Influence of pore size optimization in catalyst layer on the mechanism of oxygen transport resistance in PEMFCs

Guan, Shumeng; Zhou, Fen; Tan, Jun; Pan, Mu

doi:10.1016/j.pnsc.2020.08.017

Cited by 31 publications

(16 citation statements)

References 35 publications

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“…The contribution of R M and R K is mainly dependent on the pore size. It is worth noting that R K is difficult to be directly calculated because it is hard to find an effective sensitive parameter to conduct the variable separation approach ( 45 , 46 ). Plenty of literature focused on mass transport issues for fuel cells neglected this factor (or did not separate R K ) to simplify the calculation processes ( 38 , 47 ).…”

Section: Methodsmentioning

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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Section: Methodsmentioning

confidence: 99%

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

et al. 2023

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“…The oxygen transport resistance test method and the fixture were described in our previous studies. , The oxygen transport resistance ( R tot , s·m –1 ) of the MEA was calculated by using the following equation: R tot = 4 F R T P normalO 2 I lim = 4 F ( P abs − P H 2 O ) R T X normalO 2 I lim where I lim is the limiting current density (mA·cm –2 ), P O 2 denotes the partial pressure of oxygen (kPa), P abs is the absolute gas pressure (kPa), P H 2 O is the partial pressure of water vapor (kPa), X O 2 is the mole fraction of oxygen, R is the molar gas constant (J·mol –1 ·K –1 ), T is the gas temperature (K), and F is the Faraday constant (C·mol –1 ).…”

Section: Methodsmentioning

confidence: 99%

Poly(1,5-diaminoanthraquinone)-Modified Gas Diffusion Backing by Electrochemical Deposition

Zhang

et al. 2023

Energy Fuels

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In this study, poly(1,5-diaminoanthraquinone) (P15DAAQ) was deposited on carbon fiber of gas diffusion backing (GDB) by electrochemical deposition to improve the water management ability of the gas diffusion layer (GDL). The morphology of carbon fibers of GDB was characterized by scanning electron microscopy, and the pore structure of GDBs was characterized by microcomputed tomography. The polarization curve and the limiting current method were used to study the performance and water management capabilities of proton exchange membrane fuel cells. The results show that the performance of P15DAAQ-GDB is better than that of traditional GDB modified by hydrophobic treatment with polytetrafluoroethylene (PTFE) under high relative humidity and high current density. The highest power density reaches 1.984 W·cm–2, which is 41.3% higher than that obtained under traditional PTFE hydrophobic treatment. The oxygen mass transfer resistance of P15DAAQ-GDL is smaller than that of PTFE-GDL, and the dry region (<4240 mA·cm–2) is wider than that of PTFE-GDL (<3600 mA·cm–2). These results indicate that P15DAAQ-GDL exhibits better oxygen mass transfer and water management capabilities thanPTFE-GDL.

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“…The electrode manufacturing method with the integration of proton exchange membrane (PEM), anode catalyst layer (ACL), cathode catalyst layer (CCL), and gas diffusion layers (GDL) is pivotal to realize the high activity of catalyst in MEA during fuel cell actual operation. [ 118–121 ] As shown in Figure 7 , gas diffusion electrode (GDE) method was early developed to manufacture MEA, in which catalyst slurry is coated on GDL, subsequently the GDL and proton exchange membrane bonded together through a hot pressing method, ultimately forming the membrane electrode assembly. [ 122–124 ] Unfortunately, up to now, the GDE approach still suffers from insufficient MEA performance.…”

Section: Advances In Membrane Electrode Assembly (Mea)mentioning

confidence: 99%

“…Rationally designed electrode with balanced micro‐, meso‐, and macro‐porosity is essential to construct the triple‐phase boundary and accelerate mass and charge transportation. [ 120,140,141 ] Recently, Jaouen et al. designed a 3D architecture of Fe–N–C cathodes by electrospinning technique (E‐ZIF‐8(Fe)/PAN‐Ar) ( Figure 11 ).…”

Section: Advances In Membrane Electrode Assembly (Mea)mentioning

confidence: 99%

Advanced Atomically Dispersed Metal–Nitrogen–Carbon Catalysts Toward Cathodic Oxygen Reduction in PEM Fuel Cells

Deng

Luo

Chi

et al. 2021

Advanced Energy Materials

128

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Proton exchange membrane fuel cells (PEMFCs) are a highly efficient hydrogen energy conversion technology, which shows great potential in mitigating carbon emissions and the energy crisis. Currently, to accelerate the kinetics of the oxygen reduction reaction (ORR) required for PEMFCs, extensive utilization of expensive and rare platinum‐based catalysts are required at the cathodic side, impeding their large‐scale commercialization. In response to this issue, atomically dispersed metal–nitrogen–carbon (M–N–C) catalysts with cost‐effectiveness, encouraging activity, and unique advantages (e.g., homogeneous activity sites, high atom efficiency, and intrinsic activity) have been widely investigated. Considerable progress in this domain has been witnessed in the past decade. Herein, a comprehensive summary of recent development in atomically dispersed M–N–C catalysts for the ORR under acidic conditions and of their application in the membrane electrode assembly (MEA) of PEM fuel cells, are presented. The ORR mechanisms, composition, and operating principles of PEMFCs are introduced. Thereafter, atomically dispersed M–N–C catalysts towards improved acidic ORR and MEA performance is summarized in detail, and improvement strategies for MEA performance and stability are systematically analyzed. Finally, remaining challenges and significant research directions for design and development of high‐performance atomically dispersed M–N–C catalysts and MEA are discussed.

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Influence of pore size optimization in catalyst layer on the mechanism of oxygen transport resistance in PEMFCs

Cited by 31 publications

References 35 publications

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

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

Poly(1,5-diaminoanthraquinone)-Modified Gas Diffusion Backing by Electrochemical Deposition

Advanced Atomically Dispersed Metal–Nitrogen–Carbon Catalysts Toward Cathodic Oxygen Reduction in PEM Fuel Cells

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