Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (7): 1210-1218.DOI: 10.1016/S1872-2067(18)63089-X

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Self-assembled three-dimensional carbon networks with accessorial Lewis base sites and variational electron characteristics as efficient oxygen reduction reaction catalysts for alkaline metal-air batteries

Qiyu Wang, Zhian Zhang, Mengran Wang, Jie Li, Jing Fang, Yanqing Lai   

  1. School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China
  • Received:2018-02-25 Revised:2018-04-15 Online:2018-07-18 Published:2018-06-07
  • Contact: 10.1016/S1872-2067(18)63089-X
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (51674297), the Natural Science Foundation of Hunan Province (2016JJ2137), and the Fundamental Research Funds for the Central Universities of Central South University (2015cx001).

Abstract:

Heteroatom-doped carbon has been demonstrated to be one of the most promising non-noble metal catalysts with high catalytic activity and stability through the modification of the electronic and geometric structures. In this study, we develop a novel solvent method to prepare interconnected N, S co-doped three-dimensional (3D) carbon networks with tunable nanopores derived from an asso-ciated complex based on melamine and sodium dodecylbenzene sulfonate (SDBS). After the intro-duction of silica templates and calcination, the catalyst exhibits 3D networks with interconnected 50-nm pores and partial graphitization. With the increase of the number of Lewis base sites caused by the N doping and change of the carbon charge and spin densities caused by the S doping, the designed N, S co-doped catalyst exhibits a similar electrochemical activity to that of the commercial 20-wt% Pt/C as an oxygen reduction reaction catalyst. In addition, in an aluminum-air battery, the proposed catalyst even outperforms the commercial 5-wt% Pt/C catalyst. Both interconnected porous structures and synergistic effects of N and S contribute to the superior catalytic perfor-mance. This study paves the way for the synthesis of various other N-doped and co-doped carbon materials as efficient catalysts in electrochemical energy applications.

Key words: Carbon networks, N, S co-doped, Lewis base sites, Charge and spin densities, Oxygen reduction reaction, Alkaline metal-air batteries