期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 7, 期 22, 页码 13671-13678出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9ta03473k
关键词
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资金
- Beijing Municipal Natural Science Foundation [2182050, 2182046]
- Fundamental Research Funds for the Central Universities of China [JD1923, 12060093063]
- National Natural Science Foundation of China [21506010, 21706004]
- Zhongguancun Frontier Technology and Industrial Service Alliance
- HPC of BUCT
A 3D self-supported hierarchical architecture composed of Ni nanoparticle@nitrogen-doped carbon nanotube modified NiMoN micro-pillar arrays grown on Ni foam (Ni@NCNT/NiMoN/NF) was synthesized. Benefiting from the protection by N-doped carbon layers, and the well-designed hierarchical structure with a large surface area, high electrical conductivity and convenient mass/electron transfer paths, this composite shows excellent activity and durability under both acidic and alkaline conditions. It demands extremely low overpotentials of 15 mV and 156 mV in 1.0 M KOH, and 31 and 96 mV in 0.5 M H2SO4 to achieve current densities of 10 and 200 mA cm(-2), respectively, which are superior to those for commercial Pt/C and other control samples. DFT calculations prove that the synergetic effect between N-doped carbon, Ni, and NiMoN enhances H2O adsorption and decreases hydrogen adsorption free energy (vertical bar Delta G(H*)vertical bar) to facilitate the HER process. Furthermore, the composite possesses extraordinary antioxidation ability under the conditions of the cyclic current pulse and power-off-on state. This work suggests an effective pathway to enhance the catalytic activity and oxidation resistance by building a hierarchical structure encapsulated by thin N-doped carbon layers, showing promising potency as the HER electrode in practical energy conversion and storage systems of wind power and solar power.
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