Phase-pure VO2 nanoporous structure for binder-free supercapacitor performances

被引：52

作者：

Basu, Raktima ^{[1
]}

Ghosh, Subrata ^{[1
]}

Bera, Santanu ^{[2
]}

Das, A. ^{[1
]}

Dhara, S. ^{[1
]}

机构：

[1] Homi Bhabha Natl Inst, Indira Gandhi Ctr Atom Res, Surface & Nanosci Div, Kalpakkam 603102, Tamil Nadu, India

[2] Homi Bhabha Natl Inst, Water & Steam Chem Div, BARC Facil, Kalpakkam 603102, Tamil Nadu, India

来源：

SCIENTIFIC REPORTS | 2019年 / 9卷 / 1期

关键词：

SHELL NANOWIRE ARRAYS; ALL-SOLID-STATE; INSULATOR-TRANSITION; VANADIUM NITRIDE; GRAPHENE OXIDE; CARBON; FIBER; ELECTRODE; COMPOSITE; METAL;

D O I：

10.1038/s41598-019-40225-1

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Vanadium oxides are anticipated as a high-performance energy storage electrode due to their coupled double layer and pseudo-capacitative charge storage mechanism. In the present work, we investigated the influence of different structural phases of as-grown VO2 nanoporous structure and corresponding oxidation states on the supercapacitor performance. This nanoporous structure facilitates fast ion diffusion and transport. It is shown that stoichiometric monoclinic VO2, with V oxidation state of +4, provides superior charge storage capacity with a capacitance value of 33 mF/cm(2), capacitance retention of 93.7% and Coulombic efficiency of 98.2%, to those for VO2 structures with mixed oxidation states of V5+ and V4+. A comparable high energy density is also recorded for the sample with all V4+. Scanning Kelvin probe microscopy results clarify further the formation of space charge region between VO2 and carbon paper. These key findings indicate the potentiality of binder-free single phase monoclinic VO2 porous structure towards the next-generation micro-supercapacitor application.

引用

页数：11

共 53 条

[1] Titanium vanadium nitride electrode for micro-supercapacitors [J].