Výsledky vyhledávání - "Jonathan Braaten"

Effect of Commercial Gas Diffusion Layers on Catalyst Durability of Polymer Electrolyte Fuel Cells in Varied Cathode Gas Environment

Autor: Kaustubh Khedekar, Pongsarun Satjaritanun, Sarah Stewart, Jonathan Braaten, Plamen Atanassov, Nobumichi Tamura, Lei Cheng, Christina M. Johnston, Iryna V. Zenyuk

Publikováno v: Small (Weinheim an der Bergstrasse, Germany), vol 18, iss 33

Gas diffusion layers (GDLs) play a crucial role in heat transfer and water management of cathode catalyst layers in polymer electrolyte fuel cells (PEFCs). Thermal and water gradients can accelerate electrocatalyst degradation and therefore the selec

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::931cda338a0fddd80fb294f9d8e20b1c
https://pubmed.ncbi.nlm.nih.gov/35871500

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Spatially Resolved Heterogeneous Electrocatalyst Degradation in Polymer Electrolyte Fuel Cells Subjected to Accelerated Aging Conditions

Autor: Preetam Sharma, Bapi Bera, Douglas Aaron, Muenir Mustafa Besli, Saravanan Kuppan, Lei Cheng, Jonathan Braaten, Nathan Craig, Sarah Stewart, Michael Metzger, Christina Johnston, Matthew M. Mench

Publikováno v: Journal of The Electrochemical Society. 169:114506

This work quantifies in-plane spatial heterogeneity (polymer electrolyte fuel cell cathode inlet vs outlet) in Pt particle size growth and distribution as a function of nitrogen (N2) flow rate during a square-wave accelerated stress test (AST). The a

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::73a18b4d811179637a5826f35bac4b1d
https://doi.org/10.1149/1945-7111/ac9ee5

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Evaluation of High Oxygen Permeability Ionomer (HOPI) Oxygen Permeability for Proton Exchange Membrane Fuel Cells (PEMFCs)

Autor: Jiawei Liu, Jonathan Braaten, Nicholas Tiwari, Xiaoxiao Wang, Scott Blackburn, Gerald Brown, Andrew M Park, Zachary Ulissi, Shawn Litster

Publikováno v: ECS Meeting Abstracts. :1514-1514

The performance of proton exchange membrane fuel cells (PEMFCs) is sensitive to Pt loading in the cathode catalyst layer, with lower Pt loadings significantly increasing the oxygen transport resistance of the catalyst-ionomer interface when using per

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a9e13717883fd47274e79abc0ce15b01
https://doi.org/10.1149/ma2022-02411514mtgabs

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Localized Electrochemical Performance Degradation in Polymer Electrolyte Fuel Cells (PEFCs)

Autor: Preetam Sharma, Douglas Aaron, Lei Cheng, Jonathan Braaten, Nathan Craig, Christina Johnston, Matthew M Mench

Publikováno v: ECS Meeting Abstracts. :1571-1571

Pt electrocatalyst durability in polymer electrolyte fuel cells (PEFCs) is generally evaluated through an accelerated stress test (AST); for example, one AST features repeated square-wave cycling with H2/N2 between 0.6 V to 0.95 V vs. reversible hydr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7a6a44b6f447bcd4f829752a7543a178
https://doi.org/10.1149/ma2022-02421571mtgabs

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Single Cobalt Sites Dispersed in Hierarchically Porous Nanofiber Networks for Durable and High-Power PGM-Free Cathodes in Fuel Cells

Autor: Maoyu Wang, David A. Cullen, Jonathan Braaten, Stavros Karakalos, Weitao Shan, Hui Guo, Xiaoxuan Yang, Zhenxing Feng, Ling Fei, Sooyeon Hwang, Guofeng Wang, Dong Su, Hua Zhou, Gang Wu, Zizhou He, Karren L. More, Shawn Litster, Yanghua He

Publikováno v: Advanced materials (Deerfield Beach, Fla.). 32(46)

Increasing catalytic activity and durability of atomically dispersed metal-nitrogen-carbon (M-N-C) catalysts for the oxygen reduction reaction (ORR) cathode in proton-exchange-membrane fuel cells remains a grand challenge. Here, a high-power and dura

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::74a5fb7bb664fef4ef0d781be5a8bb8b
https://pubmed.ncbi.nlm.nih.gov/33058263

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