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A photocapacitor based on organometal halide perovskite and PANI/CNT composites integrated using CNT bridge

Abstract

Portable electronics powered by solar cells become popular, but suffer from unstable power output of solar cells under fluctuant sunlight. Integrating solar cells for photo-electricity energy conversion and supercapacitors for energy storage, photocapacitors are expected to solve the problem. Organometal halide perovskite solar cells (PSCs) have rapidly achieved high power conversion efficiency (PCE) of 22.1%. On the other hand, polyaniline/carbon nanotube composite supercapacitors (PANI/CNT SCs) with aqueous gel electrolyte have showed excellent energy storage performance. It’s attractive to develop high-performance photocapacitors based on PSCs and PANI/CNT SCs but full of challenge, because water from aqueous electrolyte may get through hydrophilic PANI/CNT to PSCs and boost the degradation of PSC absorber. In this work, a photocapacitor was integrated based on a PSC of CH3NH3PbI3 (MAPbI3) as absorber and a PANI/CNT SC, by fabricating a CNT bridge between the PSC part and the SC part. Owing to the large pseudocapacitance and great conductivity of PANI/CNT electrode, this device showed large specific area capacitance of 422 mF cm-2 (or specific mass capacitance of 103.4 F g-1), high Coulombic efficiency of 96%, overall energy storage efficiency of 70.9%, and stable power output under complex illumination condition like fluctuant sunlight. Photocapacitors designed in this work provide a reference to develop high-performance photocapacitors with large capacitance.

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Publication details

The article was received on 19 Jul 2017, accepted on 10 Oct 2017 and first published on 10 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA06297D
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    A photocapacitor based on organometal halide perovskite and PANI/CNT composites integrated using CNT bridge

    R. Liu, C. Liu and S. Fan, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA06297D

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