Unusual influence of binder composition and phosphoric acid leaching on oxygen mass transport in catalyst layers of high-temperature proton exchange membrane fuel cells

Zhang, Shuomeng; Zhang, Jujia; Zhu, Zejie; Liu, Pan; Cao, Fahe; Chen, Jian; He, Qinggang; Dou, Ming; Nan, Suifei; Lu, Shanfu

doi:10.1016/j.jpowsour.2020.228616

Cited by 18 publications

(13 citation statements)

References 35 publications

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“…3a. A H 3 PO 4doped poly(ethersulfone)-poly(vinyl pyrrolidone) (PES-PVP) membrane was used as the electrolyte [51,52]. In our previous study, the synthesis method and specific parameters of the membrane have been reported [53].…”

Section: Resultsmentioning

confidence: 99%

Fluorination-enabled interface of PtNi electrocatalysts for high-performance high-temperature proton exchange membrane fuel cells

Peng

Liu

et al. 2021

Sci. China Mater.

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Section: Resultsmentioning

confidence: 99%

Fluorination-enabled interface of PtNi electrocatalysts for high-performance high-temperature proton exchange membrane fuel cells

Peng

Liu

et al. 2021

Sci. China Mater.

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“…Since humidification control at higher temperatures is harder than at usual operation temperatures, the thermal properties of cell components of PEMFC should be considered in addition to the hydration of the supply gas. According to recent review papers on the research and development of gas separators [40][41][42][43], the material type, composite and surface coating process have all been investigated to improve the conductivity and H 2 O behavior control. However, the thermal properties of separators have not been investigated.…”

Section: Effect Of Separator Thickness On In-plane Temperature Distri...mentioning

confidence: 99%

Impacts of Separator Thickness on Temperature Distribution and Power Generation Characteristics of a Single PEMFC Operated at Higher Temperature of 363 and 373 K

et al. 2022

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The aim of this study is to investigate the effects of the separator thickness on not only the heat and mass transfer characteristics, but also the power generation characteristics of a polymer electrolyte membrane fuel cell (PEMFC) with a thin polymer electrolyte membrane (PEM) and thin gas diffusion layer (GDL) operated at higher temperatures of 363 and 373 K. The in-plane temperature distributions on the back of the separator at the anode and cathode, which are the opposite sides to the GDL, are measured using a thermograph at various initial cell temperatures (Tinit), relative humidity (RH) levels, and supply gas flow rates. The total voltage corresponding to the load current is measured in order to evaluate the performance of the PEMFC. As a result, it is revealed that the effect of the RH on the power generation characteristics is more significant when the separator thickness decreases. It is revealed that the power generation performance obtained at high current densities decreases with the increase in Tinit with thinner separator thicknesses. According to the investigation of the in-plane temperature distribution, it is clarified that the temperature decreases at corner positions in the separator with the separator thickness of 2.0 mm, while the temperature gradually increases along with the gas flow with separator thicknesses of 1.5 mm and 1.0 mm.

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“…Furthermore, blocking the crack connectivity to reduce PA accessibility in the catalyst layer could also mitigate PA penetration from catalyst layer (CL) to microporous layer (MPL) ( 19 ). To balance the proportion of cracks for PA penetration and gas transport, the binders have a key role to determine that the catalyst layer is H 3 PO 4 -uptake type or waterproof type ( 20 , 21 ). H 3 PO 4 -uptake binders, such as PBI polymer, accelerated PA distribution in CL but easily lead to acid flooding ( 22 , 23 ).…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2023

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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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Unusual influence of binder composition and phosphoric acid leaching on oxygen mass transport in catalyst layers of high-temperature proton exchange membrane fuel cells

Cited by 18 publications

References 35 publications

Fluorination-enabled interface of PtNi electrocatalysts for high-performance high-temperature proton exchange membrane fuel cells

Fluorination-enabled interface of PtNi electrocatalysts for high-performance high-temperature proton exchange membrane fuel cells

Impacts of Separator Thickness on Temperature Distribution and Power Generation Characteristics of a Single PEMFC Operated at Higher Temperature of 363 and 373 K

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

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