Details

Autor(en) / Beteiligte

• Ding-Rui, Chen
• Jeyavelan Muthu
• Xing-You, Guo
• Hao-Ting, Chin
• You-Chen, Lin
• Haider, Golam
• Chu-Chi, Ting
• Kalbáč, Martin
• Hofmann, Mario
• Hsieh, Ya-Ping

Titel

Edge-dominated hydrogen evolution reactions in ultra-narrow MoS2 nanoribbon arrays

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2023-07, Vol.11 (29), p.15802-15810

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2023

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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.