气候变化领域集成服务门户(CCPortal): Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides

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DOI	10.1039/c6ee03501a
	Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides
	Lee D.-G.; Kim S.H.; Joo S.H.; Ji H.-I.; Tavassol H.; Jeon Y.; Choi S.; Lee M.-H.; Kim C.; Kwak S.K.; Kim G.; Song H.-K.
发表日期	2017
ISSN	17545692
起始页码	523
结束页码	527
卷号	10 期号:2
英文摘要	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. © The Royal Society of Chemistry 2017.
英文关键词	Carbon; Catalyst activity; Catalysts; Doping (additives); Electrocatalysis; Electrocatalysts; Electrolytic reduction; Nitrogen; Oxygen; Perovskite; Polypyrroles; Electronic interactions; Nitrogen-doped carbons; Oxygen electrocatalysis; Oxygen evolution reaction; Oxygen reduction reaction; Perovskite catalysts; Perovskite oxide catalysts; Polypyrrole/carbon composites; Molecular oxygen; catalysis; catalyst; chemical bonding; composite; electrokinesis; oxide; oxygen; perovskite; polymer
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190539
作者单位	School of Energy and Chemical Engineering, UNIST, Ulsan, 44919, South Korea; Department of Applied Physics and Materials Science, California Institute of Technology, Pasadena, CA 91125, United States; Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, United States
推荐引用方式 GB/T 7714	Lee D.-G.,Kim S.H.,Joo S.H.,et al. Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides[J],2017,10(2).
APA	Lee D.-G..,Kim S.H..,Joo S.H..,Ji H.-I..,Tavassol H..,...&Song H.-K..(2017).Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides.Energy & Environmental Science,10(2).
MLA	Lee D.-G.,et al."Polypyrrole-assisted oxygen electrocatalysis on perovskite oxides".Energy & Environmental Science 10.2(2017).