NDLI: Three-dimensional tetsubo-like Co(OH)<sub>2</sub> nanorods on a macroporous electrically conductive network as an efficient electroactive framework for the hydrogen evolution reaction

Content Provider	Royal Society of Chemistry (RSC)
Author	Wu, Dajun Lian, Kenan Huang, Rong Tong, Xin Xu, Shaohui Qi, Ruijuan Zhu, Yiping Wang, Lianwei Zhang, Chi Chu, Paul K. Xiong, Dayuan
Copyright Year	2017
Abstract	Conducting the hydrogen evolution reaction (HER) in an alkaline environment using a non-precious transition metal catalyst with high efficiency is challenging. Here, we report excellent HER activity achieved using three-dimensional (3D) tetsubo-like Co(OH)2 nanorods on a macroporous electrically conductive network (MECN) synthesized by a hydrothermal method. This unique framework comprises three levels of porous structures, including a bottom-ordered MECN substrate, an intermediate layer of vertically porous Co(OH)2 nanowires with a mean diameter of 100 nm and length of about 2 μm, and outmost Co(OH)2 nanosheets (≈20 nm). The 3D array structure with a large aspect ratio provides a large specific surface area and exposes more active sites to catalyze electrochemical reactions at the electrode–electrolyte interface. Compared with Co(OH)2 nanosheets on an MECN and foamy Co(OH)2 on an MECN structure, the synthesized architecture has excellent HER catalytic reactivity, including a low potential of −69.2 mV vs. RHE, a cathodic current density of 10 mA cm−2, a small Tafel slope of 61.9 mV dec−1, a high current density, and robust catalytic stability in 1 M KOH, and is promising in HER applications.
Starting Page	2629
Ending Page	2639
Page Count	11
File Format	HTM / HTML PDF
ISSN	20507488
Volume Number	5
Issue Number	6
Journal	Journal of Materials Chemistry A
DOI	10.1039/c6ta09728f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	RHE Tafel Hydrogen Transition metal Three-dimensional space Hydrothermal circulation Micrometre Aspect ratio Specific surface area Electrochemistry Partial current Current density
Content Type	Text
Resource Type	Article
Subject	Chemistry Renewable Energy, Sustainability and the Environment Materials Science

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