Heteroelement Y-doped α-Ni(OH) 2 nanosheets with excellent pseudocapacitive performance

• Published in: Journal of materials chemistry. A, Materials for energy and sustainability Vol. 5; no. 20; pp. 10039 - 10047
• Main Authors: Zhang, Yao, Zhao, Yufei, An, Weidan, Xing, Li, Gao, Yanfang, Liu, Jinrong
• Format: Journal Article
• Language: English
• Published: 01.05.2017
• Subjects: Current density; Devices; Doping; Electrodes; Electronics; Energy density; Nanostructure; Yttrium
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c7ta00963a

Doping is an efficient method to promote the electronic conductivity and improve the capacitive performance of electrodes for further energy conversion. Herein, by doping heteroelement metal ions, an ultrathin Y (yttrium)-doped alpha -Ni(OH)2 nanosheet electrode with a large surface area and hierarchical porous structure is fabricated via a facile approach. The Y-doped alpha -Ni(OH)2 nanosheets exhibit a high specific capacitance of 1860 F g-1 at a current density of 1 A g-1 mainly due to the increased electronic conductivity of the increased Ni3+ species, as evidenced by density functional theory calculations. As a result, the asymmetric supercapacitor device based on the Y-doped alpha -Ni(OH)2 nanosheet electrode demonstrates both a remarkably high energy density (58.4 W h kg-1) and power density (754.56 W kg-1).