Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 781, Issue -, Pages 351-356Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2018.12.100
Keywords
Photo-capacitor; Solar energy conversion; Pseudocapacitance; ZnO@NiO nanorod arrays
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Funding
- Special Foundation for Theoretical Physics Research Program of China [11847076]
- Zhejiang Provincial Natural Science Foundation of China [LQ19E020005]
- Starting Foundation of Hangzhou Dianzi University [KYS205618042]
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In this paper, bias-free solar-driven pseudocapacitors based on ZnO@O nanorod arrays had been reported, which enable the synergistic coupling of light harvesting and electrochemical storage within one single electrode. When solar-charging, ZnO/NiO PN junction served as a driving force to separate the excitons and induce electron-injection through the interface to counter electrode forming charging bias. At this bias, the OH- trapped by photoexcited holes can make redox reaction with NiO and produce electrons. As expected, under a 1-sun illumination and no external electric bias, this ZnO/NiO composite exhibits a good specific capacitance of 44.5 F g(-1) at current densities of 0.5 A g(-1) as well as a good cycling performance (99% capacity retention after 50 cycles). Additionally, the capacitance equation was derived to account for the boosted capacitance as the increased solar-charging time. These findings here suggest the potential of further developing light-induced electrical energy storage and release on demand by a one-component light-charged capacitors. (C) 2018 Elsevier B.V. All rights reserved.
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