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Issue 44, 2017
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A photocapacitor based on organometal halide perovskite and PANI/CNT composites integrated using a CNT bridge

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Abstract

Portable electronics powered by solar cells have become popular; however, they suffer from unstable power output of solar cells under fluctuating sunlight. Photocapacitors, integrated based on solar cells for photo-electricity energy conversion and supercapacitors for energy storage, are expected to solve the abovementioned problem. Organometal halide perovskite solar cells (PSCs) have rapidly achieved a high power conversion efficiency (PCE) of 22.1%. On the other hand, polyaniline/carbon nanotube composite supercapacitors (PANI/CNT SCs) with an aqueous gel electrolyte have shown excellent energy storage performance. It's attractive to develop high-performance photocapacitors based on PSCs and PANI/CNT SCs, but is quite challenging because water from the aqueous electrolyte may get through the hydrophilic PANI/CNT to the PSCs and boost the degradation of the PSC absorber. In this study, a photocapacitor was integrated based on a PSC of CH3NH3PbI3 (MAPbI3) as an 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 the PANI/CNT electrode, this device showed a 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 conditions such as fluctuating sunlight. Photocapacitors designed in this study provide a reference for the development of high-performance photocapacitors with a large capacitance.

Graphical abstract: A photocapacitor based on organometal halide perovskite and PANI/CNT composites integrated using a CNT bridge

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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, 2017,5, 23078-23084
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    A photocapacitor based on organometal halide perovskite and PANI/CNT composites integrated using a CNT bridge

    R. Liu, C. Liu and S. Fan, J. Mater. Chem. A, 2017, 5, 23078
    DOI: 10.1039/C7TA06297D

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