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Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder

Reducing the iridium catalyst loading in the anode of polymer electrolyte membrane electrolyzers is a major goal to bring down the cost. However, anodes with low Ir-loading can suffer from poor electrical connectivity and hence lower the efficiency of the electrolyzer. In this work, we replace parts...

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Autores principales: Cruz Ortiz, Edgar, Hegge, Friedemann, Breitwieser, Matthias, Vierrath, Severin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057180/
https://www.ncbi.nlm.nih.gov/pubmed/35515165
http://dx.doi.org/10.1039/d0ra06714h
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author Cruz Ortiz, Edgar
Hegge, Friedemann
Breitwieser, Matthias
Vierrath, Severin
author_facet Cruz Ortiz, Edgar
Hegge, Friedemann
Breitwieser, Matthias
Vierrath, Severin
author_sort Cruz Ortiz, Edgar
collection PubMed
description Reducing the iridium catalyst loading in the anode of polymer electrolyte membrane electrolyzers is a major goal to bring down the cost. However, anodes with low Ir-loading can suffer from poor electrical connectivity and hence lower the efficiency of the electrolyzer. In this work, we replace parts of the Nafion binder in the anode with an electrically conductive polymer (poly-3,4-ethylenedioxythiophene and polystyrene sulfonate acid complex, PEDOT:PSS) to counter this effect. At the optimal 50 : 50 blend we achieve a 120 mV lower overpotential (2.02 V) at 3 A cm(−2) compared to a pure Nafion reference (2.14 V). This corresponds to a 6% better efficiency. Ex situ resistivity measurements and high frequency resistance measurements indicate that the major cause for this improvement lies in the reduced electrical in-plane resistance due to the electrical conductivity of PEDOT:PSS.
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spelling pubmed-90571802022-05-04 Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder Cruz Ortiz, Edgar Hegge, Friedemann Breitwieser, Matthias Vierrath, Severin RSC Adv Chemistry Reducing the iridium catalyst loading in the anode of polymer electrolyte membrane electrolyzers is a major goal to bring down the cost. However, anodes with low Ir-loading can suffer from poor electrical connectivity and hence lower the efficiency of the electrolyzer. In this work, we replace parts of the Nafion binder in the anode with an electrically conductive polymer (poly-3,4-ethylenedioxythiophene and polystyrene sulfonate acid complex, PEDOT:PSS) to counter this effect. At the optimal 50 : 50 blend we achieve a 120 mV lower overpotential (2.02 V) at 3 A cm(−2) compared to a pure Nafion reference (2.14 V). This corresponds to a 6% better efficiency. Ex situ resistivity measurements and high frequency resistance measurements indicate that the major cause for this improvement lies in the reduced electrical in-plane resistance due to the electrical conductivity of PEDOT:PSS. The Royal Society of Chemistry 2020-10-14 /pmc/articles/PMC9057180/ /pubmed/35515165 http://dx.doi.org/10.1039/d0ra06714h Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by-nc/3.0/
spellingShingle Chemistry
Cruz Ortiz, Edgar
Hegge, Friedemann
Breitwieser, Matthias
Vierrath, Severin
Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title_full Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title_fullStr Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title_full_unstemmed Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title_short Improving the performance of proton exchange membrane water electrolyzers with low Ir-loaded anodes by adding PEDOT:PSS as electrically conductive binder
title_sort improving the performance of proton exchange membrane water electrolyzers with low ir-loaded anodes by adding pedot:pss as electrically conductive binder
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9057180/
https://www.ncbi.nlm.nih.gov/pubmed/35515165
http://dx.doi.org/10.1039/d0ra06714h
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