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Synthesis of Free‐Standing Metal Sulfide Nanoarrays via Anion Exchange Reaction and Their Electrochemical Energy Storage Application

2013; Wiley; Volume: 10; Issue: 4 Linguagem: Inglês

10.1002/smll.201302224

1613-6829

Xinhui Xia, Changrong Zhu, Jingshan Luo, Zhiyuan Zeng, Cao Guan, C.F. Ng, Hua Zhang, Hong Jin Fan,

Electrocatalysts for Energy Conversion

Metal sulfides are an emerging class of high‐performance electrode materials for solar cells and electrochemical energy storage devices. Here, a facile and powerful method based on anion exchange reactions is reported to achieve metal sulfide nanoarrays through a topotactical transformation from their metal oxide and hydroxide pre‐forms. Demonstrations are made to CoS and NiS nanowires, nanowalls, and core‐branch nanotrees on carbon cloth and nickel foam substrates. The sulfide nanoarrays exhibit superior redox reactivity for electrochemical energy storage. The self‐supported CoS nanowire arrays are tested as the pseudo‐capacitor cathode, which demonstrate enhanced high‐rate specific capacities and better cycle life as compared to the powder counterparts. The outstanding electrochemical properties of the sulfide nanoarrays are a consequence of the preservation of the nanoarray architecture and rigid connection with the current collector after the anion exchange reactions.