Mitigating Pt Loss in Polymer Electrolyte Membrane Fuel Cell Cathode Catalysts Using Graphene Nanoplatelet Pickering Emulsion Processing

Kyu-Young Park; Matthew E. Sweers; Ulrich BernerErhard HirthJulia R. DowningJanan HuiJonathan MailoaChristina JohnstonSoo KimLinsey C. SeitzMark C. Hersam

首页> 外文期刊>Advanced functional materials >Mitigating Pt Loss in Polymer Electrolyte Membrane Fuel Cell Cathode Catalysts Using Graphene Nanoplatelet Pickering Emulsion Processing

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Mitigating Pt Loss in Polymer Electrolyte Membrane Fuel Cell Cathode Catalysts Using Graphene Nanoplatelet Pickering Emulsion Processing

机译：Mitigating Pt Loss in Polymer Electrolyte Membrane Fuel Cell Cathode Catalysts Using Graphene Nanoplatelet Pickering Emulsion Processing

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Carbon-supported Pt nanoparticles are the leading catalysts for the cathodeoxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cells.However, these ORR catalysts suffer from poor electrochemical durability,particularly the loss of electrochemical surface area (ECSA) due to Pt nanoparticledissolution and agglomeration. Here, Pt loss is mitigated through aPickering emulsion-processing strategy that employs graphene nanoplateletdispersions stabilized by the polymer ethyl cellulose. The resulting graphene-Pt/Vulcan carbon (Pt/C) catalysts exhibit superior durability and ECSA retentionthroughout an accelerated stress test compared with a commercial Pt/Cstandard catalyst, both in a diagnostic-rotating disc electrode setup and in amembrane electrode assembly full cell. These graphene-Pt/C catalysts alsoimprove durability at high-voltage conditions, providing further evidence oftheir exceptional electrochemical stability. Consistent with density functionaltheory calculations, postelectrochemical characterization reveals that Ptnanoparticles localize at graphene defects both on the basal plane and especiallyat the edges of the graphene nanoplatelets. Since this Pt nanoparticlelocalization suppresses Pt nanoparticle dissolution and agglomerationwithout hindering accessibility of the reactant species to the catalyst surface,the ORR performance under both idealized and practical experimental conditionsshows significantly improved durability while maintaining high electrochemicalactivity.

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来源
《Advanced functional materials》 |2022年第43期|2205216.1-2205216.9|共9页
作者
Kyu-Young Park; Matthew E. Sweers; Ulrich BernerErhard HirthJulia R. DowningJanan HuiJonathan MailoaChristina JohnstonSoo KimLinsey C. SeitzMark C. Hersam;
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作者单位

Department of Materials Science and EngineeringNorthwestern UniversityEvanston, IL 60208, USA Graduate Institute of Ferrous and Energy Materials TechnologyPohang University of Science and TechnologyPohang, Kyungbuk 37673, Republic of Korea;

Department of Materials Science and EngineeringNorthwestern UniversityEvanston, IL 60208, USA;

Robert Bosch GmbHCorporate ResearchRobert-Bosch-Campus 1, 71272 Renningen, GermanyResearch and Technology CenterRobert Bosch LLC1 Kendall Square Suite 7–101, Cambridge, MA 02139, USAResearch and Technology CenterRobert Bosch LLC384 Santa Trinita Ave, Sunnyvale, CA 94085, USADepartment of Chemical and Biological EngineeringNorthwestern UniversityEvanston, IL 60208, USADepartment of Materials Science and EngineeringNorthwestern UniversityEvanston, IL 60208, USA Department of ChemistryNorthwestern UniversityEvanston, IL 60208, USA Department of Electrical and Computer EngineeringNorthwestern UniversityEvanston, IL 60208,;

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accelerated stability tests; electrochemical surface area; membrane electrode assemblies; proton exchange membrane fuel cells; rotating disc electrodes;

Mitigating Pt Loss in Polymer Electrolyte Membrane Fuel Cell Cathode Catalysts Using Graphene Nanoplatelet Pickering Emulsion Processing

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