期刊
CHEMCATCHEM
卷 8, 期 6, 页码 1218-1225出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201501341
关键词
electrochemistry; hydrogen; molybdenum; nitrides; water splitting
资金
- Department of Science & Technology (DST)
- Department of Electronics and Information Technology (DeitY)
- CSIR, Govt. of India
- UGC, Govt. of India
Among catalysts based on non-noble metals, Mo-based materials are important for hydrogen evolution because of their low cost, good conductivity, and catalytic efficiency. This study demonstrates a facile two-step synthesis of Mo2N nanostructures assembled from 5-8nm particles with graphitic carbon nitride as the nitrogen source. These Mo2N nanostructures of various morphologies (hexagons, triangles, and nanowires) show a very high activity and stability in acidic media during water electrolysis. Their nanostructures were characterized by using powder XRD, electron microscopy, N-2 gas adsorption analysis, and X-ray photoelectron spectroscopy. Hydrogen evolution reaction parameters, which include the Tafel slope, charge transfer resistance, and stability, were analyzed by using linear sweep voltammetry and electrochemical impedance spectroscopy. Thin hexagonal sheets of Mo2N show the highest apparent electrocatalytic activity (current density of 197mAcm(geometric)(-2) at -400mV vs. the reversible hydrogen electrode) and excellent stability in an acidic medium with a small onset potential of 90mV and a Tafel slope of 145mVdecade(-1). The lowest Tafel slope was observed for Mo2N nanowires.
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