Enhanced Solar‐Driven‐Heating and Tough Hydrogel Electrolyte by Photothermal Effect and Hofmeister Effect. Issue 44 (13th October 2020)

• Record Type: Journal Article
• Authors: Wei, Junjie; Wei, Gumi; Wang, Zhipeng; Li, Wenjun; Wu, Dongbei; Wang, Qigang
• Is Part Of: Small. Volume 16:Issue 44(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-10-13
• Subjects: Hofmeister effect -- hydrogel electrolytes -- mechanical reliability -- photothermal effect -- solar‐driven‐heating; Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.202004091
• Languages: English
• ISSNs: 1613-6810

Abstract

Abstract: Although plenty of progress and achievements are made on hydrogel electrolyte researches, the inherent inferior low‐temperature performance of hydrogel electrolyte is still a severe challenge for wider application on the energy storage devices, due to the high content of water within hydrogel. Herein, an enhanced solar‐driven‐heating composite hydrogel electrolyte and a solar‐driven‐heating graphene based micro‐supercapacitor are developed utilizing the photothermal conversion ability and self‐initiation of MoS2 nanosheets and additional Hofmeister effect. The MoS2 composite hydrogel electrolyte not only improves the reliability of micro‐supercapacitor owing to its splendid mechanical properties, but also endows the micro‐supercapacitor with superior low‐temperature electrochemical performance and broadens its operating environment to a much lower temperature (−56 °C), which should be attributed to the excellent ability in converting endless solar energy into required thermal energy. These efforts would construct a new application platform for solar energy conversion and present an efficient method to structure severe‐cold resistant solid state energy storage devices for next‐generation. Abstract : The solar‐driven‐heating tough MoS2 composite hydrogel electrolyte and graphene based micro‐supercapacitor are developed utilizing the photothermal effect of nanosheets. The dual photothermal effect from electrolyte and electrode endows the micro‐supercapacitor with an outstanding improvement on low‐temperature performance under solar illumination. Furthermore, the micro‐supercapacitor also possesses excellent mechanical properties benefited from Hofmeister effect, which ensures its mechanical reliability.