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Carbon impurity-free, novel Mn,N co-doped porous Mo2C nanorods for an efficient and stable hydrogen evolution reaction

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Abstract

Heteroatom doping is an effective way to modulate the electronic configuration and optimize the electroactivity over a series of electrocatalytic materials. Here we report novel kinds of Mn,N co-doped porous Mo2C nanorods for the hydrogen evolution reaction (HER) in acidic solution, which are facilely fabricated based on Mn-modified MoOx-amine precursors. The obtained porous, monocrystalline nanorods without carbon impurities could not only provide abundant catalytic sites, but also facilitate electrolyte penetration and hydrogen release. Furthermore, the fine-tuned electronic structure of Mo2C nanorods with Mn,N dopants could produce more available active sites and reduce the hydrogen adsorption energy (ΔGH*). As a result, the optimized Mn,N co-doped Mo2C nanorods exhibit high HER activity with a low overpotential (η10 = 163 mV), a small Tafel slope (66 mV dec−1), and excellent long-term stability in acidic electrolyte. EPR and DFT calculations confirm that the high performance originates from new active sites (Mn site), a low charge-transfer resistance and an optimized adsorption–desorption behavior after Mn,N co-doping. This work may provide a new pathway to design and explore efficient non-noble metal water-splitting electrocatalysts via electronic engineering of their compositions and nanostructures.

Graphical abstract: Carbon impurity-free, novel Mn,N co-doped porous Mo2C nanorods for an efficient and stable hydrogen evolution reaction

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Publication details

The article was received on 08 Jun 2019, accepted on 25 Jul 2019 and first published on 26 Jul 2019


Article type: Research Article
DOI: 10.1039/C9QI00676A
Inorg. Chem. Front., 2019, Advance Article

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    Carbon impurity-free, novel Mn,N co-doped porous Mo2C nanorods for an efficient and stable hydrogen evolution reaction

    Y. Zhou, J. Xu, C. Lian, L. Ge, L. Zhang, L. Li, Y. Li, M. Wang, H. Liu and Y. Li, Inorg. Chem. Front., 2019, Advance Article , DOI: 10.1039/C9QI00676A

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