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Hierarchical construction of hollow NiCo2S4 nanotube@NiCo2S4 nanosheet arrays on Ni foam as an efficient and durable electrocatalyst for hydrogen evolution reaction.

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Title: Hierarchical construction of hollow NiCo2S4 nanotube@NiCo2S4 nanosheet arrays on Ni foam as an efficient and durable electrocatalyst for hydrogen evolution reaction.
Authors: Bai, Lei1 (AUTHOR), Song, Ailing1 (AUTHOR) ailing.song@ysu.edu.cn, Lei, Xinyue1 (AUTHOR), Zhang, Tianhong1 (AUTHOR), Song, Shenglu1 (AUTHOR), Tian, Hao1,2 (AUTHOR) hao.tian@uts.edu.au, Liu, Hao1,2 (AUTHOR) hao.liu@uts.edu.au, Qin, Xiujuan1 (AUTHOR) qinxj@ysu.edu.cn, Wang, Guoxiu2 (AUTHOR), Shao, Guangjie1,3 (AUTHOR) shaoguangjie@ysu.edu.cn
Source: International Journal of Hydrogen Energy. Nov2022, Vol. 47 Issue 91, p38524-38532. 9p.
Subjects: Hydrogen evolution reactions, Transition metals, Ion exchange (Chemistry), Electronic structure, Nanotubes, Foam
Abstract: Ternary transition metal chalcogenide (TTMC) with multicomponent, different phases and unique electronic structures have been studied in electrocatalytic hydrogen evolution reaction (HER). However, the strong interaction between adsorbed H (H∗) and sulfur leads to the unfavorable hydrogen desorption properties of considerable TTMC. Herein, we constructed the hierarchical hollow NiCo 2 S 4 nanotube@NiCo 2 S 4 nanosheet arrays on Ni foam substrate (NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF) by ion-exchange method. Homogeneous anion diffusion facilitates the formation of regular ultrathin nanosheets on hollow NiCo 2 S 4 nanotube arrays, which presents hierarchical architecture with more surface area and channels to active site exposure, electrolyte diffusion, and gas desorption for HER. As-synthesized optimal NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF electrode demonstrates an excellent HER activity, especially an overpotential of 221 mV, a Tafel slope of 108 mV dec−1, and remarkable stability at current densities of 100 mA cm−2 in 1.0 M NaOH electrolyte. • Hierarchical hollow NT-NiCo 2 S 4 @NS-NiCo 2 S 4 arrays supported on nickel foam were synthesized by ion-exchange method. • Hierarchical structure assembled from TTMC can facilitate active sites accessibility and hydrogen desorption properties. • The optimized NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF-1.0 exhibited an overpotential of 221 mV at 100 mA/cm2 and persistent stability. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Ternary transition metal chalcogenide (TTMC) with multicomponent, different phases and unique electronic structures have been studied in electrocatalytic hydrogen evolution reaction (HER). However, the strong interaction between adsorbed H (H∗) and sulfur leads to the unfavorable hydrogen desorption properties of considerable TTMC. Herein, we constructed the hierarchical hollow NiCo 2 S 4 nanotube@NiCo 2 S 4 nanosheet arrays on Ni foam substrate (NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF) by ion-exchange method. Homogeneous anion diffusion facilitates the formation of regular ultrathin nanosheets on hollow NiCo 2 S 4 nanotube arrays, which presents hierarchical architecture with more surface area and channels to active site exposure, electrolyte diffusion, and gas desorption for HER. As-synthesized optimal NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF electrode demonstrates an excellent HER activity, especially an overpotential of 221 mV, a Tafel slope of 108 mV dec−1, and remarkable stability at current densities of 100 mA cm−2 in 1.0 M NaOH electrolyte. • Hierarchical hollow NT-NiCo 2 S 4 @NS-NiCo 2 S 4 arrays supported on nickel foam were synthesized by ion-exchange method. • Hierarchical structure assembled from TTMC can facilitate active sites accessibility and hydrogen desorption properties. • The optimized NT-NiCo 2 S 4 @NS-NiCo 2 S 4 /NF-1.0 exhibited an overpotential of 221 mV at 100 mA/cm2 and persistent stability. [ABSTRACT FROM AUTHOR]
ISSN:03603199
DOI:10.1016/j.ijhydene.2022.09.020