A quasi-solid-state photothermal supercapacitor via enhanced solar energy harvest
JOURNAL OF MATERIALS CHEMISTRY A(2020)
摘要
The development of flexible supercapacitors with high volumetric capacitance and energy density for outdoor wearable electronics, especially for applications in low-temperature environments, remains an urgent challenge. Here, compressible film electrodes architected by an N-doped mesoporous carbon nanosphere-intercalated 3D graphene hydrogel (N-MCN@GH) composite were developed for energy storage applications. This N-MCN@GH electrode exhibited a hierarchical porous network with a large accessible surface area for rapid electron transportation and massive ion migration via uniform N-MCN bracing in conductive graphene; therefore, it could serve as a flexible supercapacitor and deliver a total volumetric (vs. the whole device) capacitance of 8.1 F cm(-3) with a stable energy density of 1.12 mW h cm(-3) at a power density of 13.30 mW cm(-3). Very interestingly, this flexible N-MCN@GH electrode showed enhanced solar absorption and could achieve efficient solar-thermal conversion for the prevention of capacitance decay under low temperature environmental conditions. Additionally, the packaging of the photothermal supercapacitor in a transparent PET membrane preserved its enhanced photothermal capacitance performance. This work provides an innovative strategy to obtain flexible supercapacitors for practical applications and also initiates a new concept for optical/temperature sensing devices.
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