Activated graphene nanoplatelets as a counter electrode for dye-sensitized solar cells

Jiawei Gong, Zhengping Zhou, K. Sumathy, Huojun Yang, Qiquan Qiao

Research output: Contribution to journalArticle

21 Scopus citations

Abstract

Activated graphene nanoplatelets (aGNPs) prepared by a hydrothermal method using KOH as activating agent were used as counter electrode for high efficiency dye-sensitized solar cells (DSSCs). After the KOH activation, the scanning electron microscopy image shows that aGNPs demonstrate a more curled, rough, and porous morphology which could contain both micro- and mesopores. The KOH activation changed the stacked layers of GNPs to a more crumpled and curved morphology. The microstructure of large pores significantly increased the electrode surface area and roughness, leading to the high electrocatalytic activity for triiodide reduction at the counter electrode. The DSSCs fabricated using aGNP as counter electrodes were tested under standard AM 1.5 illumination with an intensity of 91.5 mW/cm2. The device achieved an overall power conversion efficiency of 7.7%, which is comparable to the conventional platinum counter electrode (8%). Therefore, the low cost and high performance aGNP based counter electrode is a promising alternative to conventional Pt counter electrode in DSSCs.

Original languageEnglish (US)
Article number135501
JournalJournal of Applied Physics
Volume119
Issue number13
DOIs
StatePublished - Apr 7 2016

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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