Song Long, Luo Qiang, Zhao Fei, Li Yang, Lin Hong, Qu Liangti, Zhang Zhipan
Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectric/Electrophotonic Conversion Materials, School of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China.
Phys Chem Chem Phys. 2014 Oct 21;16(39):21820-6. doi: 10.1039/c4cp03443k. Epub 2014 Sep 9.
A series of nitrogen-doped porous graphene foams (NPGFs) have been prepared by hydrothermally treating a mixed solution of graphite oxide (GO) and ammonia. The NPGFs are used as the counter electrode (CE) material for dye-sensitized solar cells (DSCs) in conjunction with the conventional iodide-based electrolyte and the recently developed sulfide-based electrolyte. Tafel-polarization tests and electrochemical impedance spectroscopic (EIS) measurements confirmed that the NPGFs work efficiently in both electrolyte systems, and under air mass (AM) 1.5G 100 mW cm(-2) light illumination, optimal efficiencies of 4.5% and 2.1% were obtained for the iodide-based electrolyte and sulfide-based electrolyte, respectively. To the best of our knowledge, this is the first study on N-doped graphene CEs in conjunction with sulfide-based electrolytes and therefore, the current results are deemed to provide new insights into developing novel low-cost and metal-free CEs for DSCs.
通过对氧化石墨（GO）和氨的混合溶液进行水热处理，制备了一系列氮掺杂多孔石墨烯泡沫（NPGFs）。NPGFs与传统的基于碘化物的电解质以及最近开发的基于硫化物的电解质一起用作染料敏化太阳能电池（DSCs）的对电极（CE）材料。塔菲尔极化测试和电化学阻抗谱（EIS）测量证实，NPGFs在两种电解质体系中均能高效工作，并且在空气质量（AM）1.5G、100 mW cm(-2)光照条件下，基于碘化物的电解质和基于硫化物的电解质分别获得了4.5%和2.1%的最佳效率。据我们所知，这是首次关于氮掺杂石墨烯对电极与基于硫化物的电解质相结合的研究，因此，目前的结果被认为为开发用于DSCs的新型低成本无金属对电极提供了新的见解。
