期刊
MATERIALS TODAY CHEMISTRY
卷 23, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.mtchem.2021.100668
关键词
Co nanoparticles; Nitrogen doped graphene; Core-shell structure; Phase effect; Water oxidation
资金
- CSIR, Govt. of India [01(2977)/19/EMR-II]
- DST-INSPIRE [180147]
- Federal Ministry of Education and Research under the Make Our Planet Great Again-German Research Initiative (MOPGA-GRI) [57429784]
- German Federal Ministry of Education and Research [03EW0015A/B]
The Mott-Schottky catalyst Co@NC demonstrates excellent oxygen evolution activity and long-term stability by entrapping cobalt nanoparticles inside the N-doped graphene shell. The synergy between hcp and fcc cobalt, along with the optimization from the NC shell, plays a major role in improving the catalytic activity.
Herein, we report a Mott-Schottky catalyst by entrapping cobalt nanoparticles inside the N-doped graphene shell (Co@NC). The Co@NC delivered excellent oxygen evolution activity with an overpotential of merely 248 mV at a current density of 10 mA cm(-2) with promising long-term stability. The importance of Co encapsulated in NC has further been demonstrated by synthesizing Co nanoparticles without NC shell. The synergy between the hexagonal close-packed (hcp) and face-centered cubic (fcc) Co plays a major role to improve the OER activity, whereas the NC shell optimizes the electronic structure, improves the electron conductivity, and offers a large number of active sites in Co@NC. The density functional theory calculations have revealed that the hcp Co has a dominant role in the surface reaction of electrocatalytic oxygen evolution, whereas the fcc phase induces the built-in electric field at the interfaces with N-doped graphene to accelerate the H+ ion transport. (C) 2021 Elsevier Ltd. All rights reserved.
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