Journal
JOURNAL OF POWER SOURCES
Volume 248, Issue -, Pages 434-438Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2013.09.094
Keywords
PVDF film; Dye-sensitized solar cells; Energy storage; Self-charging
Funding
- US National Institute of Health [1DP2OD008678]
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To study the fundamental energy storage mechanism of photovoltaically self-charging cells (PSCs) without involving light-responsive semiconductor materials such as Si powder and ZnO nanowires, we fabricate a two-electrode PSC with the dual functions of photocurrent output and energy storage by introducing a PVDF film dielectric on the counterelectrode of a dye-sensitized solar cell. A layer of ultrathin Au film used as a quasi-electrode establishes a shared interface for the I-/I-3(-) redox reaction and for the contact between the electrolyte and the dielectric for the energy storage, and prohibits recombination during the discharging period because of its discontinuity. PSCs with a 10-nm-thick PVDF provide a steady photocurrent output and achieve a light-to-electricity conversion efficiency (eta) of 3.38%, and simultaneously offer energy storage with a charge density of 1.67 C g(-1). Using this quasi-electrode design, optimized energy storage structures may be used in PSCs for high energy storage density. (C) 2013 Elsevier B.V. All rights reserved.
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