Efficient Hydrogen Evolution Reaction Catalysis in Alkaline Media by All-in-One MoS 2 with Multifunctional Active Sites.

Autor: Anjum MAR; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea., Jeong HY; UNIST Central Research Facilities, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea., Lee MH; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea., Shin HS; Department of Chemistry and Department of Energy Engineering, Low Dimensional Carbon Materials Center, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea., Lee JS; School of Energy and Chemical Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Ulsan, 44919, South Korea.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2018 May; Vol. 30 (20), pp. e1707105. Date of Electronic Publication: 2018 Mar 30.
DOI: 10.1002/adma.201707105
Abstrakt: 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.
(© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
Externí odkaz: