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제112회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Electrochemical investigation of the electrolyte with binary redox couples for high-voltage dye-sensitized solar cells (DSSCs)

2013년 8월 29일 17시 33분 05초
ELEC.O-8 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
금 12시 : 30분
전기화학 - Young Electrochemists Symposium
저자 및
NaraYan ChanDra Deb, 이재준1,*
건국대학교 나노기술연구센터, Bangladesh
1건국대학교 응용화학과, Korea
The redox electrolyte is one of the key components of the DSSC and its properties have great influence on both the efficiency and stability of the devices. The difference between the quasi-Fermi level of TiO2 photoelectrode under illumination and the redox energy level of the electrolyte is considered as the theoretical maximum value of open-circuit voltage (Voc). Since, Voc is highly dependent on the electrochemical potential of redox couple in the electrolyte, a number of redox mediators including bromine, pseudohalogens, organic redox couples, and cobalt-complex redox couples have been studied to replace I?/I3? couple for higher Voc. Meanwhile, a redox couple of more positive potential is expected to offer a larger value of Voc, none of them were successful in rivaling I?/I3? in reaching a higher photovoltaic performance mostly due to the significant retardation of dye regeneration. In this view, we have prepared and characterized a series of novel electrolytes with binary redox couples for high-voltage DSSCs. It was found that the additional interhalogen/pseudo-interhalogen based redox ion, I2Br-, I2SCN- can be formed by both chemically and electrochemically in I-/I3- based classical system. It was found to produce extra redox pairs, (I?,Br?)/I2Br?, and (I?,SCN?)/I2SCN? with new energy states at a more positive potential than that of I?/I3?. The Fermi levels of those electrolytes shifted positively by the weighted-average of the two redox systems. They induced the increase of Voc up to 30, 60, and 50 mV for N719, Ruthenizer 505, and eosin Y dyes, respectively, which, eventually, resulted in the enhancement of the overall power conversion efficiency (?) up to 8, 14, and 13%, respectively. This study offers a very promising strategy to develop a novel electrolyte of which the energy level can be controlled by introducing an additional redox species with more positive potentials without compromising the rate of regeneration of dyes.