1. Synthesis of 1D WO3 nanostructures using different capping agents for pseudocapacitor applications.
- Author
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Di, Jing, Gai, Xikun, Jamakanga, Ropafadzo, Lou, Jie, Zhu, Minzhi, Li, Yin, Yang, Ruiqin, and Ma, Qingxiang
- Subjects
NANOSTRUCTURES ,TUNGSTEN oxides ,SURFACE area ,METALLIC oxides - Abstract
To investigate the correlation between electrochemical performance and physicochemical properties, three types of 1D WO
3 nanostructures were fabricated by hydrothermal method using K2 SO4 , Na2 SO4 , and (NH4 )2 SO4 as capping agents. Hexagonal phase was obtained with the assistant of Na2 SO4 and (NH4 )2 SO4 , while monoclinic phase was developed using K2 SO4 as agent. WO3 nanostructures prepared by (NH4 )2 SO4 and Na2 SO4 exhibited superior specific capacitance (400 F/g and 388 F/g) relative to WO3 prepared by K2 SO4 (259 F/g), suggesting hexagonal phase is more suitable for energy storage. The nanostructures prepared using Na2 SO4 exhibited inferior rate performance compared with those obtained by (NH4 )2 SO4 due to low specific surface area and high crystallinity. The electrochemical performance demonstrated nanostructures prepared by (NH4 )2 SO4 was surface-controlled whereas those using Na2 SO4 and K2 SO4 were battery-type material. These findings raise the prospects of developing tungsten oxide for energy storage. [ABSTRACT FROM AUTHOR]- Published
- 2022
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