期刊
SUSTAINABLE ENERGY & FUELS
卷 4, 期 1, 页码 407-416出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9se00897g
关键词
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资金
- National Natural Science Foundation of China [61390502]
- Beijing National Laboratory for Molecular Sciences (BNLMS) [BNLMS20160119]
- Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education, Harbin Institute of Technology [2015KM006]
- Heilongjiang Postdoctoral Foundation [LBH-Q16091]
- Fundamental Research Funds for the Central Universities
- NSRIF [201854]
Searching for promising HER electrocatalysts is an urgent task for the practical application of hydrogen production by water electrolysis. The Mott-Schottky effect between a metal with larger work function and n-type semiconductor with a higher Fermi level will facilitate the electron transfer from the semiconductor toward the metal. As a result, it is possible to design optimal H* adsorption active sites with thermoneutral hydrogen adsorption free energy (Delta G(H*)). Herein, MoC nanoparticles with a diameter of about 3.4 nm embedded in N, P-codoped carbon were converted from well-defined polyoxometalates (around 1 nm) and polypyrrole nanocomposites by carbonization and further wrapped on the surface of CNTs. On the basis of improved electron transfer rate, increased carrier densities, and enhanced active site activities on MoC after lowering the work function due to the Mott-Schottky effect with n-type domains in N, P-codoped carbon, our electrocatalysts could drive the current density of 10 mA cm(-2) at 175 mV with a Tafel slope of 62 mV dec(-1) and TOF value of 1.49 s(-1) at 150 mV, as well as long-term H-2 production stability. The present study provides a new guideline for the design and preparation of Mott-Schottky HER electrocatalysts.
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