Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Realize long term developments and practical application of the dye–sensitized solar cells (DSCs) requires a robust increase of the power conversion efficiency (PCE) and a significant decrease of the production cost. Fortunately, a new record PCE value of 12.3% was achieved by using cobalt based redox couples combined with organic dye. Evidently, dyes design is the key path to improve the PCE; while develop low–cost counter electrode (CE) catalysts is one of promising paths to reduce the production cost of DSCs by replacing the expensive Pt CE. Our group has done a systematic study on the DSCs from fundamentals to application, which included modification of photoanodes and electrolyte and development of several classes of new catalysts for counter electrodes. We also designed and fabricated several structures of DSCs, such as hybrid DSCs and tandem DSCs.
In this paper, we will report the recent progress in development of new catalysts for counter electrodes. We synthesized one-dimension tungsten oxide nanowires (NWs) with abundant surface oxygen vacant (SOV), and compared with three-dimension nanostructure, its high aspect ratio is benefitted to expose SOV in surface of nanostructure rather than embodied in bulk. By in situ filling SOV in electrodes meanwhile maintaining the crystal phase and morphology of NWs, we clearly identify how SOV of tungsten oxide catalyst govern the iodide reduction reactions in solar cell. The surface chemical and electrocatalytic result revealed that iodide reduction reaction activity is notably dependent to surface oxygen vacant of tungsten oxide catalysts, which serves as important catalytic site descriptor. In addition, we have demonstrated that the catalytic activity of carbon catalysts were higher than Pt for the regeneration of new organic redox couples. As well as, a composite catalyst of rosin carbon/Fe3O4 with marvellous morphology was also synthesized and applied as counter electrode (CE) in DSCs, demonstrating notable electrocatalytic activity for reduction of I3–. Based on this CE, a high power conversion efficiency of 8.11% was achieved, comparable to that of traditional Pt CE. In this presentation, we will discuss the advantages and disadvantages of these catalysts and put forward ideas for designing new CE catalysts in future research for DSCs and other application fields.
Fig. 1 Schematic of tungsten suboxide with oxygen vacant
References (1)Liang Wang, Yantao Shi*, Yanxiang Wang, Hong Zhang, Huawei Zhou, Ying Wei, and Tingli Ma*Chem. Commun., 2013,DOI: 10.1039/C3CC47163B (2) Liang Wang, Yantao Shi*, Xiaogong Bai, Yujin Xing, Hong Zhang, Lin Wang, Tingli Ma*,Energy & Environmental Science, 2013,DOI:10.1039/C3EE42767F (3) Jiahao Guo,Yantao Shi*, Chao Zhu, Lin Wang, Ning Wang and Tingli Ma* J. Mater. Chem. A, 2013, 1: 11874
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