Operando tracking the interactions between CoO_x and CeO₂ during oxygen evolution reaction

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{
  "revision": 5, 
  "id": "1938", 
  "created": "2023-10-16T12:47:28.835291+00:00", 
  "metadata": {
    "doi": "10.24435/materialscloud:yh-sq", 
    "status": "published", 
    "title": "Operando tracking the interactions between CoO<sub>x</sub> and CeO\u2082 during oxygen evolution reaction", 
    "mcid": "2023.157", 
    "license_addendum": null, 
    "_files": [
      {
        "description": "The files contains the raw data for the figures in the main text (including electrochemical measurement, hXAS and sXAS charaterizations).", 
        "key": "Raw data for CoOx CeO2 project.xlsx", 
        "size": 5686767, 
        "checksum": "md5:a80b1a69892473a93ba2503a555e731d"
      }
    ], 
    "owner": 1165, 
    "_oai": {
      "id": "oai:materialscloud.org:1938"
    }, 
    "keywords": [
      "Oxygen evolution reaction", 
      "Co redox", 
      "Co oxidation", 
      "Operando XAS", 
      "CeO2"
    ], 
    "conceptrecid": "1937", 
    "is_last": true, 
    "references": [
      {
        "type": "Journal reference", 
        "doi": "submitted", 
        "citation": "J Huang,* N. Hales,[a] A. H. Clark,  N. S. Y\u00fczbasi, C. N. Borca, T. Huthwelker, T. J. Schmidt and E. Fabbri*, submitted (2023)"
      }
    ], 
    "publication_date": "Oct 17, 2023, 11:16:40", 
    "license": "Creative Commons Attribution 4.0 International", 
    "id": "1938", 
    "description": "CeO\u2082 greatly enhances the electrocatalytic oxygen evolution reaction (OER) activity of CoO<sub>x</sub>, though the enhancement mechanism beyond this synergy is yet to be understood. Here, operando hard X-ray adsorption spectroscopy (hXAS) is applied to monitor the Co K edge and Ce L\u2083 edge in CoO<sub>x</sub>/CeO\u2082 to shed light on the evolution of the Co and Ce oxidation states during OER. In addition, ex situ soft XAS (sXAS) characterizations provide information on the irreversible surface-specific transformations of the Co L\u2083 edge as well as of the O K edge. Combining the operando and ex situ spectroscopic characterizations with comprehensive electrochemical analyses, we confirm CeO\u2082 is not the active center for the OER. However, coupling CeO\u2082 with CoO<sub>x</sub> introduces significant modifications in the Co and O species at the CoO<sub>x</sub> surface and alters the flat band potential (Efb), leading to more favorable Co oxidation state transformations during OER and possibly modifying the preferential reaction pathway. This work establishes the connections between electronic structures, Co oxidation state and the OER reaction mechanism for CoO<sub>x</sub>/CeO\u2082 composites electrodes.", 
    "version": 1, 
    "contributors": [
      {
        "email": "jinzhen.huang@psi.ch", 
        "affiliations": [
          "Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Huang", 
        "givennames": "Jinzhen"
      }, 
      {
        "email": "natasha.hales@psi.ch", 
        "affiliations": [
          "Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Hales", 
        "givennames": "Natasha"
      }, 
      {
        "email": "adam.clark@psi.ch", 
        "affiliations": [
          "Photon Science Division, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Clark", 
        "givennames": "Adam H."
      }, 
      {
        "email": "Sena.Yuezbasi@empa.ch", 
        "affiliations": [
          "Laboratory for High Performance Ceramics, Empa - Swiss Federal Laboratories for Materials Science and Technology, CH-8600 D\u00fcbendorf, Switzerland"
        ], 
        "familyname": "Y\u00fczbasi", 
        "givennames": "Nur Sena"
      }, 
      {
        "email": "camelia.borca@psi.ch", 
        "affiliations": [
          "Photon Science Division, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Borca", 
        "givennames": "Camelia Nicoleta"
      }, 
      {
        "email": "thomas.huthwelker@psi.ch", 
        "affiliations": [
          "Photon Science Division, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Huthwelker", 
        "givennames": "Thomas"
      }, 
      {
        "email": "thomasjustus.schmidt@psi.ch", 
        "affiliations": [
          "Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland", 
          "Institute for Physical Molecular Sciences, ETH Z\u00fcrich, CH-8093 Z\u00fcrich, Switzerland"
        ], 
        "familyname": "Schmidt", 
        "givennames": "Thomas J."
      }, 
      {
        "email": "emiliana.fabbri@psi.ch", 
        "affiliations": [
          "Electrochemistry Laboratory, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland"
        ], 
        "familyname": "Fabbri", 
        "givennames": "Emiliana"
      }
    ], 
    "edited_by": 576
  }, 
  "updated": "2023-10-17T09:16:40.302799+00:00"
}