CoS nanosheets-coupled graphene quantum dots architectures as a binder-free counter electrode for high-performance DSSCs

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• 作者：Chang Yu 于畅 ; Zhiqiang Liu 刘志庿/a> ; Yiwen Chen 陈毅政/a>…
• 关键词：graphene quantum dots ; cobalt sulphide ; counter electrode ; dye ; sensitized solar cells
• 刊名：Science China Materials
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：59
• 期：2
• 页码：104-111
• 全文大小：1,547 KB
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• 作者单位：Chang Yu 于畅 (1)
  Zhiqiang Liu 刘志强 (1)
  Yiwen Chen 陈毅文 (1)
  Xiangtong Meng 孟祥桐 (1)
  Mingyu Li 李明宇 (1)
  Jieshan Qiu 邱介山 (1)
  
  1. State Key Lab of Fine Chemicals, Liaoning Key Lab for Energy Materials and Chemical Engineering, PSU-DUT Joint Center for Energy Research, Dalian University of Technology, Dalian, 116024, China
  
• 刊物类别：Materials Science, general; Chemistry/Food Science, general;
• 刊物主题：Materials Science, general; Chemistry/Food Science, general;
• 出版者：Science China Press
• ISSN：2199-4501

文摘

Hybrid materials with alternate components and synergetic effects are promising and intriguing materials as electrodes for high-performance energy storage/conversion devices. Cobalt sulphide (CoS) is one of the low-cost but inactive catalysts as counter electrode (CE) for dye-sensitized solar cells (DSSCs). How to optimize its structure and further enhance its electrochemical activity for I ₃ − reduction remains a major challenge. Herein, a simple and efficient approach has been adopted to configure CoS sheets-coupled graphene quantum dots (GQDs) architectures via electrodepositing GQDs and CoS on the fl uorine doped tin oxide glass substrate. When employed as the binder-free CE for DSSCs, the as-made CoS-GQDs exhibits a high catalytic activity towards the reduction of I ₃ − , evidenced by the results of cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. A conversion efficiency of 7.30% is achieved, being superior to CoS CE (5.55%) and Pt CE (6.94%) due to their synergetic effects. The present work provides a simple method for configuring low-cost binder-free CE materials for replacing Pt.