Journal
SOLAR ENERGY MATERIALS AND SOLAR CELLS
Volume 192, Issue -, Pages 1-7Publisher
ELSEVIER
DOI: 10.1016/j.solmat.2018.12.011
Keywords
Electrochromic; Self-powered; Self-rechargeable; Polypyrrole
Funding
- National Natural Science Foundation of China (NSFC) [61775131, 61376009]
- Gaoyuan Discipline of Shanghai - Environmental Science and Engineering (Resource Recycling Science and Engineering)
- Program for Professor of Special Appointment (Eastern Scholar) at Shanghai Institutions of Higher Learning [2013-70]
- Shu Guang project - Shanghai Municipal Education Commission
- Shanghai Education Development Foundation [13SG55]
- Graduate Program Fund - Shanghai Polytechnic University [EGD17YJ0032]
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Polypyrrole (PPy) film doped with p-toluenesulfonate has been grown on indium doped tin oxide (ITO) coated glass by electrochemical polymerization. The PPy film, aluminum (Al) sheet and KO solution are assembled into a bi-functional electrochemical device exhibiting self-powered electrochromic device and self-rechargeable battery characteristics. As an electrochromic device, the maximum optical modulation of the PPy/Al device is 59.0% at the wavelength of 698.5 nm. The original black device will become yellow after connecting its two electrodes with a response time of 6.5 s. As a battery, the capacity of the PPy/Al device is 75.25 mAh g(-1) when it was initially discharged at a constant current density of 1.0 A g(-1). The open circuit voltage of the PPy/Al device is 0.94 V. The charging-discharging processes of the PPy/Al device accompany a clear color change. So the capacity of the PPy/Al device can be known from the color of the device. The PPy/Al device can recover its color and capacity after disconnecting its two electrodes, which is attributed to the spontaneous transformation of PPy film from its neutral state (yellow) to p-type doped state (black) by the oxidation of oxygen.
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