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Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells

Platinum (Pt) as the counter electrode (CE) in dye-sensitized solar cells (DSSCs) is expensive and non-optimal for cobalt(ii/iii) redox couples, which can tune and improve the performance of DSSCs, thus motivating the search for replacements of the Pt CE. Graphene nanoplatelets (GnPs) are possible a...

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Autores principales: Kim, Jae Cheon, Rahman, Md. Mahbubur, Ju, Myung Jong, Lee, Jae-Joon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2018
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080595/
https://www.ncbi.nlm.nih.gov/pubmed/35539646
http://dx.doi.org/10.1039/c8ra02668h
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author Kim, Jae Cheon
Rahman, Md. Mahbubur
Ju, Myung Jong
Lee, Jae-Joon
author_facet Kim, Jae Cheon
Rahman, Md. Mahbubur
Ju, Myung Jong
Lee, Jae-Joon
author_sort Kim, Jae Cheon
collection PubMed
description Platinum (Pt) as the counter electrode (CE) in dye-sensitized solar cells (DSSCs) is expensive and non-optimal for cobalt(ii/iii) redox couples, which can tune and improve the performance of DSSCs, thus motivating the search for replacements of the Pt CE. Graphene nanoplatelets (GnPs) are possible alternatives to Pt CEs but they are mechanically unstable as CEs due to their poor substrate adhesion. Here we report a new type of PEDOT:PSS (PP)/GnP (PPG) composite that maintains the catalytic performance of GnPs with enhanced adhesion to the substrate via a conductive PEDOT matrix. The resultant PPG exhibited extremely low charge-transfer resistance (R(ct)) compared to Pt in its role as an electrocatalyst toward a Co(bpy)(3)(2+/3+) (bpy = 2,2′-bipyridine) redox couple, and displayed extremely high electrochemical stability for Co(bpy)(3)(3+) reduction even after 1000 cycles. The inter-stacking of GnP layers between PEDOT and PSS was confirmed by XPS and Raman spectra. It helps to delocalize charges in the PEDOT backbone and rapidly transfers electrons from the external circuit to Co(bpy)(3)(3+). This reduces the R(ct) and ultimately improves the photovoltaic performance. The DSSC based on Y123 sensitizer and PPG-CE showed a higher photovoltaic performance of 8.33% than its Pt counterpart does (7.99%) under the optimized conditions.
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spelling pubmed-90805952022-05-09 Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells Kim, Jae Cheon Rahman, Md. Mahbubur Ju, Myung Jong Lee, Jae-Joon RSC Adv Chemistry Platinum (Pt) as the counter electrode (CE) in dye-sensitized solar cells (DSSCs) is expensive and non-optimal for cobalt(ii/iii) redox couples, which can tune and improve the performance of DSSCs, thus motivating the search for replacements of the Pt CE. Graphene nanoplatelets (GnPs) are possible alternatives to Pt CEs but they are mechanically unstable as CEs due to their poor substrate adhesion. Here we report a new type of PEDOT:PSS (PP)/GnP (PPG) composite that maintains the catalytic performance of GnPs with enhanced adhesion to the substrate via a conductive PEDOT matrix. The resultant PPG exhibited extremely low charge-transfer resistance (R(ct)) compared to Pt in its role as an electrocatalyst toward a Co(bpy)(3)(2+/3+) (bpy = 2,2′-bipyridine) redox couple, and displayed extremely high electrochemical stability for Co(bpy)(3)(3+) reduction even after 1000 cycles. The inter-stacking of GnP layers between PEDOT and PSS was confirmed by XPS and Raman spectra. It helps to delocalize charges in the PEDOT backbone and rapidly transfers electrons from the external circuit to Co(bpy)(3)(3+). This reduces the R(ct) and ultimately improves the photovoltaic performance. The DSSC based on Y123 sensitizer and PPG-CE showed a higher photovoltaic performance of 8.33% than its Pt counterpart does (7.99%) under the optimized conditions. The Royal Society of Chemistry 2018-05-23 /pmc/articles/PMC9080595/ /pubmed/35539646 http://dx.doi.org/10.1039/c8ra02668h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Kim, Jae Cheon
Rahman, Md. Mahbubur
Ju, Myung Jong
Lee, Jae-Joon
Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title_full Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title_fullStr Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title_full_unstemmed Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title_short Highly conductive and stable graphene/PEDOT:PSS composite as a metal free cathode for organic dye-sensitized solar cells
title_sort highly conductive and stable graphene/pedot:pss composite as a metal free cathode for organic dye-sensitized solar cells
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9080595/
https://www.ncbi.nlm.nih.gov/pubmed/35539646
http://dx.doi.org/10.1039/c8ra02668h
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