Fabrication of Amorphous Mesoporous Ni(OH)2 Hollow Spheres with Waxberry‐Like Morphology for Supercapacitor Electrodes. Issue 9 (8th June 2017)

• Record Type: Journal Article
• Authors: Zhou, Cong; Lin, Lina; Ma, Yuzhu; Huang, Liyan; Li, Jun; Liu, Zhengping; Dong, Zhaoxia
• Is Part Of: ChemElectroChem. Volume 4:Issue 9(2017)
• Page Start: 2314
• Page End: 2320
• Publication Date: 2017-06-08
• Subjects: nickel hydroxide -- hollow spheres -- waxberry-like morphology -- amorphous -- supercapacitors; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201700306
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: The amorphous mesoporous Ni(OH)2 hollow spheres (Ni(OH)2 ‐HSs) with waxberry‐like morphology were fabricated by using a facile hydrothermal method with poly(styrene‐acrylic acid) spheres as the template, followed by extraction of the template. In the hydrothermal process, Ni(NO3 )2 ⋅6H2 O was employed as the precursor of Ni(OH)2 . SEM, TEM, XPS, XRD, and N2 adsorption‐desorption isotherm techniques were used to characterize the structure and morphology of Ni(OH)2 ‐HSs. The obtained Ni(OH)2 ‐HSs have a uniform morphology with an average diameter of 300 nm and shell thickness of about 25 nm. The mesoporous shells of the Ni(OH)2 ‐HSs are composed of amorphous Ni(OH)2 particles. When used as an electrode, the as‐prepared Ni(OH)2 ‐HSs exhibit pseudocapacitive behavior with a high specific capacitance of 2559 F g −1 at a scan rate of 1 mV s −1 and a good capacitance retention of 91.8% after 1000 cycles at a current density of 5 A g −1 . These results suggest promising applications of the waxberry‐like amorphous Ni(OH)2 hollow spheres in electrode materials for supercapacitors. Abstract : Caps off : Amorphous mesoporous Ni‐(OH)2 hollow spheres (Ni‐(OH)2 ‐HSs) with a waxberry‐like morphology are fabricated through a facile hydrothermal method by using poly‐(styrene‐acrylic acid) spheres as a template, followed by extraction of the template. When used as an electrode, the as‐prepared Ni‐(OH)2 ‐HSs exhibit pseudocapacitive performances with a high specific capacitance and a good capacitance retention. These results suggest promising applications of the waxberry‐like amorphous Ni‐(OH)2 hollow spheres in electrode materials for supercapacitors.