التفاصيل البيبلوغرافية
| العنوان: |
Facile route of nitrogen doping in nickel cobalt phosphide for highly efficient hydrogen evolution in both acid and alkaline electrolytes. |
| المؤلفون: |
Zhang, Long1 (AUTHOR) zhanglongsir@163.com, Qi, Yuyang2 (AUTHOR), Sun, Lan2 (AUTHOR), Chen, Guanjun2 (AUTHOR), Wang, Luxue1 (AUTHOR), Zhang, Mingshuo1 (AUTHOR), Zeng, Dejun1 (AUTHOR), Chen, Yongnan1 (AUTHOR) frank_cyn@163.com, Wang, Xingang1 (AUTHOR), Xu, Kewei2 (AUTHOR), Ma, Fei1,2 (AUTHOR) mafei@mail.xjtu.edu.cn |
| المصدر: |
Applied Surface Science. May2020, Vol. 512, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*HYDROGEN evolution reactions, *COBALT phosphide, *NICKEL phosphide, *SULFURIC acid, *HYDROGEN transfer reactions, *CHARGE transfer |
| مستخلص: |
N doped NiCoP exhibits superior HER activity in both acid and alkaline electrolytes owing to the optimized binding strength of H in Ni-Co bridge sites and accelerated charge transfer. • Nitrogen doping in NiCoP nanowires arrays on CFP was synthesized by a facile hydrothermal reaction and CVD method. • N dopant prefer to replace O defects rather than P atoms in NiCoP lattice, which is confirmed by XPS analysis and DFT calculations. • N-doping effect could remarkably enhance the HER activity in both acid and alkaline electrolytes. • The optimized ΔG H* value in Ni-Co bridge sites and increased d-orbital electronic density of Co and Ni promotes the charge transfer of HER. Ternary nickel cobalt phosphide (NiCoP) is believed to be a promising water-splitting electrocatalyst owing to the synergistic effect between different transition metals. Herein, nitrogen doping NiCoP (N-NiCoP) nanowire arrays on carbon fiber paper skeleton (CFP) are synthesized by a facile hydrothermal reaction and subsequent phosphorization-nigtrogenization method. Structural characterizations and density functional theory (DFT) calculations demonstrate that N dopant prefer to replace O defects rather than P atoms in NiCoP lattice. It is illustrated that the Gibbs free energy of H (ΔG H*) in Ni-Co bridge sites is lowered from −0.35 eV of NiCoP to −0.26 eV of N-NiCoP by 25.7%, moreover, the increased d-orbital electronic density of Co and Ni promotes the charge transfer of hydrogen evolution reaction (HER). Consequently, the HER performance of N-NiCoP is substantially enhanced as compared to NiCoP. For N-NiCoP, the overpotentials to reach a current density of 100 mA·cm−2 are 149 and 162.5 mV in 0.5 M H 2 SO 4 and 1 M KOH, respectively, and their Tafel slopes are 40.1 and 59.8 mV·dec−1, respectively. N doping offers an effective and promising route for improved HER performance of NiCoP catalyst in acid and alkaline electrolytes. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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