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Direct Storage of Holes in Ultrathin Ni(OH)2 on Fe2O3 Photoelectrodes for Integrated Solar Charging Battery-type Supercapacitors

Abstract

Energy storage is very significant for utilization of solar energy due to its discontinuous and unstable energy flux. Here, for the first time, we propose a Fe2O3@Ni(OH)2 core shell nanorod array as a photoelectrochemical battery-type supercapacitor for direct solar energy storage. Under light illumination, Fe2O3 absorbs solar energy and produce electron-hole pairs, and Ni(OH)2 stores the photo-generated holes, which can be released as electricity energy when the light is off. In addition, by controlling valence band position of a semiconductor and the thickness of Ni(OH)2, water oxidation side reaction (electrolyte decomposition), which is harmful for the applications of a photoelectrochemical supercapacitor, can be completely suppressed. As a consequence, a high specific capacitance of a Fe2O3@Ni(OH)2 photoelectrochemical supercapacitor is up to 20.6 mF/cm2 at discharge current density of 0.1 mA/cm2, which is about 4.5 times as that of BiVO4/PbOx in previous study. This study offers a very promising device for direct solar energy storage and deepens understanding on interface charge transfer between a photoelectrode and a battery-type capacitive material.

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Publication details

The article was received on 29 Aug 2018, accepted on 04 Oct 2018 and first published on 04 Oct 2018


Article type: Paper
DOI: 10.1039/C8TA08384C
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    Direct Storage of Holes in Ultrathin Ni(OH)2 on Fe2O3 Photoelectrodes for Integrated Solar Charging Battery-type Supercapacitors

    K. Zhu, G. Zhu, J. Wang, J. Zhu, G. Sun, Y. Zhang, P. Li, Y. ZHU, W. Luo, Z. Zou and W. Huang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA08384C

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