A durable and pH-universal self-standing MoC-Mo2C heterojunction electrode for efficient hydrogen evolution reaction.
Springer Science and Business Media LLC
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Liu, W., Wang, X., Wang, F., Du, K., Zhang, Z., Guo, Y., Yin, H., & et al. (2021). A durable and pH-universal self-standing MoC-Mo2C heterojunction electrode for efficient hydrogen evolution reaction.. Nat Commun, 12 (1) https://doi.org/10.1038/s41467-021-27118-6
Efficient water electrolyzers are constrained by the lack of low-cost and earth-abundant hydrogen evolution reaction (HER) catalysts that can operate at industry-level conditions and be prepared with a facile process. Here we report a self-standing MoC-Mo2C catalytic electrode prepared via a one-step electro-carbiding approach using CO2 as the feedstock. The outstanding HER performances of the MoC-Mo2C electrode with low overpotentials at 500 mA cm-2 in both acidic (256 mV) and alkaline electrolytes (292 mV), long-lasting lifetime of over 2400 h (100 d), and high-temperature performance (70 oC) are due to the self-standing hydrophilic porous surface, intrinsic mechanical strength and self-grown MoC (001)-Mo2C (101) heterojunctions that have a ΔGH* value of -0.13 eV in acidic condition, and the energy barrier of 1.15 eV for water dissociation in alkaline solution. The preparation of a large electrode (3 cm × 11.5 cm) demonstrates the possibility of scaling up this process to prepare various carbide electrodes with rationally designed structures, tunable compositions, and favorable properties.
7 Affordable and Clean Energy
National Natural Science Foundation of China (National Science Foundation of China) (52031008, 51874211)
External DOI: https://doi.org/10.1038/s41467-021-27118-6
This record's URL: https://www.repository.cam.ac.uk/handle/1810/332395
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/
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