Preparation of nitrogen-doped graphene by high-gravity technology and its application in oxygen reduction--颗粒学报PARTICUOLOGY

Tian, J., Gao, F., Yu, X., Wu, W., & Meng, H. (2017). Preparation of nitrogen-doped graphene by high-gravity technology and its application in oxygen reduction. Particuology, 34, 110-117. https://doi.org/10.1016/j.partic.2017.03.002

Preparation of nitrogen-doped graphene by high-gravity technology and its application in oxygen reduction

Jie Tian ^a, Fei Gao ^a, Xiangqian Yu ^a, Wei Wu ^a *, Hong Meng ^b *

a State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
b College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China

10.1016/j.partic.2017.03.002

Volume 34, October 2017, Pages 110-117

Received 15 December 2016, Revised 8 March 2017, Accepted 12 March 2017, Available online 20 June 2017, Version of Record 12 August 2017.

E-mail: wuwei@mail.buct.edu.cn; menghong@mail.buct.edu.cn

Highlights

• High gravity and hydrothermal technologies were used to prepare nitrogen-doped graphene.

• Graphene oxide reduction and nitrogen doping were accomplished with hydrothermal method.

• The nitrogen-doped graphene had better ORR catalytic properties.

• The mechanisms of nitrogen doping and graphene oxide reduction were proposed.

Abstract

Electrochemical oxygen reduction is key to many clean and sustainable energy technologies, including proton exchange membrane fuel cells and metal–air batteries. However, the high activation barriers in the oxygen reduction reaction often make it the bottleneck of energy conversion processes; thus, high-performance oxygen reduction electrocatalysts are desired. At present, the best commercially available oxygen reduction catalyst is based on the precious metal Pt. However, it suffers from resource scarcity and unsatisfactory operational stability, hindering its widespread and large-scale application in clean and sustainable technologies. Nitrogen-doped graphene has excellent electrocatalytic properties for oxygen reduction. In this paper, a scalable method to prepare nitrogen-doped graphene with high quality was introduced, in which the graphene oxide prepared by high-gravity technology and urea was reacted under hydrothermal conditions. Accompanying the hydrothermal reaction, graphene oxide reduction and nitrogen doping were accomplished at the same time. The effect of the content of nitrogen on the performance of nitrogen-doped graphene was investigated. When the mass ratio (graphene oxide/urea) was 1:400, the nitrogen-doped graphene had the best oxygen reduction performance. Compared with the undoped samples, the initial reduction voltage of the nitrogen-doped samples distinctly shifted 45 mV to the right. When the voltage was −1.0 V, the electron transfer number was 4.1, indicating good oxygen reduction activity. The preparation method is feasible, simple, and can be easily scaled up.

Graphical abstract

Keywords

High-gravity technology; Graphene; Nitrogen-doped graphene; Oxygen reduction reaction

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