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Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells

Ultrahigh mass transport resistance and excessive coverage of the active sites introduced by phosphoric acid (PA) are among the major obstacles that limit the performance of high-temperature polymer fuel cells, especially compared to their low-temperature counterparts. Here, an alternative strategy...

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Autores principales: Zhang, Zinan, Xia, Zhangxun, Huang, Jicai, Jing, Fenning, Zhang, Xiaoming, Li, Huanqiao, Wang, Suli, Sun, Gongquan
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9876549/
https://www.ncbi.nlm.nih.gov/pubmed/36696498
http://dx.doi.org/10.1126/sciadv.ade1194
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author Zhang, Zinan
Xia, Zhangxun
Huang, Jicai
Jing, Fenning
Zhang, Xiaoming
Li, Huanqiao
Wang, Suli
Sun, Gongquan
author_facet Zhang, Zinan
Xia, Zhangxun
Huang, Jicai
Jing, Fenning
Zhang, Xiaoming
Li, Huanqiao
Wang, Suli
Sun, Gongquan
author_sort Zhang, Zinan
collection PubMed
description Ultrahigh mass transport resistance and excessive coverage of the active sites introduced by phosphoric acid (PA) are among the major obstacles that limit the performance of high-temperature polymer fuel cells, especially compared to their low-temperature counterparts. Here, an alternative strategy of electrode design with fibrous networks is developed to optimize the redistribution of acid within the electrode. Via structural tailoring with varied electrospinning parameters, uneven migration of PA with dispersed droplets is observed, subverting the immersion model of conventional porous electrode. Combining with experimental and calculation results, the microscaled uneven PA interfaces could not only provide extra diffusion pathways for oxygen but also minimize the thickness of PA layers. This electrode architecture demonstrates enhanced electrochemical performance of oxygen reduction within the PA phase, resulting in a 28% enhancement of the maximum power density for the optimally designed electrode as cathode compared to that of a conventional one.
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spelling pubmed-98765492023-02-03 Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells Zhang, Zinan Xia, Zhangxun Huang, Jicai Jing, Fenning Zhang, Xiaoming Li, Huanqiao Wang, Suli Sun, Gongquan Sci Adv Physical and Materials Sciences Ultrahigh mass transport resistance and excessive coverage of the active sites introduced by phosphoric acid (PA) are among the major obstacles that limit the performance of high-temperature polymer fuel cells, especially compared to their low-temperature counterparts. Here, an alternative strategy of electrode design with fibrous networks is developed to optimize the redistribution of acid within the electrode. Via structural tailoring with varied electrospinning parameters, uneven migration of PA with dispersed droplets is observed, subverting the immersion model of conventional porous electrode. Combining with experimental and calculation results, the microscaled uneven PA interfaces could not only provide extra diffusion pathways for oxygen but also minimize the thickness of PA layers. This electrode architecture demonstrates enhanced electrochemical performance of oxygen reduction within the PA phase, resulting in a 28% enhancement of the maximum power density for the optimally designed electrode as cathode compared to that of a conventional one. American Association for the Advancement of Science 2023-01-25 /pmc/articles/PMC9876549/ /pubmed/36696498 http://dx.doi.org/10.1126/sciadv.ade1194 Text en Copyright © 2023 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). https://creativecommons.org/licenses/by-nc/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (https://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited.
spellingShingle Physical and Materials Sciences
Zhang, Zinan
Xia, Zhangxun
Huang, Jicai
Jing, Fenning
Zhang, Xiaoming
Li, Huanqiao
Wang, Suli
Sun, Gongquan
Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title_full Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title_fullStr Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title_full_unstemmed Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title_short Uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
title_sort uneven phosphoric acid interfaces with enhanced electrochemical performance for high-temperature polymer electrolyte fuel cells
topic Physical and Materials Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9876549/
https://www.ncbi.nlm.nih.gov/pubmed/36696498
http://dx.doi.org/10.1126/sciadv.ade1194
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