Hierarchical VOOH hollow spheres for symmetrical and asymmetrical supercapacitor devices.

Abstract:

:Hierarchical VOOH hollow spheres with low crystallinity composed of nanoparticles were prepared by a facile and template-free method, which involved a precipitation of precursor microspheres in aqueous solution at room temperature and subsequent hydrothermal reaction. Quasi-solid-state symmetric and asymmetric supercapacitor (SSC and ASC) devices were fabricated using hierarchical VOOH hollow spheres as the electrodes, and the electrochemical properties of the VOOH//VOOH SSC device and the VOOH//AC ASC device were studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). Results demonstrated that the electrochemical performance of the VOOH//AC ASC device was better than that of the VOOH//VOOH SSC device. After 3000 cycles, the specific capacitance of the VOOH//AC ASC device retains 83% of the initial capacitance, while the VOOH//VOOH SSC device retains only 7.7%. Findings in this work proved that hierarchical VOOH hollow spheres could be a promising candidate as an ideal electrode material for supercapacitor devices.

journal_name

R Soc Open Sci

authors

Jing X,Wang C,Feng W,Xing N,Jiang H,Lu X,Zhang Y,Meng C

doi

10.1098/rsos.171768

subject

Has Abstract

pub_date

2018-01-31 00:00:00

pages

171768

issue

1

issn

2054-5703

pii

rsos171768

journal_volume

5

pub_type

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