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Title
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Role of the carbon support on the oxygen reduction and evolution activities in composite electrodes in alkaline solution
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Author
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Abstract
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| Metal-air batteries and fuel cells show a great deal of promise in advancing low-cost, high-energy-density charge storage solutions for sustainable energy applications. To improve the activities and stabilities of electrocatalysts for the critical oxygen reduction and evolution reactions (ORR and OER, respectively), a greater understanding is needed of the catalyst/carbon interactions and carbon stability. Herein, we report how LaNiO3 (LNO) supported on nitrogen-doped carbon nanotubes (N-CNT) made from a high-yield synthesis lowers the overpotential for both the OER and ORR markedly to enable a low bifunctional window of 0.81 V at only a 51 mu g cm(-2) mass loading. Furthermore, the addition of LNO to the N-CNTs improves the galvanostatic stability for the OER by almost 2 orders of magnitude. The nanoscale geometries of the perovskites and the CNTs enhance the number of metal-support and charge transfer interactions and thus the activity. We use rotating ring disk electrodes (RRDEs) combined with Tafel slope analysis and ICP-OES to quantitatively separate current contributions from the OER, carbon oxidation, and even anodic iron leaching from carbon nanotubes. |
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Language
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English
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Source (journal)
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ACS applied energy materials. - Washington, DC, 2018, currens
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Publication
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Washington, DC
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American Chemical Society
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2018
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ISSN
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2574-0962
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DOI
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10.1021/ACSAEM.7B00339
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Volume/pages
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1
:4
(2018)
, p. 1549-1558
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ISI
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000458705400020
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Full text (Publisher's DOI)
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Full text (open access)
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