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. 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.
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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. | ||||||||||||
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Issue or Number: | 2 | ||||||||||||
DOI: | 10.1039/c6ee03501a | ||||||||||||
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: | 11 Nov 2021 05:15 |
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