Modulating Electronic Structure and Mass Transfer Kinetics via Mo‐Mo₂C Heterostructure for Ampere‐Level Hydrogen Evolution

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 25, 2025

Abstract Molybdenum carbide (Mo 2 C), known for its platinum‐like electronic structure and excellent corrosion resistance, has demonstrated promising catalytic performance in laboratory tests. However, under industrial harsh conditions, the of Mo C faces constraints due to inherently strong hydrogen adsorption. Additionally, at elevated current densities, rapid depletion active species electrolyte, coupled with gas bubble accumulation, introduce significant mass transport challenges. This work introduces an electrode Mo‐Mo heterostructures supported on a plate (Mo‐Mo C/Mo). Further analyses reveal that incorporating metallic into optimizes C. optimization achieves more balanced adsorption, while also enhancing capacity water adsorption dissociation C, collectively improving activity. Furthermore, this features unique “bush‐like” surface morphology can induce “turbulence” effect electrolyte near surface, facilitating flow transport. As result, C/Mo exhibits high densities (η 1000 = 452 mV). Moreover, resistance robust integration ensure long‐term stability, remaining stable 1.5 A 6 M KOH over extended periods.

Language: Английский

Keto-Oxygen on Graphitic Surface with Downshifted p-Band Center Achieves Efficient Metal-Free Transfer Hydrogenation of Nitroarenes

Nano Letters, Journal Year: 2025, Volume and Issue: unknown

Published: April 24, 2025

The critical challenge in utilizing carbon-based nanomaterials is identifying the active site. Herein, we demonstrate keto-oxygen on graphitic surface as sites for catalytic transfer hydrogenation (CTH) and present an efficient nanocrystalline diamond (ND)-derived catalyst metal-free CTH of nitroarenes to imine with 99.9% nitrobenzene conversion exclusive selectivity (99.9%). By selectively deconstructing or eliminating carbonyl groups, graphite-conjugated group confirmed catalytically Moreover, kinetic studies display lower activation barrier benzylalcohol than that (88.8 vs 119.1 kJ mol-1, respectively), indicating alcohol dehydrogenation occurs prior nitrobenzene. Density functional theory calculations reveal downshifted p-band center sp2 hybrid C affords moderate adsorption benzaldehyde intermediates, which accelerates formation H following step responsible high activity.

Language: Английский