Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions

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{
  "metadata": {
    "edited_by": 952, 
    "owner": 952, 
    "_oai": {
      "id": "oai:materialscloud.org:2225"
    }, 
    "description": "The development of unified regenerative fuel cells (URFC) necessitates an active and stable bifunctional oxygen electrocatalyst. The unique challenge of possessing high activity for both the oxygen reduction (ORR) and oxygen evolution (OER) reactions, while maintaining stability over a wide potential window impedes the design of bifunctional oxygen electrocatalysts. Herein, two design strategies are explored to optimize their performance. The first incorporates active sites for ORR and OER, Mn and Co, into a single perovskite structure, which is achieved with the perovskites Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Mn<sub>0.2</sub>O<sub>3-\u03b4</sub> (BSCM) and La<sub>0.5</sub>Ba<sub>0.25</sub>Sr<sub>0.25</sub>Co<sub>0.5</sub>Mn<sub>0.5</sub>O<sub>3-\u03b4</sub> (LBSCM). The second combines an active ORR perovskite catalyst (La<sub>0.4</sub>Sr<sub>0.6</sub>MnO<sub>3-\u03b4</sub> (LSM)) with an OER active perovskite catalyst (Ba<sub>0.5</sub>Sr<sub>0.5</sub>Co<sub>0.8</sub>Fe<sub>0.2</sub>O<sub>3-\u03b4</sub> (BSCF)) in a physical mixed composite (BSCF/LSM). The success of the two strategies is investigated by measuring the catalysts\u2019 catalytic performance and response to alternating reducing and oxidizing potentials to mimic the dynamic conditions experienced during operation of URFCs. Additionally, the continuous, potentiodynamic change in Mn, Co, and Fe oxidation state during ORR and OER is elucidated with operando X-ray absorption spectroscopy (XAS) measurements, revealing key insights into the nature of the active sites. The results reveal important catalyst physiochemical properties and provide a guide for future research and design principles for bifunctional oxygen electrocatalysts.", 
    "mcid": "2024.93", 
    "id": "2225", 
    "license": "Creative Commons Attribution 4.0 International", 
    "license_addendum": null, 
    "references": [
      {
        "citation": "C. E. Beall, E. Fabbri, A. H. Clark, V. Meier, N. S. Y\u00fczbasi, T. Graule, S. Takahashi, Y. Shirase, M. Uchida, T. J. Schmidt, EES Catalysis (2024)", 
        "type": "Journal reference", 
        "url": "https://doi.org/10.1039/D4EY00084F", 
        "doi": "10.1039/D4EY00084F"
      }
    ], 
    "doi": "10.24435/materialscloud:q7-74", 
    "keywords": [
      "ORR", 
      "OER", 
      "perovskite"
    ], 
    "contributors": [
      {
        "affiliations": [
          "Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Beall", 
        "givennames": "Casey E."
      }, 
      {
        "affiliations": [
          "Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Fabbri", 
        "email": "emiliana.fabbri@psi.ch", 
        "givennames": "Emiliana"
      }, 
      {
        "affiliations": [
          "Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Clark", 
        "givennames": "Adam H."
      }, 
      {
        "affiliations": [
          "Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland", 
          "Institute for Physical Molecular Science, ETH Z\u00fcrich, 8093 Z\u00fcrich, Switzerland"
        ], 
        "familyname": "Meier", 
        "givennames": "Vivian"
      }, 
      {
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "familyname": "Y\u00fczbasi", 
        "givennames": "Nur Sena"
      }, 
      {
        "affiliations": [
          "Empa, Swiss Federal Laboratories for Materials Science and Technology, 8600 D\u00fcbendorf, Switzerland"
        ], 
        "familyname": "Graule", 
        "givennames": "Thomas"
      }, 
      {
        "affiliations": [
          "Hydrogen and Fuel Cell Nanomaterials Center, University of Yamanashi, 400-0021, Kofu, Japan"
        ], 
        "familyname": "Takahashi", 
        "givennames": "Sayaka"
      }, 
      {
        "affiliations": [
          "Hydrogen and Fuel Cell Nanomaterials Center, University of Yamanashi, 400-0021, Kofu, Japan"
        ], 
        "familyname": "Shirase", 
        "givennames": "Yuto"
      }, 
      {
        "affiliations": [
          "Hydrogen and Fuel Cell Nanomaterials Center, University of Yamanashi, 400-0021, Kofu, Japan"
        ], 
        "familyname": "Uchida", 
        "givennames": "Makoto"
      }, 
      {
        "affiliations": [
          "Paul Scherrer Institute (PSI), 5232 Villigen PSI, Switzerland", 
          "Institute for Physical Molecular Science, ETH Z\u00fcrich, 8093 Z\u00fcrich, Switzerland"
        ], 
        "familyname": "Schmidt", 
        "givennames": "Thomas J."
      }
    ], 
    "conceptrecid": "2224", 
    "version": 1, 
    "publication_date": "Jun 21, 2024, 12:44:12", 
    "is_last": true, 
    "status": "published", 
    "_files": [
      {
        "size": 415, 
        "checksum": "md5:684c4a1af3f7ad0160fa8ccafd387387", 
        "description": "READ ME", 
        "key": "READ ME.txt"
      }, 
      {
        "size": 7940143, 
        "checksum": "md5:1ab3e34807fc1af7e8da267bbd223067", 
        "description": "Raw data from the figures in the main text of the journal article. Data includes electrochemical data (RDE and single cell AEMWE and AEMFC tests) and operando XAS data.", 
        "key": "Bifunctional Design Paper Archive.zip"
      }
    ], 
    "title": "Designing bifunctional perovskite catalysts for the oxygen reduction and evolution reactions"
  }, 
  "id": "2225", 
  "updated": "2024-06-28T13:48:35.978500+00:00", 
  "created": "2024-06-19T16:37:40.263323+00:00", 
  "revision": 11
}