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 journalArticleResearchpeer-review

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
JournalInternational Journal of Hydrogen Energy
DOIs
StatePublished - 2019 Jan 1

Fingerprint

charcoal
water treatment
composite structures
electrode materials
Composite structures
Water treatment
Activated carbon
Graphene
graphene
counters
Electrodes
Oxides
oxides
dyes
solar cells
electrodes
composite materials
methylene blue
Composite materials
spacers

Keywords

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

Cite this

@article{e5a0ea3dd3a04f41a6308f8cb144c363,
title = "Activated charcoal and reduced graphene sheets composite structure for highly electro-catalytically active counter electrode material and water treatment",
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.",
keywords = "Activated charcoal, Dye-sensitized solar cell, Electro-photocatalysis, Reduced graphene oxide, Spacer material",
author = "Rabia Riaz and Mumtaz Ali and T. Maiyalagan and Arbab, {Alvira Ayoub} and Anjum, {Aima Sameen} and Seoyun Lee and Ko, {Min Jae} and Jeong, {Sung Hoon}",
year = "2019",
month = "1",
day = "1",
doi = "10.1016/j.ijhydene.2019.06.138",
language = "English",
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Activated charcoal and reduced graphene sheets composite structure for highly electro-catalytically active counter electrode material and water treatment. / Riaz, Rabia; Ali, Mumtaz; Maiyalagan, T.; Arbab, Alvira Ayoub; Anjum, Aima Sameen; Lee, Seoyun; Ko, Min Jae; Jeong, Sung Hoon.

In: International Journal of Hydrogen Energy, 01.01.2019.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Activated charcoal and reduced graphene sheets composite structure for highly electro-catalytically active counter electrode material and water treatment

AU - Riaz, Rabia

AU - Ali, Mumtaz

AU - Maiyalagan, T.

AU - Arbab, Alvira Ayoub

AU - Anjum, Aima Sameen

AU - Lee, Seoyun

AU - Ko, Min Jae

AU - Jeong, Sung Hoon

PY - 2019/1/1

Y1 - 2019/1/1

N2 - 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.

AB - 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.

KW - Activated charcoal

KW - Dye-sensitized solar cell

KW - Electro-photocatalysis

KW - Reduced graphene oxide

KW - Spacer material

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DO - 10.1016/j.ijhydene.2019.06.138

M3 - Article

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

SN - 0360-3199

ER -