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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. doi:10.1039/c6ee03501a.

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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
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URLURL TypeDescription Information
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.
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
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:73365
Deposited By: Tony Diaz
Deposited On:10 Jan 2017 18:48
Last Modified:11 Nov 2021 05:15

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