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What about electrochemical behaviors for aurivillius-phase bismuth tungstate? Capacitive or pseudocapacitive
Ist Teil von
Physical chemistry chemical physics : PCCP, 2023-06, Vol.25 (25), p.16718-16726
Ort / Verlag
England: Royal Society of Chemistry
Erscheinungsjahr
2023
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Researchers mainly explore the mechanism of pseudocapacitance through studying electrode materials with Faraday pseudocapacitive behavior. Here, we found that Bi
2
WO
6
, a typical Aurivillius phase material with pseudo-perovskite structure, showed nearly ideal pseudocapacitive behavior. The cyclic voltammetry curve is approximately rectangular in shape, with no redox peaks, which is similar to that of carbon materials. And the shape of the galvanostatic charge-discharge curve is close to an isosceles triangle. In addition, the kinetic analysis demonstrated that the electrochemical process of the A-Bi
2
WO
6
electrode is dominated by surface processes, not diffusion. The A-Bi
2
WO
6
electrode material presents a great volumetric specific capacitance of 466.5 F cm
−3
at 0.5 A g
−1
. These electrochemical properties confirm that the Bi
2
WO
6
material can serve as an ideal support material to explore pseudocapacitive energy storage. This work also provides guidance for the development of new pseudocapacitive materials.
Aurivillius-phase Bi
2
WO
6
shows pseudocapacitive behavior, has great volumetric specific capacitance, and can be used as the carrier material for pseudocapacitive theoretical research and also expand the system of pseudocapacitive materials.