Issue 1, 2018

Size effect of oxygen reduction reaction on nitrogen-doped graphene quantum dots

Abstract

N-doped graphene quantum dots (GQDs) are attracting great interest as promising Pt-free oxygen reduction reaction (ORR) catalysts. In this work, the mechanism of ORR on N-doped GQDs with three different sizes has been investigated based on density functional theory. Our results show that the size of the N-doped GQDs affects the ORR. The adsorption strength of ORR intermediates, the reaction free energy of the rate-determining step, and the overpotential increase with the increase of the size of N-doped GQDs. The N-doped GQDs with the smallest size possess the smallest overpotential, indicating the highest ORR catalytic activity. Our results will help to understand the size effect of N-doped GQDs on the catalytic activity of ORR.

Graphical abstract: Size effect of oxygen reduction reaction on nitrogen-doped graphene quantum dots

Supplementary files

Article information

Article type
Paper
Submitted
11 Sep 2017
Accepted
17 Dec 2017
First published
02 Jan 2018
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2018,8, 531-536

Size effect of oxygen reduction reaction on nitrogen-doped graphene quantum dots

P. Zhang, Q. Hu, X. Yang, X. Hou, J. Mi, L. Liu and M. Dong, RSC Adv., 2018, 8, 531 DOI: 10.1039/C7RA10104J

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