Journal
MATERIALS TODAY PHYSICS
Volume 16, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.mtphys.2020.100303
Keywords
In-situ; Self-catalyzed; Carbon nanotubes; Bimetallic nanoparticles; Oxygen evolution reaction
Funding
- National Natural Science Foundation of China [51872139]
- NSF of Jiangsu Province [BK20170045]
- Six Talent Peak Project of Jiangsu Province [XCL-043]
- Natural Science Basic Research Program of Shaanxi [2019JLM-28]
- Projects of International Cooperation and Exchanges NSFC [51811530018]
- Fundamental Research Funds for the Central Universities
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The self-catalyzed growth of NiCo bimetallic nanoparticles embedded in N-doped nanotubes (NCNTs) on carbon cloth substrate provides significant advantages for oxygen evolution reaction (OER) performances and long-term stability, showing improvements in overpotential and Tafel slope.
The self-catalyzed growth of nano-structures on material surfaces is an economic and time-efficient way of designing multifunctional electrocatalysts for vast applications. NiCo bimetallic nanoparticles embedded in N-doped nanotubes (NCNTs) on carbon cloth substrate were formed here by a simple two-step method via hydrothermal treatment followed by in-situ pyrolysis and self-catalysis through chemical vapor deposition. The unique three-dimensional network and Ni/Co-N-C coordination of NiCo/NCNTs electrocatalyst provide predominant advantage for short-range and long-range conductivity and exposure of active sites. Such beneficial characteristics result in significant improvement in oxygen evolution reaction (OER) performances. The electrocatalysts obtained from two NiCo bimetallic hydroxides with different structures exhibit the overpotential of 210 and 290 mV at current density of 20 mA cm(-2) and the Tafel slope of 148 and 160 mV dec(-1), respectively. In addition, electrocatalysts showed long-term stability throughout 25 h with negligible lost in catalytic activities of approximately 10.6% and 12.8%, respectively. (C) 2020 Elsevier Ltd. All rights reserved.
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