Synthesis of self-assembly 3D porous Ni(OH)2 with high capacitance for hybrid supercapacitors. (10th April 2018)

• Record Type: Journal Article
• Authors: Liu, Fangyan; Chu, Xiang; Zhang, Haitao; Zhang, Binbin; Su, Hai; Jin, Long; Wang, Zixing; Huang, Haichao; Yang, Weiqing
• Is Part Of: Electrochimica acta. Volume 269(2018)
• Page Start: 102
• Page End: 110
• Publication Date: 2018-04-10
• Subjects: Nickel hydroxide -- Self-assembly -- Porous structure -- Electrochemical performance -- Hybrid supercapacitors; Electrochemistry -- Periodicals; Electrochemistry, Industrial -- Periodicals; 541.37
• DOI: 10.1016/j.electacta.2018.02.130
• Languages: English
• ISSNs: 0013-4686

Abstract

Abstract: Nickel hydroxide has shown extraordinary promise for hybrid supercapacitors because of the high theoretical capacity and low cost, but is usually limited by its low power density and complex synthetic process. Here, we report the design of a self-assembly three-dimensional (3D) porous Ni(OH)2 for high-performance energy storage through a simple, cost-effective, and environmentally friendly solvothermal-precipitation method. The 3D structure with interconnected network provides superior electron transportation properties, and the hierarchical porous architecture facilitates quick ion diffusion. The Ni(OH)2 obtained at 250 °C delivers a high capacitance of 2110 F g −1 at 1.0 A g −1 and a moderate cycling stability with 53% of the maximum specific capacitance over 2000 cycles at 5.0 A g −1 . Additionally, on integration of the prepared Ni(OH)2 with hierarchically porous carbons as negative electrode material, the hybrid supercapacitor device delivers a high capacitance of 115 F g −1 and a high energy density of 40.9 W h kg −1 at a power density of 405 W kg −1 . This study not only provides a simply controllable growth method of the unique self-assembly 3D porous Ni(OH)2 with high performance but also opens up a new approach to prepare various metallic oxides/hydroxides with excellent performance for highly promising practical energy-storage systems. Graphical abstract: Highlights: 3D porous Ni(OH)2 with unique structure for short ion-diffusion pathways is prepared. A simple, cost-effective, and eco-friendly solvothermal-precipitation method is adopted for the synthesis of Ni(OH)2 . The Ni(OH)2 obtained at 250 °C exhibits a maximum specific capacitance of 2110 F g −1 . The Ni(OH)2 //HPC hybrid supercapacitor cells deliver competitive energy-storage properties.