Photocatalytic Oxidation of Triiodide in UVA-Exposed Dye-Sensitized Solar Cells
Photocatalytic Oxidation of Triiodide in UVA-Exposed Dye-Sensitized Solar Cells
复制标题
UVA 暴露染料敏化太阳能电池中三碘化物的光催化氧化
DOI:
10.1155/2012/524590
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发表时间:
2012
影响因子:
3.2
通讯作者:
Carnie M
中科院分区:
文献类型:
--
作者:
Carnie M
UVA irradiation of glass mounted dye‐sensitized solar cells without UV filtration causes failure within 400 hours of light exposure. The failure mode is shown to relate to consumption of, which is directly related to TiO2photo‐catalysis. The onset of failure is easily determined from electrochemical impedance data where the recombination resistance of the TiO2/electrolyte back reaction drops markedly prior to the onset of degradation. At the point of complete cell failure this impedance value then dramatically increases as there is no longer an interfacial reaction possible between the TiO2and thedepleted electrolyte. Device failure is most rapid for cells under electrical load indicating that the degradation of the electrolyte is related to photogenerated hole production by excitation of the TiO2. Once depleted by UV exposure, thecan be regenerated by simple application of a reverse bias which can restore severely UV degraded devices to near original working conditions.
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