Citation: Jinhui Tong, Wenyan Li, Lili Bo, Wenhui Wang, Yuliang Li, Tao Li, Qi Zhang, Haiyan Fan. Simple synthesis of nitrogen-doped carbon spheres as a highly efficient metal-free electrocatalyst for the oxygen reduction reaction[J]. Chinese Journal of Catalysis, ;2018, 39(6): 1138-1145. doi: 10.1016/S1872-2067(18)63078-5 shu

Simple synthesis of nitrogen-doped carbon spheres as a highly efficient metal-free electrocatalyst for the oxygen reduction reaction

Jinhui Tong ^a, ,
Wenyan Li ^a ,
Lili Bo ^b ,
Wenhui Wang ^a ,
Yuliang Li ^a ,
Tao Li ^a ,
Qi Zhang ^a ,
Haiyan Fan ^c

a Key Laboratory of Polymer Materials of Gansu Province, Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, China;
b College of Science, Gansu Agricultural University, Lanzhou 730070, Gansu, China;
c Department of Chemistry, School of Science and Technology, Nazarbayev University, Astana 010000, Kazakhstan

Received Date: 18 April 2018
Revised Date: 23 April 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21363021, 51302222) and Program for Changjiang Scholars and Innovative Research Team in University (IRT15R56).

In the present work, nitrogen-doped carbon spheres were synthesized through a simple hydrothermal treatment using glucose and melamine as inexpensive carbon and nitrogen sources, respectively. The ratio of melamine to glucose and annealing temperature were optimized. The final optimal sample exhibited a catalytic activity for the oxygen reduction reaction (ORR) that was superior than that of commercial 20%Pt/C in 0.1 mol/L KOH. It revealed an onset potential of -22.6 mV and a half-wave potential of -133.6 mV (vs. Ag/AgCl), which are 7.2 and 5.9 mV more positive than those of the 20%Pt/C catalyst, respectively, as well as a limiting current density of 4.6 mA/cm², which is 0.2 mA/cm² higher than that of the 20%Pt/C catalyst. The catalyst also exhibited higher stability and superior durability against methanol than 20%Pt/C. Moreover, ORRs on this catalyst proceed through a more effective 4e^- path. The above mentioned superiority of the as-prepared catalyst makes it promising for fuel cells.
- Nitrogen doping,
- Carbon spheres,
- Metal-free catalyst,
- Oxygen reduction reaction
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