Nano-Micro Letters

High-Index-Faceted Ni3S2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting

Shengjue Deng1, ‡, Kaili Zhang1, ‡, Dong Xie2, Yan Zhang1, Yongqi Zhang3, Yadong Wang4, Jianbo Wu5, Xiuli Wang1, Hong Jin Fan3, Xinhui Xia1, *, Jiangping Tu1, *

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Nano-Micro Lett. (2019) 11: 12

First Online: 05 February 2019 (Article)

DOI:10.1007/s40820-019-0242-8

*Corresponding author. E-mail: helloxxh@zju.edu.cn (Xinhui Xia); tujp@zju.edu.cn (Jiangping Tu)

 

Abstract

 


Figure description XXX

For efficient electrolysis of water for hydrogen generation or other value-added chemicals, it is highly relevant to develop low-temperature synthesis of low-cost and high-efficiency metal sulfide electrocatalysts on a large scale. Herein, we construct a new core-branch array and binder-free electrode by growing Ni3S2 nanoflake branches on an atomic-layer-deposited (ALD) TiO2 skeleton. Through induced growth on the ALD-TiO2 backbone, cross-linked Ni3S2 nanoflake branches with exposed {1} high-index facets are uniformly anchored to the preformed TiO2 coreforming an integrated electrocatalyst. Such a core-branch array structure possesses large active surface area, uniform porous structure, and rich active sites of the exposed {1} high-index facet in the Ni3S2 nanoflake. Accordingly, the TiO2@Ni3S2 core/branch arrays exhibit remarkable electrocatalytic activities in an alkaline medium, with lower overpotentials for both oxygen evolution reaction (220 mV at 10 mA cm-2) and hydrogen evolution reaction (112 mV at 10 mA cm-2), which are better than those of other Ni3S2 counterparts. Stable overall water splitting based on this bifunctional electrolyzer is also demonstrated.


 

Keywords

Nickel sulfide; Core/branch arrays; Porous film; Bifunctional electrocatalysts; Electrochemical water splitting

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