Decoupling the roles of carbon and metal oxides on the electrocatalytic reduction of oxygen on La1-xSrxCoO3-δ perovskite composite electrodes
- Univ. of Texas, Austin, TX (United States). Dept. of Chemistry; Univ. of Texas, Austin, TX (United States). Center for Nano and Molecular Science and Technology
- Skolkovo Inst. of Science and Technology, Moscow (Russia). Center for Electrochemical Energy Storage CREI
- Univ. of Texas, Austin, TX (United States). Dept. of Chemistry
- Univ. of Texas, Austin, TX (United States). Dept. of Chemistry, and Center for Nano and Molecular Science and Technology, Texas Materials Inst.; Exponent Failure Analysis Associates, Natick, MA (United States)
- Skolkovo Inst. of Science and Technology, Moscow (Russia). Center for Electrochemical Energy Storage CREI; Univ. of Antwerp, Antwerp (Belgium)
- Univ. of Strasbourg, Strasbourg (France). Inst. de Chimie de Strasbourg
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Chemical Sciences Division
- Univ. of Texas, Austin, TX (United States). Center for Nano and Molecular Science and Technology, Texas Materials Inst., and Dept. of Chemical Engineering
Perovskite oxides are active room-temperature bifunctional oxygen electrocatalysts in alkaline media, capable of performing the oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) with lower combined overpotentials relative to their precious metal counterparts. However, their semiconducting nature necessitates the use of activated carbons as conductive supports to generate applicably relevant current densities. In efforts to advance the performance and theory of oxide electrocatalysts, the chemical and physical properties of the oxide material often take precedence over contributions from the conductive additive. In this work, we find that carbon plays an important synergistic role in improving the performance of La1-xSrxCoO3-δ (0 ≤ x ≤ 1) electrocatalysts through the activation of O2 and spillover of radical oxygen intermediates, HO2- and O2-, which is further reduced through chemical decomposition of HO2- on the perovskite surface. Here, through a combination of thin-film rotating disk electrochemical characterization of the hydrogen peroxide intermediate reactions (hydrogen peroxide reduction reaction (HPRR), hydrogen peroxide oxidation reaction (HPOR)) and oxygen reduction reaction (ORR), surface chemical analysis, HR-TEM, and microkinetic modeling on La1-xSrxCoO3-δ (0 ≤ x ≤ 1)/carbon (with nitrogen and non-nitrogen doped carbons) composite electrocatalysts, we deconvolute the mechanistic aspects and contributions to reactivity of the oxide and carbon support.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Fluid Interface Reactions, Structures and Transport Center (FIRST); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC05-00OR22725; F-1529; F-1319
- OSTI ID:
- 1506782
- Alternate ID(s):
- OSTI ID: 1492463
- Journal Information:
- Physical Chemistry Chemical Physics. PCCP, Vol. 21, Issue 6; ISSN 1463-9076
- Publisher:
- Royal Society of ChemistryCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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