Journal
APPLIED SURFACE SCIENCE
Volume 507, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2019.145155
Keywords
Cobalt; Carbon nanotubes; Oxygen evolution reaction; Electrocatalysts
Categories
Funding
- Hong Kong Scholars Program [XJ2018009]
- National Natural Science Foundation of China [51504171, 51572100]
- Outstanding Young and Middle-aged Scientific Innovation Team of Colleges and Universities of Hubei Province [T201402]
- Project of Natural Science Foundation of Hubei Province [2015CFA116]
- City University of Hong Kong Strategic Research Grant (SRG) [7005105]
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Low-cost, environmentally friendly, and efficient electrocatalysts are required for large-scale and commercial generation of O-2 and H-2 by the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). Herein, composites composed of Co and carbon nanotubes (Co NPs@CNT) are fabricated by one-step chemical vapor deposition (CVD) using commercial Co nanoparticles and benzene as precursors. In the alkaline medium, Co NPs@CNT exhibits a small overpotential of 380 mV at a current density of 10 mA cm(-2), small Tafel slope of 82.2 mV dec(-1), and excellent structural and electrochemical durability and the properties are better than those of most previously reported Co-based electrocatalysts and commercial Co nanoparticles. The CNTs not only provide high conductivity, but also decrease the adsorption energy of OH* on the surface of Co NPs@CNT. The small energy barrier is responsible for the enhanced OER performance of Co NPs@CNT. In addition to the revelation of the synergistic effects between Co and CNTs, our results provide insights into the development of metal-carbon electrocatalysts and the simple and effective strategy described here has large commercial potential.
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