Year-end Sale % OFF 
Abstract
Nickel/cobalt-based selenides is considered as a promising electrocatalyst for overall water splitting ascribed to rapid electron transfer ability and long-term durability. However, the sluggish water dissociation kinetics and high Gibbs free energy seriously hinder its actual application. Herein, interface engineering is proposed to promote the formation of high-valence metal cations, thus activating the active center of electrocatalytic water dissociation and reducing the adsorption/desorption free energy of the intermediates significantly. In addition, a stable hollow mesoporous structure is constructed through structural engineering, which provides abundant accessible inner and outer surfaces, and the capillary phenomenon caused by the hollow structure promotes the adsorption of water molecules in the reaction center and the desorption of gases. Based on the coupling effect described above, the hollow/porous NiSe/CoSe2-100 nanotubes (denoted as NiSe/CoSe2-X HNTs, X is the weight of Se powder) demonstrate an overpotential of 117 and 225 mV for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER), respectively. Meanwhile, the system of NiSe/CoSe2-100 HNTs//NiSe/CoSe2-100 HNTs requires a low voltage of 1.46 V to drive water splitting and the faraday efficiency is close to 100%. Overall, a new route is proposed for the construction of electrocatalysts with fast hydrolysis kinetics.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
