Details

Autor(en) / Beteiligte

• Song, Ziyang
• Duan, Hui
• Zhu, Dazhang
• Lv, Yaokang
• Xiong, Wei
• Cao, Tongcheng
• Li, Liangchun
• Liu, Mingxian
• Gan, Lihua

Titel

Ternary-doped carbon electrodes for advanced aqueous solid-state supercapacitors based on a "water-in-salt" gel electrolyte

Ist Teil von

• Journal of materials chemistry. A, Materials for energy and sustainability, 2019, Vol.7 (26), p.1581-15811

Ort / Verlag

Cambridge: Royal Society of Chemistry

Erscheinungsjahr

2019

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The key concern in constructing high-energy supercapacitors is maximizing the electrode capacitance and the cell voltage. However, the current research usually addresses this issue by designing advanced electrodes or seeking high-potential electrolytes separately, instead of both. Herein, we demonstrate a two-pronged design of ternary-doped carbon electrodes and a high-voltage "water-in-salt" (WIS) gel electrolyte to support advanced aqueous-based solid-state supercapacitors. The fabrication of N/S/O multidoped carbons is quite straightforward, involving a facile benzoquinone/sulfourea polymerization and a common carbonization/activation procedure, which avoid sophisticated technique/conditions and/or time-consuming synthetic routes. The carbons feature an extraordinary surface area, high content of heteroatoms, and improved surface wettability. A highly porous gel polymer is introduced as a supporting matrix for the WIS to design a 2.3 V gel-type electrolyte, in pursuit of a new record high-energy aqueous solid-state supercapacitor of 37.7 W h kg −1 , with excellent temperature robustness in the range of 0-80 °C. Furthermore, an assembled flexible device delivers a stable energy output of 34.3 W h kg −1 and demonstrates great flexibility with 91.6% energy retention even in a bending state of 180°. This study presents an electrode/electrolyte cooperative effect to unlock the energy potential of aqueous flexible solid-state supercapacitors. N, O and S ternary-doped carbon electrodes and a 2.3 V "water-in-salt" gel electrolyte are collaboratively designed for fabricating exceptional aqueous solid-state supercapacitors.