N, P (S) Co-doped Mo2C/C hybrid electrocatalysts for improved hydrogen generation
2018
Wang, Dezhi | Liu, Tianying | Wang, Junchao | Wu, Zhuangzhi
Recently, molybdenum carbide (Mo₂C) has aroused tremendous interests as a potential candidate to replace Pt-based electrocatalysts for hydrogen evolution reaction (HER). However, the HER performance of Mo₂C is intrinsically limited by the empty d-orbitals with a large density in Mo₂C and the resulting strong Mo-H bonding. Heteroatom-doping is an effective route for tuning the d-orbitals of Mo₂C and improving the catalytic activity. Hence, in this work, we design two facile pathways to synthesize unique N, P and N, S dual-doped Mo₂C/C hybrid electrocatalysts as highly active HER catalysts. The co-doping of N, P and N, S involves the substitute of C atoms in both Mo₂C crystals and carbon matrix for a better synergistic effect, and can further improve the HER activity of Mo₂C electrocatalysts compared to individual N doping. As expected, the obtained N, P or N, S dual-doped Mo₂C catalyst (NP-Mo₂C or NS-Mo₂C) exhibits lower electrochemical resistance, higher intrinsic activity of each active site, or larger electrochemically active surface area (AECSA, for NP-Mo₂C), thus leading to enhanced HER activity as well as stability in the acidic solution.
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