Details

Autor(en) / Beteiligte

• Xu, Song
• Wan, Tao
• Zhou, Kai-bin
• Zhu, Guang-ming
• He, Zhi-qiang
• Huang, Hai-bo
• Zhou, Ting
• Mao, Wen-qi
• Wu, Jie-jun
• Gong, Shang-kun
• Qiao, Yan-xin

Titel

NaMnO2−x thin nanosheets assembled microspheres as electrode for aqueous asymmetric supercapacitor

Ist Teil von

• Materials research express, 2020-03, Vol.7 (3), p.035508

Ort / Verlag

Bristol: IOP Publishing

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• This study proposes MnO2 thin nanosheets assembled microspheres with oxygen vacancies and pre-insertion of Na ions (NaMnO2−x) as highly capable supercapacitor electrodes. The NaMnO2−x electrode can reach a stable potential window of 1.2 V without oxygen evolution reactions in three-electrode configuration. The voltage window of the assembled aqueous ASC device can be expanded to 2.4 V (1 M Na2SO4) by using NaMnO2−x electrode and activated carbon electrode as positive and negative electrodes, respectively. The NaMnO2−x electrode delivers a good specific capacitance of 215 F g−1 at current density of 1 A g−1. It displays high-rate capability and an excellent cycling stability, maintaining 95.5% of its initial specific capacitance at 2 A g−1 after 2500 cycles. The ASC device shows a high energy density and power density of 28.56 W h kg−1 and 1246 W kg−1, respectively, at a current density of 1 A g−1.