide material is reported that can be used as a bifunctional electrocatalyst for the OER and HER, as well as overall water splitting.