High-Index-Faceted Ni 3 S 2 Branch Arrays as Bifunctional Electrocatalysts for Efficient Water Splitting
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ARTICLE
Cite as Nano-Micro Lett. (2019) 11:12 Received: 15 December 2018 Accepted: 14 January 2019 © The Author(s) 2019
https://doi.org/10.1007/s40820-019-0242-8
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 * Shengjue Deng and Kaili Zhang contributed equally to this work. * Xinhui Xia, [email protected]; Jiangping Tu, [email protected] State Key Laboratory of Silicon Materials, Key Laboratory of Advanced Materials and Applications for Batteries of Zhejiang Province, and Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, People’s Republic of China
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Guangdong Engineering and Technology Research Center for Advanced Nanomaterials, School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan 523808, People’s Republic of China School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore School of Engineering, Nanyang Polytechnic, Singapore 569830, Singapore Zhejiang Provincial Key Laboratory for Cutting Tools, Taizhou University, Taizhou 318000, People’s Republic of China
HIGHLIGHTS • TiO2@Ni3S2 core/branch arrays are constructed via a low-temperature sulfurization.
̄ } high-index facet of Ni3S2 is exposed for both oxygen evolution reaction (OER) and hydrogen evolution reaction (HER). • Highly active { 210 • Remarkable bifunctional electrocatalytic activity is observed for both HER and OER. ABSTRACT For efficient electrolysis of water for hydrogen generation or other valueadded chemicals, it is highly relevant to develop low-temperature synthesis of low-cost
Branched Ni3S2 arrays H2
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
H2
on an atomic-layer-deposited (ALD) T iO2 skeleton. Through induced growth on the
̄ } high i3S2 nanoflake branches with exposed { 210 ALD-TiO2 backbone, cross-linked N index facets are uniformly anchored to the preformed TiO2 core forming an integrated
electrocatalyst. Such a core–branch array structure possesses large active surface area,
H2
̄ } high-index facet in uniform porous structure, and rich active sites of the exposed { 210 iO2@Ni3S2 core/branch arrays exhibit remarkthe Ni3S2 nanoflake. Accordingly, the T
able 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. Sta-
H2
O2
O2
O2
ble overall water splitting based on this bifunctional electrolyzer is also demonstrated.
KEYWORDS Nickel sulfide; Core/branch arrays; Porous film; Bifunctional electrocatalysts; Electrochemical water splitting; Oxygen evoluti
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