High pseudocapacitance electrode enabled by heterovalent doping and surface coating for rapid charge storage

Li Yu; Zhao, Z.; Zhang, J.; Chen, Z.; Liu, X.; Wang, K.; Sobolev, A.V.; Savilov, S.V.; Chen, M.

Статья опубликована в высокорейтинговом журнале

Информация о цитировании статьи получена из Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 15 февраля 2024 г.

Авторы: Li Yu, Zhao Zhen, Zhang Jiawei, Chen Zhen, Liu Xin, Wang Kangli, Sobolev Alexey V., Savilov Serguei V., Chen Minghua
Журнал: Surface and Coatings Technology
Том: 476
Год издания: 2024
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 130169
DOI: 10.1016/j.surfcoat.2023.130169
Аннотация: With admirable energy storage kinetics and high capacitance, pseudocapacitive electrodes have been regarded as promising candidates to replace active carbon materials for next-generation supercapacitors. Unfortunately, these materials usually present lower capacitance compared to the Ni/Co-based battery-type materials, and insufficient cycling lifespans due to repeat surface redox reactions. Here, we employ Fe doping and surface coating to construct a high-capacitance robust pseudocapacitive WO3-based electrode (10-Fe-WO3/PANI). Heterovalent doping breaks the octahedral symmetry of WO3 and effectively boosts the reversible capacitance of WO3 due to Jahn-Teller distortion, creating abundant active sites for energy storage. Polyaniline (PANI) coating enhances the structural durability and ion diffusion kinetics of WO3 in the acid electrolyte, promoting long-term cycling performance. As expected, the optimized electrode can deliver a high specific capacitance of 4006 mF cm−2 at 5 mA cm−2, which is about five-fold higher than that of a pure WO3 electrode (733.7 mF cm−2) and can steadily work for 10,000 cycles without apparent capacitance decay. The full device using polypyrrole (PPy) as the cathode exhibits intriguing energy/power density and cycling lifespans, demonstrating the application potential of this material. This work may enlighten the development of cationic doping and advanced pseudocapacitive materials design in electrochemical energy storage fields.
Добавил в систему: Соболев Алексей Валерьевич

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High pseudocapacitance electrode enabled by heterovalent doping and surface coating for rapid charge storageстатья

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