Surface-Charge-Mediated Formation of H-TiO<sub>2</sub> @Ni(OH)<sub>2</sub> Heterostructures for High-Performance Supercapacitors.

Ke, Qingqing; Guan, Cao; Zhang, Xiao; Zheng, Minrui; Zhang, Yong-Wei; Cai, Yongqing; Zhang, Hua; Wang, John · Adv Mater · 2017

basic_science · Level V

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Abstract

An electrochemically favorable Ni(OH)<sub>2</sub> with porously hierarchical structure and ultrathin nanosheets in a core-shell structure H-TiO<sub>2</sub> @Ni(OH)<sub>2</sub> is achieved through modulating the surface chemical activity of TiO<sub>2</sub> by hydrogenation, which creates a defect-rich surface of TiO<sub>2</sub> , thereby facilitating the subsequent nucleation and growth of Ni(OH)<sub>2</sub> . These configuration-tailored H-TiO<sub>2</sub> @Ni(OH)<sub>2</sub> core-shell nanowires exhibit a superior electrochemical performance and good flexibility.