Wang, Haige, Hou, Bo  ORCID: https://orcid.org/0000-0001-9918-8223, Yang, Yang, Chen, Qianwang, Zhu, Meifang, Thomas, Arne and Liao, Yaozu
2018.
Cobalt nanocrystals encapsulated in heteroatom-rich porous carbons derived from conjugated microporous polymers for efficient electrocatalytic hydrogen evolution.
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10.1002/smll.201803232
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Abstract
Cobalt nanocrystals encapsulated in N,O‐dual‐doped porous carbons as efficient and stable electrocatalysts for hydrogen evolution reaction (HER) are reported. A heteroatom‐rich‐conjugated microporous polymer is first chemically deposited on a carbon fiber cloth, and after addition of a cobalt salt, pyrolyzed to produce a heteroatom‐doped C/Co nanocrystal composite. With this process, the use of additional binders for preparation of electrodes can be avoided. With a trace cobalt loading (0.46 wt%), the electrodes achieve a low Tafel slope of 46 mV dec−1 and overpotential of only 69 mV at a current density of 10 mA cm−2 in 0.5 m H2SO4. Experimental and computational studies reveal that the superior HER behavior is due to a decreased free energy of hydrogen adsorption, induced by i) electrons transferred from the cobalt nanocrystals to graphite layers and ii) N,O‐dual doping reduced the Fermi level of neighboring C atoms.
| Item Type: | Article |
|---|---|
| Date Type: | Publication |
| Status: | Published |
| Schools: | Schools > Physics and Astronomy |
| Publisher: | Wiley |
| ISSN: | 1613-6810 |
| Date of First Compliant Deposit: | 25 February 2020 |
| Last Modified: | 19 Jul 2025 03:45 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/129541 |
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