Enhancement of electrochemical performance in supercapacitors using TiO2 nanoparticles-doped PVA-KOH gel electrolyte

IF 4.1 3区化学 Q1 CHEMISTRY, ANALYTICAL

Journal of Electroanalytical Chemistry Pub Date : 2025-02-01 DOI:10.1016/j.jelechem.2024.118886

Kwanruthai Wongsaprom , Pornchita Insee , Nattarika Boonraksa , Ekaphan Swatsitang

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Abstract

The development of PVA-KOH gel electrolytes doped with various concentrations of TiO₂ nanoparticles was investigated to enhance the electrochemical performance and stability of symmetric supercapacitors (SSCs). The optimized SSC, with 0.30 % TiO₂ doping, demonstrated superior electrochemical performance, achieving a specific capacitance of 154.33 F/g, an energy density of 23.43 Wh/kg, and power density of 1196.43 W/kg. This improvement is attributed to the ability of TiO₂ nanoparticles to inhibit polymer crystallization, thereby enhancing ionic conductivity and compatibility between the electrode and electrolyte. Electrochemical Impedance Spectroscopy (EIS) indicated reduced series resistance (R_s) and charge transfer resistance (R_ct) for the SSC with 0.30 % TiO₂, with values of 0.61 Ω and 0.39 Ω, respectively. Additionally, the SSC exhibited excellent cycling stability, retaining 100 % of its capacitance after 10,000 charge–discharge cycles at a current density of 1 A/g. These results highlight the potential of TiO₂-doped PVA-KOH gel electrolytes in developing high-performance, safe supercapacitors for a wide range of applications.

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来源期刊

Journal of Electroanalytical Chemistry 化学-电化学

CiteScore

7.80

自引率

6.70%

发文量

912

审稿时长

2.4 months

期刊介绍： The Journal of Electroanalytical Chemistry is the foremost international journal devoted to the interdisciplinary subject of electrochemistry in all its aspects, theoretical as well as applied. Electrochemistry is a wide ranging area that is in a state of continuous evolution. Rather than compiling a long list of topics covered by the Journal, the editors would like to draw particular attention to the key issues of novelty, topicality and quality. Papers should present new and interesting electrochemical science in a way that is accessible to the reader. The presentation and discussion should be at a level that is consistent with the international status of the Journal. Reports describing the application of well-established techniques to problems that are essentially technical will not be accepted. Similarly, papers that report observations but fail to provide adequate interpretation will be rejected by the Editors. Papers dealing with technical electrochemistry should be submitted to other specialist journals unless the authors can show that their work provides substantially new insights into electrochemical processes.