Ni(OH)2 Derived from NiS2 Induced by Reflux Playing Three Roles for Hydrogen/oxygen Evolution Reaction
Sheng-Jun Xu*, Ya-Nan Zhou, Guo-Ping Shen and Bin Dong* Submit a Manuscript
Ni(OH)2 Derived from NiS2 Induced by Reflux Playing Three Roles for Hydrogen/oxygen Evolution Reaction
Sheng-Jun Xu*, Ya-Nan Zhou, Guo-Ping Shen and Bin Dong*
Chin. J. Struct. Chem. 2022, 41, 2208052-2208057 DOI: 10.14102/j.cnki.0254-5861.2022-0143
July 25, 2022
Ni(OH)2, NiS2, heterostructures, oxygen evolution reaction, hydrogen evolution reaction
ABSTRACT
Developing efficient and
promising non-noble catalysts for oxygen evolution reaction
(OER) and hydrogen evolution reaction (HER) is vital but still a huge challenge
for the clean energy system. Herein, we have integrated the active components
for OER (Ni(OH)2) and HER (NiS2 and Ni(OH)2)
into Ni(OH)2@NiS2 heterostructures by a facile reflux
method. The in-situ formed Ni(OH)2 thin layer is coated on the
surface of hollow NiS2 nanosphere. The uniform Ni(OH)2@NiS2 hollow sphere processes enlarge the electrochemically active specific surface
area and enhance the intrinsic activity compared to NiS2 precursor,
which affords a current density of 10 mA cm-2 at the overpotential
of 309 mV and 100 mA cm-2 at 359 mV for OER. Meanwhile, Ni(OH)2@NiS2 can reach 10 mA cm-2 at 233 mV for HER, superior to pure NiS2.
The enhanced performance can be attributed to the synergy between Ni(OH)2 and NiS2. Specifically, Ni(OH)2 has three
functions for water splitting: providing active sites for hydrogen adsorption
and hydroxyl group desorption and working as real OER active sites. Moreover,
Ni(OH)2@NiS2 displays great
stability for OER (50 h) and HER (30 h).
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