Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 286, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2021.119882
Keywords
MoN; Hetero-interface; Water dissociation; Electrocatalyst; Hydrogen evolution
Funding
- National Natural Science Foundation of China [21775078, 51672143, 21802079]
- Youth Innovation Team Project of Shandong Provincial Education Department [2019KJC023]
- Shandong Provincial Natural Science Foundation of China [ZR2016JL007, JQ201713]
- Taishan Scholars Program
- NSERC
- NRC
- University of Saskatchewan
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The study introduces a new strategy to enhance the water dissociation capacity of MoN by forming a Co/MoN hetero-interface nanoflake array, achieving remarkable HER activity in alkaline conditions. Modulation of MoN's electronic structure through electron transfer at the Co/MoN hetero-interface, and the significant increase in electrochemically active surface area of the Co/MoN nanoarray were key factors contributing to the enhanced performance.
Developing high-performance electrocatalyst for hydrogen evolution reaction (HER) is paramount for hydrogen economy. Molybdenum-based nitrides (MoNx) are promising HER catalysts in alkaline condition; however, the performance is greatly limited by the weak water dissociation capacity to form adsorbed H* from H2O, which is crucial but long ignored. Herein, we develop a new strategy to enhance the water dissociation capacity of MoN by forming Co/MoN hetero-interface nanoflake array. The electronic structure of MoN can be effectively modulated by the electron transfer occurred at the Co/MoN hetero-interface. Co/MoN nanoarray also possesses a significantly increased electrochemically active surface area. Co/MoN nanoarray thus exhibits remarkable HER activity with an overpotential of 132 mV to reach 100 mA/cm(2), which is among the best non-noble metal HER electrocatalysts in alkaline solution. The very low energy barrier of -0.04 eV for water dissociation on Co/MoN calculated by density functional theory confirms the strong water dissociation capability.
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