Tailoring the Pt/ionomer interface for enhancing the local oxygen transport in proton exchange membrane fuel cells

文献情報

出版日 2023-10-17

DOI 10.1039/D3TA03720G

インパクトファクター 12.732

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要旨

In order to realize the high-power operation of low-cost proton exchange membrane fuel cells, it is urgent to solve the problem of oxygen mass transfer in a low Pt loading cathode at high current density. More exactly, the high local oxygen transport resistance (Rionomer) originating from the dense ionomer film on the Pt surface results in significant voltage losses. Herein, this paper proposes an exceptionally simple and cost-effective strategy to precisely regulate a Pt/ionomer interface to decrease Rionomer only by introducing hydrophobic nano-SiO2 into a cathode catalyst layer. As a result, the cathode catalyst layer modified by nano-SiO2 with a particle size of 10 nm and a content of 10% exhibits optimal mass transfer characteristics, and a specific Pt/ionomer interface with low Rionomer is established. The microstructure characterization of the catalyst layer confirms that the majority of ionomer adheres to nano-SiO2 particles and evenly distributes around the Pt/C agglomerates. Moreover, the stronger affinity of nano-SiO2 to ionomer is verified by molecular dynamics simulation. Collectively, the ability of nano-SiO2 to capture ionomer effectively reduces the ionomer density on the Pt surface, thus establishing a highly efficient oxygen-delivering Pt/ionomer interface. This work highlights an extremely promising method for Pt/ionomer interface construction of catalyst layer with high oxygen mass-transfer characteristics.

掲載誌

Journal of Materials Chemistry A

CiteScore: 19.5

自己引用率: 4.7%

年間論文数: 2211

Journal of Materials Chemistry A, B & C cover high quality studies across all fields of materials chemistry. The journals focus on those theoretical or experimental studies that report new understanding, applications, properties and synthesis of materials. The journals have a strong history of publishing quality reports of interest to interdisciplinary communities and providing an efficient and rigorous service through peer review and publication. The journals are led by an international team of Editors-in-Chief and Associate Editors who are all active researchers in their fields. Journal of Materials Chemistry A, B & C are separated by the intended application of the material studied. Broadly, applications in energy and sustainability are of interest to Journal of Materials Chemistry A, applications in biology and medicine are of interest to Journal of Materials Chemistry B, and applications in optical, magnetic and electronic devices are of interest to Journal of Materials Chemistry C. More than one Journal of Materials Chemistry journal may be suitable for certain fields and researchers are encouraged to submit their paper to the journal that they feel best fits for their particular article. Example topic areas within the scope of Journal of Materials Chemistry A are listed below. This list is neither exhaustive nor exclusive. Artificial photosynthesis Batteries Carbon dioxide conversion Catalysis Fuel cells Gas capture/separation/storage Green/sustainable materials Hydrogen generation Hydrogen storage Photocatalysis Photovoltaics Self-cleaning materials Self-healing materials Sensors Supercapacitors Thermoelectrics Water splitting Water treatment

Tailoring the Pt/ionomer interface for enhancing the local oxygen transport in proton exchange membrane fuel cells

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掲載誌

Journal of Materials Chemistry A

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