Correlating the morphological changes to electrochemical performance during carbon corrosion in polymer electrolyte fuel cells

Saha, Prantik; Khedekar, Kaustubh; Wang, Hanson; Atanassov, Plamen; Cheng, Lei; Stewart, S. Michael; Johnston, Christina; Zenyuk, Iryna V.

doi:10.1039/d2ta02666j

Cited by 16 publications

(24 citation statements)

References 56 publications

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“…suitable to study C‐corrosion, recommended by various standards and agencies such as DOE and FCCJ (Fuel Cell Commercialization Conference of Japan) are available. Compared to the potential cycling AST, start/stop cycling is shown to cause substantial C‐corrosion [118–123] . The measurement of actual carbon loss and the evaluation of PEMC performance degradation (current density reduction and ECSA loss) were typically followed in the different AST protocols [112,121,124] .…”

Section: Fuel Cellsmentioning

confidence: 99%

“…The overpotential rise was kinetic and primarily ascribed to the ECSA loss as calculated from CV (Figure 9c and 9d). Figure 9e and 9f demonstrate the pore size (diameter) distribution and pore‐space tortuosity [123] …”

Section: Fuel Cellsmentioning

confidence: 99%

“…Compared to the potential cycling AST, start/stop cycling is shown to cause substantial Ccorrosion. [118][119][120][121][122][123] The measurement of actual carbon loss and the evaluation of PEMC performance degradation (current density reduction and ECSA loss) were typically followed in the different AST protocols. [112,121,124] Distribution of relaxation time (DRT) investigation showed that the degradation behaviours vary with the type of AST used.…”

Section: Carbon Corrosionmentioning

confidence: 99%

“…Figure 9e and 9f demonstrate the pore size (diameter) distribution and pore-space tortuosity. [123] C-corrosion induced heterogeneity of CCL was studied in several works. [148] The reduction in the CL thickness associated with the C-corrosion was mainly attributed to the decreased CL porosity and the CL compaction.…”

Section: Mechanismmentioning

confidence: 99%

“…[142] Several design approaches were put forward for water management, including innovative parallel flow field on the cathode with exterior two- In-and through-planes pore space tortuosity. [123] Reproduced from Ref. [123].…”

Section: Design Modificationsmentioning

confidence: 99%

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Corrosion and Materials Degradation in Electrochemical Energy Storage and Conversion Devices

Saji

2023

ChemElectroChem

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Research and development on electrochemical energy storage and conversion (EESC) devices, viz. fuel cells, supercapacitors and batteries, are highly significant in realizing carbon neutrality and a sustainable energy economy. Component corrosion/ degradation remains a major threat to EESC device's long-term durability. Here, we provide a comprehensive account of the EESC device's corrosion and degradation issues. Discussions are mainly on polymer electrolyte membrane fuel cells, metal-ion and metal-air batteries and supercapacitors. Corrosion of bipolar plates/current collectors, carbon corrosion, electrode/ electrocatalyst degradation, and various mitigation approaches are detailed. The collective information provided could help develop EESC devices with better durability.

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Section: Fuel Cellsmentioning

confidence: 99%

Section: Fuel Cellsmentioning

confidence: 99%

Section: Carbon Corrosionmentioning

confidence: 99%

Section: Mechanismmentioning

confidence: 99%

Section: Design Modificationsmentioning

confidence: 99%

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Corrosion and Materials Degradation in Electrochemical Energy Storage and Conversion Devices

Saji

2023

ChemElectroChem

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It's time for an update—A perspective on fuel cell electrodes

Lee

2023

Can J Chem Eng

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Hydrogen fuel cell technology is gaining significant attention as a promising alternative for decarbonizing automotive vehicles. At the heart of hydrogen fuel cell technology is the electrode, composed of catalysts, supports, binders, and pores, which facilitates the half‐cell reactions and often governs the efficiency of fuel cells. Over the last decade, scientists have made great strides in discovering catalyst, support, and binder materials featuring unique nanostructures and compositions that significantly enhance the efficiency of those devices. While innovations must continue, we must not overlook how these materials are put together to form an electrode and how it impacts the overall efficiency. This perspective article discusses the urgent need for developing alternative electrodes for designing next generation hydrogen fuel cells.

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Unveiling Local Aging Patterns Following Accelerated Stress Testing of High‐Performance Polymer Electrolyte Fuel Cells

Sharma,

Cheng,

Aaron

et al. 2023

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This study presents an in‐depth analysis of heterogeneous aging patterns in membrane electrode assemblies (MEAs) subjected to diverse accelerated stress test (AST) conditions, simulating carbon corrosion (CC AST) and Pt particle size growth in fully humidified (Pt AST‐Wet) and underhumidified (Pt AST‐Dry) H2/N2 atmospheres. Multimodal characterization techniques are used to focus on heterogeneous aging patterns, primarily examining the variations in current distributions and Pt particle size maps. The findings reveal distinct characteristics of current distributions for all the AST cases, with substantial changes and strong current gradients in the CC AST case, indicative of severe performance degradation. Notably, despite significant differences in Pt particle size growth at the end‐of‐life (EOL), the Pt AST‐Wet and Pt AST‐Dry cases show minor changes in spatial current distributions. Moreover, a preferential growth of Pt particles under serpentine flow field bends in the Pt AST‐Wet case is observed for the first time. This study provides crucial insights into the role of mass transport properties in shaping fuel cell performance, and highlights the need to consider factors beyond electrochemically‐active surface area (ECSA) when assessing fuel cell durability.

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Correlating the morphological changes to electrochemical performance during carbon corrosion in polymer electrolyte fuel cells

Abstract: A mechanistic understanding of carbon corrosion in polymer electrolyte fuel cells (PEFC) is critical to design durable catalyst layers. Uncontrolled startup and shutdown of PEFCs cause electrochemical oxidation of carbon,...

Cited by 16 publications

References 56 publications

Corrosion and Materials Degradation in Electrochemical Energy Storage and Conversion Devices

Corrosion and Materials Degradation in Electrochemical Energy Storage and Conversion Devices

It's time for an update—A perspective on fuel cell electrodes

Unveiling Local Aging Patterns Following Accelerated Stress Testing of High‐Performance Polymer Electrolyte Fuel Cells

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