Edge-dominated hydrogen evolution reactions in ultra-narrow MoSinf2/inf nanoribbon arrays

0573967 - ÚFCH JH 2024 RIV GB eng J - Journal Article
Chen, D. R. - Muthu, J. - Guo, X. Y. - Chin, H. T. - Lin, Y. C. - Haider, Golam - Ting, Ch.-Ch. - Kalbáč, Martin - Hofmann, M. - Hsieh, Y.-P.
Edge-dominated hydrogen evolution reactions in ultra-narrow MoSinf2/inf nanoribbon arrays.
Journal of Materials Chemistry A. Roč. 11, č. 29 (2023), s. 15802-15810. ISSN 2050-7488. E-ISSN 2050-7496
R&D Projects: GA ČR(CZ) GX20-08633X
Institutional support: RVO:61388955
Keywords : graphene * monolayer * electrochemistry
OECD category: Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)
Impact factor: 11.9, year: 2022
Method of publishing: Limited access

Future energy generation and storage requirements emphasize the importance of high-performance electrocatalysis. MoS2 edges exhibit ideal energetics for hydrogen evolution reactions (HERs) if challenges in their kinetics are addressed. Herein, we investigate the emergence of edge-dominated electrochemical reaction kinetics in ultra-narrow MoS2 nanoribbons. A templated subtractive patterning process (TSPP) served as a powerful platform that yields large arrays of MoS2 nanoribbons. Nanoribbons with widths below 30 nm exhibit significantly increased reaction kinetics, as evidenced by a ∼200-fold enhanced turn-over frequency, an 18-fold increased exchange current density, and a 38% decreased Tafel slope. These improvements are due to increased charge transfer efficiency from the basal plane toward the edge sites. Photo-electrocatalytic measurements and carrier transport simulations reveal the impact of suppressed band bending in nanoribbons below the depletion width toward achieving edge-dominated HER. Our results demonstrate the potential of confinement in electrocatalysis and provide a universal route toward nanoribbon-enhanced electrochemistry.
Permanent Link: https://hdl.handle.net/11104/0344350