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Solar thermal-driven capacitance enhancement of supercapacitors


Solar energy is a renewable and abundant energy source that has myriad potential applications to be tapped. Energy storage devices often present diminishing performance at lower temperatures, sometimes they even fail during cold weathers, therefore a renewable technology to spur such sluggish performance not only is important for a sustainable future but also may inspire new-concept devices such as ignition sensors. Here, under solar illumination, the capacitance, energy density and power density of supercapacitors are all largely enhanced owing to the photothermal effect. The supercapacitors employ three-dimensional hierarchical graphene as the electrodes, and show an absorption of >92.88% over the entire solar spectrum, a response time of < 200 s, and a surface temperature change of ~39 ℃ under 1 solar illumination (1 kW m-2). Under 1 solar illumination, the capacitance of the pseudocapacitor increases by ~1.5 times, and the capacitance of the electric double-layer capacitor increases by ~3.7 times. The mechanism is quantitatively analyzed and discussed. This work provides new insights for the applications of solar energy and offers new design options for the development of energy storage devices.

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Publication details

The article was received on 27 Apr 2018, accepted on 13 Jun 2018 and first published on 14 Jun 2018

Article type: Communication
DOI: 10.1039/C8EE01244J
Citation: Energy Environ. Sci., 2018, Accepted Manuscript
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    Solar thermal-driven capacitance enhancement of supercapacitors

    F. Yi, H. Ren, K. Dai, X. Wang, Y. Han, K. Wang, K. Li, B. Guan, J. Wang, M. Tang, J. Shan, H. Yang, M. Zheng, Z. You, D. Wei and Z. Liu, Energy Environ. Sci., 2018, Accepted Manuscript , DOI: 10.1039/C8EE01244J

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