Activated charcoal and reduced graphene sheets composite structure for highly electro-catalytically active counter electrode material and water treatment

Rabia Riaz, Mumtaz Ali, T. Maiyalagan, Alvira Ayoub Arbab, Aima Sameen Anjum, Seoyun Lee, Min Jae Ko, Sung Hoon Jeong

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

In quest of finding a sustainable solution for metal-free counter electrode materials, reduced graphene oxide (rGO) is emerged as the best alternative due to its intrinsic high electrocatalytic activity. However, owing to its two-dimensional sheets like structure, there is re-stacking of rGO sheets, which reduces exposed surface area and hinders in electrolyte diffusion. To avoid these issues, activated charcoal (AC) is explored as an active spacer material between rGO sheets, for the first time. By loading an optimum concentration of AC in rGO, a high porosity, high conductivity, and high concentration of active sites were gathered in the single composite structure. Such synchronized features of the proposed composite were utilized for Pt-free counter electrode application in dye-sensitized solar cell (DSSc). The composite structure showed high electrocatalytic activity, with a low charge transfer resistance of 0.7 Ω, which is far lower than Pt and rGO (8.5 Ω and 7.5 Ω). The DSSc fabricated with optimized composite showed power conversion efficiency of 8.6%, compared to Pt-based DSSc with 7.9% efficiency. Additionally, the potential of the electrode was also tested for the electro-photocatalytic (99%) degradation of methylene blue dye from water, in 60 min. The proposed highly efficient nanocomposite structure possesses the highest efficiency as compared to other previously studied rGO based counter-electrodes.

Original languageEnglish
Pages (from-to)7751-7763
Number of pages13
JournalInternational Journal of Hydrogen Energy
Volume45
Issue number13
DOIs
StatePublished - 2020 Mar 6

Keywords

  • Activated charcoal
  • Dye-sensitized solar cell
  • Electro-photocatalysis
  • Reduced graphene oxide
  • Spacer material

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