- Title
- S, N co-doped carbon nanotube-encapsulated core-shelled CoS2@Co nanoparticles: efficient and stable bifunctional catalysts for overall water splitting
- Creator
- Wang, Jing-Yu; Ouyang, Ting; Li, Nan; Ma, Tianyi; Liu, Zhao-Qing
- Relation
- Science Bulletin Vol. 63, Issue 17, p. 1130-1140
- Publisher Link
- http://dx.doi.org/10.1016/j.scib.2018.07.008
- Publisher
- Elsevier
- Resource Type
- journal article
- Date
- 2018
- Description
- Hydrogen, serving as a clean, sustainable energy source, may be mainly produced from electrolysis water. Herein, we report cobalt disulphide encapsulated in self-catalyzed carbon nanotubes (S, N-CNTs/CoS2@Co) serving as a bifunctional catalyst, which exhibits excellent hydrogen evolution reaction performance (10.0 mA cm-2at 0.112 V, and low Tafel slope for 104.9 mV dec-1) and oxygen evolution reaction performance (10.0 mA cm-2at 1.57 V, and low Tafel slope for 76.1 mV dec-1), meanwhile with a strong stability at various current densities. In-depth study reveals that the excellent catalytic properties can be mainly attributed to the increased catalytic sites induced by S, N co-doping, the improved electronic conductivity derived from the carbon nanotubes, and Mott-Schottky effect between the metal cobalt and semiconductive cobalt disulfide. Notably, when the bifunctional catalysts are applied to overall water splitting, a low potential of 1.633 V at the current density of 10.0 mA cm-2is achieved, which can compete with the precious metal catalyst benchmarks in alkaline media, demonstrating its promising practicability in the realistic water splitting application. This work elucidates a practicable way to the design of transition metal and nano-carbon composite catalysts for a broad application in the fields of energy chemistry.
- Subject
- core-shell structure; hydrogen evolution; oxygen evolution; bifunctional catalyst; overall water splitting; SDG 7; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1441048
- Identifier
- uon:41303
- Identifier
- ISSN:2095-9273
- Language
- eng
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Goal 7: Ensure access to affordable, reliable, sustainable and modern energy