期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 271, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2020.118939
关键词
Cobalt-based composites; N-doped carbon nanotubes; Electrocatalyst; Density functional theory calculation; Overall water splitting
资金
- National Natural Science Foundation of China [NSFC51672116]
- Liaoning Province Science and Technology Planning Project [20180551203]
- Liao Ning Revitalization Talents Program [XLYC1902066]
A binder-free electrode with metallic Co embedded in N-doped carbon nanotube array (Co@N-CNT) was fabricated via an electrodeposition, stereoscopic assembly and self-boosting catalytic pyrolysis. Specifically, directed-eletrodeposition vertical growth of Co(OH)(2)-nanosheet serves as the structure inducer to offer abundant sites for ZIF-67 growth, and melamine is selected as an initiator for orientated growth of N-CNTs. As an integrative non-noble electrocatalyst for water splitting, it requires only 1.58 V to achieve 30 mA cm(-2) in an alkali-electrolyzer. The remarkable electrochemical performance is mainly attributed to the unique 3D hierarchical tubular structure and the synergistic effect of each chemical compositions, which provide amount of accessible active sites, accelerate the diffusion of electron/electrolyte, and improve the electrical conductivity, hydrophilicity and structural stability. The electro-catalytic splitting water mechanism was further explored by density functional theory. This universal method can be extensively applied to fabricate well-defined monometal or bimetal encapsulated into N-CNTs for various electrochemical applications.
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