Fabrication of a Hierarchical Ni(OH)2@Ni3S2/Ni Foam Electrode from a Prussian Blue Analogue‐Based Composite with Enhanced Electrochemical Capacitive and Electrocatalytic Properties. Issue 5 (9th January 2020)

• Record Type: Journal Article
• Authors: Chen, Xiaojuan; Yang, Longkun; Huang, Yunxia; Ge, Shuaipeng; Zhang, Hao; Cui, Yimin; Huang, Anping; Xiao, Zhisong
• Is Part Of: Chemistry. Volume 26:Issue 5(2020)
• Page Start: 1111
• Page End: 1116
• Publication Date: 2020-01-09
• Subjects: electrocatalysts -- electrochemistry -- hydrogen evolution reaction -- nickel -- nanostructures; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201904324
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: Developing high‐efficiency, cost‐effective, and durable electrodes is significant for electrochemical capacitors and electrocatalysis. Herein, a 3D bifunctional electrode consisting of nickel hydroxide nanosheets@nickel sulfide nanocubes arrays on Ni foam (Ni(OH)2 @Ni3 S2 /NF) obtained from a Prussian blue analogue‐based precursor is reported. The 3D higher‐order porous structure and synergistic effect of different compositions endow the electrode with large specific surface area, facile ion/electron transport path, and improved conductivity. As a result, the Ni(OH)2 @Ni3 S2 /NF electrode exhibits a high specific capacity of 211 mA h g −1 at a current density of 1 A g −1 and 73 % capacity retention after 5000 cycles at 5 A g −1 . Moreover, the Ni(OH)2 @Ni3 S2 /NF electrode has superior electrocatalytic activity for the hydrogen evolution reaction with low overpotentials of 140 and 210 mV at current densities of 10 and 100 mA cm −2, respectively. The synthetic strategy for the unique higher‐order porous structure can be extended to fabricate other composite materials for energy storage and conversion. Abstract : Bifunctional electrocatalyst : A bifunctional electrode consisting of nickel hydroxide nanosheets@nickel sulfide nanocubes arrays on Ni foam (Ni(OH)2 @Ni3 S2 /NF), which was obtained from a Prussian blue analogue‐based precursor, delivered excellent electrochemical capacitive and electrocatalytic properties in supercapacitors and the hydrogen evolution reaction, respectively (see scheme).