Heteroelement Y-doped α-Ni(OH)₂ nanosheets with excellent pseudocapacitive performance
2017
Zhang, Yao | Zhao, Yufei | An, Weidan | Xing, Li | Gao, Yanfang | Liu, Jinrong
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 α-Ni(OH)₂ nanosheet electrode with a large surface area and hierarchical porous structure is fabricated via a facile approach. The Y-doped α-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 α-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).
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