期刊
ELECTROCHIMICA ACTA
卷 353, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2020.136475
关键词
Ions implantation; Hydrogen evolution reaction; All pH range
资金
- National Key Research and Development Program of China [2018YFB1502003]
- Natural Science Foundation of China [11875207, 11522543, 11935011, 51571153]
- Program for New Century Excellent Talents in University [NCET-130438]
- Fundamental Research Funds for the Central Universities
- Key Science Foundation of Higher Education of Henan [19A140008]
Ion implantation is a facile surface modification technology for greatly tailoring the surface electron structure of materials, which is very important for catalytic activity. Here we report a new universal synthesis of stable, large-scale N-doped carbon fiber cloth embedded with non-noble metal nanoparticles (CN@(Ni, Fe and Co)) by ion implantation for largely enhanced hydrogen evolution reaction (HER) activity under acidic (0.5 M H2SO4), neutral (0.5 M phosphate buffer, PH = 7) and basic solution (1M KOH). From the polarization curves, the overpotentials of current density for CN@Ni at 10 mA/cm(2) decrease obviously from 710, 838 and 717 mV to 381, 589 and 532 mV in acidic, neutral and basic solution, respectively. Density functional theory (DFT) calculations also demonstrate that the Gibbs free energy (Delta G(H)*) for H* adsorption of CN@Ni is much closer to the optimal value of Delta G(H)* = 0.15 eV compared with 1.84 eV of C and 0.86 eV of CN. The method is general and we demonstrate it using Fe+ and Co+ ions implantation into carbon fiber cloth to fabricate metal nanoparticles embedded carbon fiber cloth. Furthermore, this controlled technique is promising for industrial production of noble-metal-free HER electrocatalysts with large scale, low cost and high efficiency. (c) 2020 Elsevier Ltd. All rights reserved.
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