Design and optimization of cobalt-encapsulating vertical graphene nano-hills for hydrogen evolution reaction

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In spite of its great potential for sustainable water splitting technology, many challenges remain for the development of effective graphene-based hydrogen evolution reaction (HER) electrocatalysts. Based on mutually corroborating growth, electrochemical measurements, and density functional theory (DFT) calculations, we herein develop the HER-active vertical graphene nano-hills (VGNHs) on Co thin films such that Co atoms are introduced into the VGNH tip region. The HER activity exhibits a volcano-shaped curve with respect to the encapsulated Co density, and the best performance achieved at the nominal Co substrate thickness of 1 nm is characterized by the low onset potential, overpotential, and Tafel slope in acidic electrolyte. Especially, with this low-cost yet structurally and chemically stable Co-seeded VGNH catalyst, a record-level mass activity is achieved. The emergence of the HER activity from the combination of originally HER-inactive VGNHs and Co thin films is clarified by DFT calculations, which identifies the synergistic effects of the nanoscale curvature at the VGNH tip and the charge-transfer doping by encapsulated Co atoms.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2019-07
Language
English
Article Type
Article
Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.7, no.28, pp.17046 - 17052

ISSN
2050-7488
DOI
10.1039/c9ta04878b
URI
http://hdl.handle.net/10203/263957
Appears in Collection
EEW-Journal Papers(저널논문)
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