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Conductivity‐Dependent Completion of Oxygen Reduction on Oxide Catalysts

The electric conductivity‐dependence of the number of electrons transferred during the oxygen reduction reaction is presented. Intensive properties, such as the number of electrons transferred, are difficult to be considered conductivity‐dependent. Four different perovskite oxide catalysts of differ... Full description

Journal Title: Angewandte Chemie 21 December 2015, Vol.127(52), pp.15956-15959
Main Author: Lee, Dong‐Gyu
Other Authors: Gwon, Ohhun , Park, Han‐Saem , Kim, Su Hwan , Yang, Juchan , Kwak, Sang Kyu , Kim, Guntae , Song, Hyun‐Kon
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0044-8249 ; E-ISSN: 1521-3757 ; DOI: 10.1002/ange.201508129
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recordid: wj10.1002/ange.201508129
title: Conductivity‐Dependent Completion of Oxygen Reduction on Oxide Catalysts
format: Article
creator:
  • Lee, Dong‐Gyu
  • Gwon, Ohhun
  • Park, Han‐Saem
  • Kim, Su Hwan
  • Yang, Juchan
  • Kwak, Sang Kyu
  • Kim, Guntae
  • Song, Hyun‐Kon
subjects:
  • Elektrische Leitfähigkeit
  • Elektrokatalyse
  • Elektronentransfer
  • Sauerstoffreduktion
  • Perowskit‐Oxide
ispartof: Angewandte Chemie, 21 December 2015, Vol.127(52), pp.15956-15959
description: The electric conductivity‐dependence of the number of electrons transferred during the oxygen reduction reaction is presented. Intensive properties, such as the number of electrons transferred, are difficult to be considered conductivity‐dependent. Four different perovskite oxide catalysts of different conductivities were investigated with varying carbon contents. More conductive environments surrounding active sites, achieved by more conductive catalysts (providing internal electric pathways) or higher carbon content (providing external electric pathways), resulted in higher number of electrons transferred toward more complete 4e reduction of oxygen, and also changed the rate‐determining steps from two‐step 2e process to a single‐step 1e process. Experimental evidence of the conductivity dependency was described by a microscopic ohmic polarization model based on effective potential localized nearby the active sites. für aktive Zentren, wie sie Perowskit‐Katalysatoren mit verbesserter Leitfähigkeit (BSCFO, NBSCO) oder ein höherer Kohlenstoffgehalt bieten, führt dazu, dass bei der vollständigen Vier‐Elektronen‐Reduktion von Sauerstoff anstelle eines zweistufigen Zwei‐Elektronen‐Prozesses ein einstufiger Ein‐Elektron‐Prozess geschwindigkeitsbestimmend wird.
language: eng
source:
identifier: ISSN: 0044-8249 ; E-ISSN: 1521-3757 ; DOI: 10.1002/ange.201508129
fulltext: fulltext
issn:
  • 0044-8249
  • 00448249
  • 1521-3757
  • 15213757
url: Link


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titleConductivity‐Dependent Completion of Oxygen Reduction on Oxide Catalysts
creatorLee, Dong‐Gyu ; Gwon, Ohhun ; Park, Han‐Saem ; Kim, Su Hwan ; Yang, Juchan ; Kwak, Sang Kyu ; Kim, Guntae ; Song, Hyun‐Kon
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subjectElektrische Leitfähigkeit ; Elektrokatalyse ; Elektronentransfer ; Sauerstoffreduktion ; Perowskit‐Oxide
descriptionThe electric conductivity‐dependence of the number of electrons transferred during the oxygen reduction reaction is presented. Intensive properties, such as the number of electrons transferred, are difficult to be considered conductivity‐dependent. Four different perovskite oxide catalysts of different conductivities were investigated with varying carbon contents. More conductive environments surrounding active sites, achieved by more conductive catalysts (providing internal electric pathways) or higher carbon content (providing external electric pathways), resulted in higher number of electrons transferred toward more complete 4e reduction of oxygen, and also changed the rate‐determining steps from two‐step 2e process to a single‐step 1e process. Experimental evidence of the conductivity dependency was described by a microscopic ohmic polarization model based on effective potential localized nearby the active sites. für aktive Zentren, wie sie Perowskit‐Katalysatoren mit verbesserter Leitfähigkeit (BSCFO, NBSCO) oder ein höherer Kohlenstoffgehalt bieten, führt dazu, dass bei der vollständigen Vier‐Elektronen‐Reduktion von Sauerstoff anstelle eines zweistufigen Zwei‐Elektronen‐Prozesses ein einstufiger Ein‐Elektron‐Prozess geschwindigkeitsbestimmend wird.
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titleConductivity‐Dependent Completion of Oxygen Reduction on Oxide Catalysts
descriptionThe electric conductivity‐dependence of the number of electrons transferred during the oxygen reduction reaction is presented. Intensive properties, such as the number of electrons transferred, are difficult to be considered conductivity‐dependent. Four different perovskite oxide catalysts of different conductivities were investigated with varying carbon contents. More conductive environments surrounding active sites, achieved by more conductive catalysts (providing internal electric pathways) or higher carbon content (providing external electric pathways), resulted in higher number of electrons transferred toward more complete 4e reduction of oxygen, and also changed the rate‐determining steps from two‐step 2e process to a single‐step 1e process. Experimental evidence of the conductivity dependency was described by a microscopic ohmic polarization model based on effective potential localized nearby the active sites. für aktive Zentren, wie sie Perowskit‐Katalysatoren mit verbesserter Leitfähigkeit (BSCFO, NBSCO) oder ein höherer Kohlenstoffgehalt bieten, führt dazu, dass bei der vollständigen Vier‐Elektronen‐Reduktion von Sauerstoff anstelle eines zweistufigen Zwei‐Elektronen‐Prozesses ein einstufiger Ein‐Elektron‐Prozess geschwindigkeitsbestimmend wird.
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abstractThe electric conductivity‐dependence of the number of electrons transferred during the oxygen reduction reaction is presented. Intensive properties, such as the number of electrons transferred, are difficult to be considered conductivity‐dependent. Four different perovskite oxide catalysts of different conductivities were investigated with varying carbon contents. More conductive environments surrounding active sites, achieved by more conductive catalysts (providing internal electric pathways) or higher carbon content (providing external electric pathways), resulted in higher number of electrons transferred toward more complete 4e reduction of oxygen, and also changed the rate‐determining steps from two‐step 2e process to a single‐step 1e process. Experimental evidence of the conductivity dependency was described by a microscopic ohmic polarization model based on effective potential localized nearby the active sites. für aktive Zentren, wie sie Perowskit‐Katalysatoren mit verbesserter Leitfähigkeit (BSCFO, NBSCO) oder ein höherer Kohlenstoffgehalt bieten, führt dazu, dass bei der vollständigen Vier‐Elektronen‐Reduktion von Sauerstoff anstelle eines zweistufigen Zwei‐Elektronen‐Prozesses ein einstufiger Ein‐Elektron‐Prozess geschwindigkeitsbestimmend wird.
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pubWILEY‐VCH Verlag
doi10.1002/ange.201508129
pages15956-15959
date2015-12-21