Printable magnesium ion quasi-solid-state asymmetric supercapacitors for flexible solar-charging integrated units

Zhengnan Tian, Xiaoling Tong, Guan Sheng, Yuanlong Shao (), Lianghao Yu, Vincent Tung, Jingyu Sun (), Richard B. Kaner () and Zhongfan Liu
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Zhengnan Tian: Soochow University
Xiaoling Tong: Soochow University
Guan Sheng: King Abdullah University of Science and Technology
Yuanlong Shao: King Abdullah University of Science and Technology
Lianghao Yu: Soochow University
Vincent Tung: King Abdullah University of Science and Technology
Jingyu Sun: Soochow University
Richard B. Kaner: University of California, Los Angeles (UCLA)
Zhongfan Liu: Soochow University

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Wearable and portable self-powered units have stimulated considerable attention in both the scientific and technological realms. However, their innovative development is still limited by inefficient bulky connections between functional modules, incompatible energy storage systems with poor cycling stability, and real safety concerns. Herein, we demonstrate a flexible solar-charging integrated unit based on the design of printed magnesium ion aqueous asymmetric supercapacitors. This power unit exhibits excellent mechanical robustness, high photo-charging cycling stability (98.7% capacitance retention after 100 cycles), excellent overall energy conversion and storage efficiency (ηoverall = 17.57%), and outstanding input current tolerance. In addition, the Mg ion quasi-solid-state asymmetric supercapacitors show high energy density up to 13.1 mWh cm−3 via pseudocapacitive ion storage as investigated by an operando X-ray diffraction technique. The findings pave a practical route toward the design of future self-powered systems affording favorable safety, long life, and high energy.

Date: 2019
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DOI: 10.1038/s41467-019-12900-4

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