Constructing bifunctional Fe7S8/CoS heterostructures for efficient water electrolysis
International Journal of Hydrogen Energy(2023)
摘要
Pyrrhotite Fe7S8 has inferior catalytic performance in electrochemical water splitting due to its poor electrical conductivity. The construction of interface-type materials results in exposing more active sites, in turn, boosting the conductivity and electrochemical activity. Herein, we successfully fabricate Fe7S8/CoS heterostructures to mediate the reactivity in water electrolysis. The formation of heterointerfaces between Fe7S8 and CoS is confirmed by structural characterization. The as-prepared Fe7S8/CoS heterostructures exhibit remarkable activity in water oxidation reaction with 241 mV at 10 mA/cm2, superior to RuO2. Compared with Fe7S8, the heterointerfaces in Fe7S8/CoS heterostructures significantly enhance water reduction reaction activity. Moreover, Fe7S8/CoS heterostructures require 1.68 V to reach 10 mA/cm2 in water electrolysis reaction, which outperforms most the reported Fe7S8-based materials. The interface structures between Co-S and Fe-S provide the rich active sites and accelerate the electron diffusion rate, resulting in the
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关键词
Pyrrhotite,Heterostructures,Water electrolysis,CoS
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