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C-O--K+(Na+) groups in non-doped carbon as active sites for oxygen reduction reaction

Abstract

Carbon-based materials exhibit high electrocatalytic activity for the oxygen reduction reaction (ORR), which is an essential step for several renewable and clean energy systems. To make them as alternatives to Pt-based catalysts for ORR, a deep understanding on the ORR active sites on the carbon surface is needed but remains a major challenge. In nitrogen (N)-doped carbons, the carbon atoms next to pyridinic N are suggested to be the active sites for ORR. Here we show the non-doped carbon materials (from carbon dots by annealing treatment at 1000℃) create the surface defects by removing the carbonate groups from the carbon surface under alkaline conditions (KOH/NaOH). Subsequently, the K+ (Na+) attached on the defects (e.g., hydroxyl group) to form the adjacent C-O--K+ (Na+) groups (C-O--K+ (Na+) pairs), which are suggested to be the real catalytic active sites for ORR, similar to those of Pt catalysts.

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Publication details

The article was received on 16 Mar 2018, accepted on 14 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8TA02445F
Citation: J. Mater. Chem. A, 2018, Accepted Manuscript
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    C-O--K+(Na+) groups in non-doped carbon as active sites for oxygen reduction reaction

    Y. Zhou, Y. Sun, C. Zhu, Y. Liu, X. Dai, J. Zhong, Q. Chen, H. Tian, R. Zhou and Z. Kang, J. Mater. Chem. A, 2018, Accepted Manuscript , DOI: 10.1039/C8TA02445F

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