High-index-faceted Ni3S2 branch arrays as bifunctional electrocatalysts for efficient water splitting

• Main Authors: Wu, Jianbo, Wang, Xiuli, Deng, Shengjue, Zhang, Kaili, Xie, Dong, Zhang, Yongqi, Zhang, Yan, Wang, Yadong, Fan, Hong Jin, Xia, Xinhui, Tu, Jiangping
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2019
• Subjects: Nickel Sulfide; Core/branch Arrays; DRNTU::Science::Chemistry
• Online Access: https://hdl.handle.net/10356/105547; http://hdl.handle.net/10220/47822
• Institution: Nanyang Technological University

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 { 2¯10 } high-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, uniform porous structure, and rich active sites of the exposed { 2¯10 } 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.