Edge-dominated hydrogen evolution reactions in ultra-narrow MoS nanoribbon arrays

Future energy generation and storage requirements emphasize the importance of high-performance electrocatalysis. MoS 2 edges exhibit ideal energetics for hydrogen evolution reactions (HERs) if challenges in their kinetics are addressed. Herein, we investigate the emergence of edge-dominated electroc...

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Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2023-07, Vol.11 (29), p.1582-1581
Main Authors: Chen, Ding-Rui, Muthu, Jeyavelan, Guo, Xing-You, Chin, Hao-Ting, Lin, You-Chen, Haider, Golam, Ting, Chu-Chi, Kalbá, Martin, Hofmann, Mario, Hsieh, Ya-Ping
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Summary:Future energy generation and storage requirements emphasize the importance of high-performance electrocatalysis. MoS 2 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 MoS 2 nanoribbons. A templated subtractive patterning process (TSPP) served as a powerful platform that yields large arrays of MoS 2 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. We achieved edge-dominated HER in ultra-narrow MoS 2 nanoribbon arrays created by a templated subtractive patterning process. In such structures, the efficient carrier injection into edge sites enhances the electrochemical performance by orders of magnitude.
ISSN:2050-7488
2050-7496
DOI:10.1039/d3ta01573d