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Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides

Lee, Dong-Gyu and Kim, Su Hwan and Joo, Se Hun and Ji, Ho-Il and Tavassol, Hadi and Jeon, Yuju and Choi, Sihyuk and Lee, Myeong-Hee and Kim, Chanseok and Kwak, Sang Kyu and Kim, Guntae and Song, Hyun-Kon (2017) Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides. Energy and Environmental Science, 10 (2). pp. 523-527. ISSN 1754-5692. https://resolver.caltech.edu/CaltechAUTHORS:20170110-100457738

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Abstract

Nitrogen-containing electrocatalysts, such as metal–nitrogen–carbon (M–N–C) composites and nitrogen-doped carbons, are known to exhibit high activities for an oxygen reduction reaction (ORR). Moreover, even if the mechanism by which nitrogen improves the activities is not completely understood, a strong electronic interaction between nitrogen and active sites has been found in these composites. Herein, we demonstrate a case in which nitrogen improves the electroactivity, but in the absence of a strong interaction with other components. The overpotentials of the ORR and oxygen evolution reaction (OER) on perovskite oxide catalysts were significantly reduced simply by mixing the catalyst particles with polypyrrole/carbon composites (pPy/C). Any strong interactions between pPy (a nitrogen-containing compound) and active sites of the catalysts are not confirmed. A scenario based on the sequential task allocation between pPy and oxide catalysts for the ORR was proposed: (1) molecular oxygen is incorporated into pPy as a form of superoxide (pPy^+O2^−), (2) the superoxide is transferred to the active sites of perovskite catalysts, and (3) the superoxide is completely reduced along the 4e ORR process.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1039/c6ee03501aDOIArticle
http://pubs.rsc.org/en/Content/ArticleLanding/2017/EE/C6EE03501APublisherArticle
http://www.rsc.org/suppdata/c6/ee/c6ee03501a/c6ee03501a1.pdfPublisherSupplementary Information
ORCID:
AuthorORCID
Ji, Ho-Il0000-0002-6194-991X
Additional Information:© 2017 The Royal Society of Chemistry. Received 1st December 2016; Accepted 21st December 2016; First published online 21 Dec 2016. This work was supported by MOTIE (Materials & components (KEIT): 10062092; Human Resources (KETEP): 20164030201010), MOE (BK21Plus: 10Z20130011057) and MSIP (Mid: NRF-2015R1A2A1A10055886), Korea. D.-G. L. and H.-K. S thank Prof. Sossina M. Haile at Northwestern University for comments and technical supports, Prof. Young-Sam Kimfor FT-IR analysis, Prof. Hoi-Ri Moon and Mr Jae Hwa Lee for nitrogen adsorption experiment and Dr Young-Wan Ju for XPS analysis.
Funders:
Funding AgencyGrant Number
Ministry of Trade, Industry and Energy (Korea)10062092
Korean Energy Technology Evaluation and Planning20164030201010
Ministry of Education (Korea)10Z20130011057
Ministry of Science, ICT and Future Planning (Korea)NRF-2015R1A2A1A10055886
Issue or Number:2
Record Number:CaltechAUTHORS:20170110-100457738
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170110-100457738
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73365
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:10 Jan 2017 18:48
Last Modified:03 Oct 2019 16:27

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