Abstract
We have studied the electrolysis of water, by performing a combined experimental and theoretical study of the hydrogen evolution reaction (HER) capability of \({\mathrm{Mo}}_2{\mathrm{C}}\)–\({\mathrm{Mo}}_2{\mathrm{N}}\) composites. Experimentally, we have synthesized nanowires with varying \({\mathrm{Mo}}_2{\mathrm{C}}\):\({\mathrm{Mo}}_2{\mathrm{N}}\) ratios. We have found that the composites show good HER activity in an acidic medium, that is superior to that of either pristine \({\mathrm{Mo}}_2{\mathrm{C}}\) or \({\mathrm{Mo}}_2{\mathrm{N}}\). These experimental results are supported by ab initio density functional theory calculations. Interestingly, we find that it is vital to incorporate van der Waals corrections to accurately reproduce the experimentally observed structural transition from an orthorhombic to tetragonal phase as x, the N concentration in \({\mathrm{Mo}}_2{\mathrm{C}}_{1-x}{\mathrm{N}}_x\), is increased. By computing Gibbs free energy for H adsorption on \({\mathrm{Mo}}_2{\mathrm{C}}_{1-x}{\mathrm{N}}_x\) surfaces, our calculations confirm the experimental finding that mixed systems have superior HER activity to pristine systems, with N-rich systems being most active.
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ACHARYA, D., OJHA, K., MAMMEN, N. et al. Enhanced hydrogen evolution reactivity on \({\mathrm{Mo}}_2{\mathrm{C}}\)–\({\mathrm{Mo}}_2{\mathrm{N}}\) composites. Bull Mater Sci 43, 321 (2020). https://doi.org/10.1007/s12034-020-02230-3
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DOI: https://doi.org/10.1007/s12034-020-02230-3