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Báo cáo hóa học: " Fabrication and characterization of carbon-based counter electrodes prepared by electrophoretic deposition for dye-sensitized solar cells"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Fabrication and characterization of carbon-based counter electrodes prepared by electrophoretic deposition for dye-sensitized solar cells | Kim et al. Nanoscale Research Letters 2012 7 53 http www.nanoscalereslett.eom content 7 1 53 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Fabrication and characterization of carbon-based counter electrodes prepared by electrophoretic deposition for dye-sensitized solar cells Hyunkook Kim Hyonkwang Choi Sookhyun Hwang Youngjoo Kim and Minhyon Jeon Abstract Three different carbon-based counter electrodes are investigated in light of catalytic activities such as electrochemical frequencies and interface impedances. We fabricated carbon-based counter electrodes of dye-sensitized solar cells DSSCs using graphene single-walled carbon nanotubes SWNTs and graphene-SWNT composites by electrophoretic deposition method. We observed the optical and electrochemical properties of the carbon-based counter electrodes. The DSSC with the graphene-deposited counter electrode demonstrated the best conversion efficiency of 5.87 under AM 1.5 and 1 sun condition. It could be utilized for a low-cost and high-throughput process for DSSCs. Keywords dye-sensitized solar cells counter electrodes graphene single-walled carbon nanotubes electrophoretic deposition. Introduction Dye-sensitized solar cells DSSCs have emerged as the next generation of photovoltaic devices offering several advantages including moderate light-to-electricity conversion efficiency easy fabrication and low cost 1-4 . Generally a DSSC is composed of a mesoporous nanocrystalline film normally titanium oxide to whose surface is attached a monolayer of the charge-transfer dye molecule an electrolyte containing a dissolved iodide tri-iodide redox couple and a counter electrode. The role of counter electrodes is to transfer electrons from the external circuit to the tri-iodide and iodine in the redox electrolyte 5 . Most commonly Pt counter electrodes are utilized however despite their excellent properties they suffer from several limitations e.g. difficulty in large-scale production and high .