文献类型：期刊文献

英文题名：Metal-organic framework derived Co, N-bidoped carbons as superior electrode catalysts for quantum dot sensitized solar cells

作者：Li, Yan[1];Zhao, Leilei[1];Du, Zhonglin[1];Du, Jun[1];Wang, Wei[1];Wang, Yuan[1];Zhao, Lianjing[1];Cao, Xiao-Ming[2];Zhong, Xinhua[3]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Funct Mat Chem, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Inst Ind Catalysis, Ctr Computat Chem & Res, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]South China Agr Univ, Coll Mat & Energy, Guangzhou 510642, Guangdong, Peoples R China

年份：2018

卷号：6

期号：5

起止页码：2129

外文期刊名：JOURNAL OF MATERIALS CHEMISTRY A

收录：;EI(收录号：20180604752965);WOS:【SCI-EXPANDED(收录号:WOS:000423981200025)】；

基金：This research is supported by the National Natural Science Foundation of China (No. 21771063, 21421004 and 21673072), the State Key Research Development Program of China (No. 2016YFA0204200), and the Fundamental Research Funds for the Central Universities in China (No. WJ1714046 and 222201717003).

语种：英文

外文关键词：Density functional theory - Electrodes - Nanocomposites - Copper compounds - Crystalline materials - Efficiency - Indium compounds - Selenium compounds - Charge transfer - Electrocatalysts - Nanocrystals - Semiconductor quantum dots - Tin oxides - Catalyst activity - Zinc compounds

摘要：An efficient electrocatalyst for the reduction of polysulfide electrolytes is vital to the construction of quantum dot sensitized solar cells (QDSCs). Herein, Co, N-bidoped carbon nanomaterials, prepared simply via the pyrolysis of bimetallic (Zn and Co) zeolite-type-metal organic frameworks, were for the first time attempted as electrocatalysts to develop counter electrodes (CEs) for QDSCs. The CEs developed exhibit superior catalytic activity for polysulfide reduction in QDSCs, resulting in a low charge transfer resistance at the interface of the CE/electrolyte, an improved fill factor (FF) and a high short circuit current density (J(sc)). The outstanding performances of the CEs can be ascribed to the inherent characteristics of Co, N-bidoped carbons with homogeneously dispersed active dopants of Co and N atoms, large hydrophilic surface area, and good conductivity. Moreover, density functional theory (DFT) indicated that the Co-Nx sites would be active sites for polysulfide reduction. When Co, N-bidoped carbons deposited on F-doped tin oxide glass were used as CEs, an impressive power conversion efficiency of 9.12% (V-oc - 0.635 V, J(sc) - 26.15 mA cm(-2), FF - 0.549) under one sun illumination with 100 mW cm(-2) intensity was observed on QDSCs using Zn-Cu-In-Se QDs as sensitizers. Consequently, there is a good chance to fabricate QDSCs of high efficiency with the CEs derived from MOFs.