Premium
Efficient Hydrogen Evolution Reaction Catalysis in Alkaline Media by All‐in‐One MoS 2 with Multifunctional Active Sites
Author(s) -
Anjum Mohsin Ali Raza,
Jeong Hu Young,
Lee Min Hee,
Shin Hyeon Suk,
Lee Jae Sung
Publication year - 2018
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201707105
Subject(s) - catalysis , intercalation (chemistry) , materials science , electrocatalyst , active site , water splitting , metal , hydrogen , nickel , phase (matter) , chemical engineering , inorganic chemistry , nanotechnology , electrochemistry , electrode , photocatalysis , chemistry , metallurgy , organic chemistry , engineering
MoS 2 becomes an efficient and durable nonprecious‐metal electrocatalyst for the hydrogen evolution reaction (HER) when it contains multifunctional active sites for water splitting derived from 1T‐phase, defects, S vacancies, exposed Mo edges with expanded interlayer spacings. In contrast to previously reported MoS 2 ‐based catalysts targeting only a single or few of these characteristics, the all‐in‐one MoS 2 catalyst prepared herein features all of the above active site types. During synthesis, the intercalation of in situ generated NH 3 molecules into MoS 2 sheets affords ammoniated MoS 2 (A‐MoS 2 ) that predominantly comprises 1T‐MoS 2 and exhibits an expanded interlayer spacing. The subsequent reduction of A‐MoS 2 results in the removal of intercalated NH 3 and H 2 S to form an all‐in‐one MoS 2 with multifunctional active sites mentioned above (R‐MoS 2 ) that exhibits electrocatalytic HER performance in alkaline media superior to those of all previously reported MoS 2 ‐based electrocatalysts. In particular, a hybrid MoS 2 /nickel foam catalyst outperforms commercial Pt/C in the practically meaningful high‐current region (>25 mA cm −2 ), demonstrating that R‐MoS 2 ‐based materials can potentially replace Pt catalysts in practical alkaline HER systems.