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3D self-supported Ni nanoparticle@N-doped carbon nanotubes anchored on NiMoN pillars for the hydrogen evolution reaction with high activity and anti-oxidation ability

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Abstract

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 (|ΔGH*|) 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.

Graphical abstract: 3D self-supported Ni nanoparticle@N-doped carbon nanotubes anchored on NiMoN pillars for the hydrogen evolution reaction with high activity and anti-oxidation ability

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Publication details

The article was received on 02 Apr 2019, accepted on 14 May 2019 and first published on 14 May 2019


Article type: Paper
DOI: 10.1039/C9TA03473K
J. Mater. Chem. A, 2019, Advance Article

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    3D self-supported Ni nanoparticle@N-doped carbon nanotubes anchored on NiMoN pillars for the hydrogen evolution reaction with high activity and anti-oxidation ability

    Y. Gong, L. Wang, H. Xiong, M. Shao, L. Xu, A. Xie, S. Zhuang, Y. Tang, X. Yang, Y. Chen and P. Wan, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA03473K

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