La0.5Sr0.5CoO2.91@RGO nanocomposites as an effective counter electrode for dye-sensitized solar cells
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- 作者：Kuangwei Xiong ; Zhongfei Liu ; Jiangtao Yuan…
- 刊名：Journal of Materials Science: Materials in Electronics
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：28
- 期：2
- 页码：1679-1683
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Optical and Electronic Materials; Characterization and Evaluation of Materials;
- 出版者：Springer US
- ISSN：1573-482X
- 卷排序：28
文摘
The role of the counter electrode (CE) in dye-sensitized solar cell (DSSC) is to collect electrons from the external circuit and reduce I3− to I− in the electrolyte. In this paper, the perovskite-phase La0.5Sr0.5CoO2.91 (LSCO) nanoparticles were synthesized through a sol–gel method and used as the CE for DSSC. The cell showed a power conversion efficiency (PCE) of 3.24 %. To further improve the PCE of CE of the LSCO nanoparticles, the nanocomposites of the LSCO nanoparticles with reduced graphene oxide (LSCO@RGO) have been prepared via a simply physical mixing method and served as the efficient CE for DSSC. The LSCO@RGO nanocomposites exhibit excellent electrocatalytic performance for reduction of triiodide, owing to the positive synergetic effect between LSCO nanoparticles and RGO sheets. As a consequence, the DSSC with the LSCO@RGO nanocomposites CE yielded a PCE of 6.32 %, which is observably higher than that of using pristine LSCO CE (3.24 %) or RGO CE (4.54 %) alone, and up to 88 % of the Pt CE (7.18 %).