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A perspective on influences of cathode material degradation on oxygen transport resistance in low Pt PEMFC

Nano Research 2023年第1期16卷 377-390页

作者： Huiyuan Li Xiaojing Cheng Xiaohui Yan Shuiyun Shen Junliang Zhang Institute of Fuel Cells School of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China MOE Key Laboratory of Power&Machinery Engineering Shanghai Jiao Tong UniversityShanghai 200240China

A large-scale industrial application of proton exchange membrane fuel cells(PEMFCs)greatly depends on both substantial cost reduction and continuous durability ***,compared to effects of material degradation on apparent activity loss,little attention has been paid to influences on the phenomena of mass *** this review,influences of the degradation of key materials in membrane electrode assemblies(MEAs)on oxygen transport resistance in both cathode catalyst layers(CCLs)and gas diffusion layers(GDLs)are comprehensively explored,including carbon support,electrocatalyst,ionomer in CCLs as well as carbon material and hydrophobic polytetrafluoroethylene(PTFE)in *** is analyzed that carbon corrosion in CCLs will result in pore structure destruction and impact ionomer distribution,thus affecting both the bulk and local oxygen transport *** the catalyst degradation,an eventual decrease in electrochemical active surface area(ECSA)definitely increases the local oxygen transport resistance since a decrease in active sites will lead to a longer oxygen transport *** is also noted that problems concerning oxygen transport caused by the degradation of ionomer chemical structure in CCLs should not be *** cation contamination and chemical decomposition will change the structure of ionomer,thus worsening the local oxygen ***,it is found that the loss of carbon and PTFE in GDLs lead to a higher hydrophilicity,which is related to an occurrence of water flooding and increase in the oxygen transport resistance.

关键词： proton exchange membrane fuel cells(PEMFC) oxygen transport resistance degradation cathode catalyst layer gas diffusion layer

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

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Progress in Natural Science:Materials International 2020年第6期30卷 839-845页

作者： Shumeng Guan Fen Zhou Jinting Tan Mu Pan State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology Hubei Provincial Key Laboratory of Fuel Cells Wuhan University of Technology

In PEMFC, the oxygen transport resistance severely hinders the cell from achieving high performance. In this paper, pore-forming agent was used to optimize the pore size distribution of the catalyst layer(CL), and to study its effect on the mechanism of oxygen transport resistance, including molecular diffusion resistance, Knudsen diffusion resistance, and local O2resistance in CL. The results showed that with the pore formation the cell performance had a significant improvement at high current density, mainly due to its better oxygen transport properties, especially under low platinum conditions. The addition of pore-forming agent moved the pore diameter toward a larger pore diameter with a range from 70 to 100 nm, and also obtaining a higher cumulative pore volume. It was found that the increase of the cumulative pore volume and larger pore size were conducive to the diffusion of oxygen molecules in CL, and the resistance caused by which was the dominant part in total transport resistance. Further tests indicated that the improvement of molecular diffusion resistance was much larger than that of Knudsen diffusion resistance in the catalyst layer after pore formed. In addition, the optimized pore structure will also get a higher number of effective pores, which resulted in an increased effective area of the ionomer on the Pt surface. The higher effective area of the ionomer was particularly beneficial for the reduction of local O2resistance with low Pt loading.

关键词： Pore size optimization Pore-forming agent oxygen transport resistance PEMFC

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Measurement and separation of cathodic mass transport resistance in high temperature proton exchange membrane fuel cell

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Progress in Natural Science:Materials International 2020年第6期30卷 868-875页

作者： Ziqian Wang Linlin Yang Suli Wang Hai Sun Gongquan Sun Key Laboratory of Fuel Cells and Hybrid Power Sources Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences

High oxygen transport resistance in the cathode is a main cause of the low performance of high temperature proton exchange membrane fuel cell(HT-PEMFC), and therefore to determine the contribution of different mass transport processes to the oxygen transport resistance is beneficial to the subsequent research work. In this paper,the molecular diffusion resistance(R) in the cathode was successfully calculated by measuring the limiting currents with using different diluent gases. And the oxygen transport resistance in phosphoric acid(R) was analyzed by changing the humidity and temperature. It was found that the total oxygen transport resistance(R) increased obviously with the increase of the humidify, and the variation of Runder different conditions was mainly related to the change of R. Combined with the phenomenon that the experimental value of Rwas less than the calculated value at high humidity, but higher than that at high operation temperature, we speculate that the cause of that Rincreased obviously at high humidity is the occupancy or blockage of gas phase transport channel in catalyst layer(CL) by phosphoric acid due to the water absorption of phosphoric acid in CL and the swelling of membrane. This consequence indicates that it is the change of phosphoric acid distribution that dominate Cthe Rhigh humidity.

关键词： Electrochemistry Fuel cells High temperature proton exchange membrane oxygen transport resistance Limiting current

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Development and Challenges of Electrode Ionomers Used in the Catalyst Layer of Proton-Exchange Membrane Fuel Cells:A Review

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Transactions of Tianjin University 2023年第5期29卷 360-386页

作者： Qingnuan Zhang Bo Wang School of Chemistry and Chemical Engineering Beijing Institute of TechnologyBeijing 100081China

The electrode ionomer plays a crucial role in the catalyst layer(CL) of a proton-exchange membrane fuel cell(PEMFC) and is closely associated with the proton conduction and gas transport properties,structural stability,and water management *** this review,we discuss the CL structural characteristics and highlight the latest advancements in ionomer material ***,we comprehensively introduce the design concepts and exceptional performances of porous electrode ionomers,elaborate on their structural properties and functions within the fuel cell CL,and investigate their effect on the CL microstructure and ***,we present a prospective evaluation of the developments in the electrode ionomer for fabricating CL,offering valuable insights for designing and synthesizing more efficient electrode ionomer *** addressing these facets,this review contributes to a comprehensive understanding of the role and potential of electrode ionomers for enhancing PEMFC performance.

关键词： Electrode ionomer Proton conduction oxygen transport resistance Catalyst layer Proton-exchange membrane fuel cell

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