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Hatted 1T/2H‐Phase MoS 2 on Ni 3 S 2 Nanorods for Efficient Overall Water Splitting in Alkaline Media
Author(s) -
Zhao Yang,
Wei Shizhong,
Wang Feihong,
Xu Liujie,
Liu Yong,
Lin Junpin,
Pan Kunming,
Pang Huan
Publication year - 2020
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201904307
Subject(s) - tafel equation , overpotential , water splitting , electrocatalyst , materials science , nanorod , electrolyte , bifunctional , chemical engineering , catalysis , phase (matter) , inorganic chemistry , intercalation (chemistry) , electrochemistry , nanotechnology , chemistry , electrode , photocatalysis , biochemistry , organic chemistry , engineering
A new hatted 1T/2H‐phase MoS 2 on Ni 3 S 2 nanorods, as a bifunctional electrocatalyst for overall water splitting in alkaline media, is prepared through a simple one‐pot hydrothermal synthesis. The hat‐rod structure is composed mainly of Ni 3 S 2 , with 1T/2H‐MoS 2 adhered to the top of the growth. Aqueous ammonia plays an important role in forming the 1T‐phase MoS 2 by twisting the 2H‐phase transition and expanding the interlayer spacing through the intercalation of NH 3 /NH 4 + . Owing to the special “hat‐like” structure, the electrons conduct easily from Ni foam along Ni 3 S 2 to MoS 2 , and the catalyst particles maintain sufficient contact with the electrolyte, with gaseous molecules produced by water splitting easily removed from the surface of the catalyst. Thus, the electrocatalytic performance is enhanced, with an overpotential of 73 mV, a Tafel slope of 79 mV dec −1 , and excellent stability, and the OER demonstrates an overpotential of 190 mV and Tafel slope of 166 mV dec −1 .