Phosphonate-derived nitrogen-doped cobalt phosphate/carbon nanotube hybrids as highly active oxygen reduction reaction electrocatalysts

doi:10.1016/S1872-2067(19)63455-8

Abstract

Abstract: The exploration of cost-effective non-noble-metal electrocatalysts is highly imperative to replace the state-of-the-art platinum-based catalysts for oxygen reduction reaction (ORR). Here, we prepared cobalt phosphonate-derived N-doped cobalt phosphate/carbon nanotube hybrids (CoPiC-N/CNTs) by hydrothermal treatment of N-containing cobalt phosphonate and oxidized carbon nanotubes (o-CNT) followed by high-temperature calcination under nitrogen atmosphere. The resultant CoPiC-N/CNT exhibits a superior electrocatalytic performance for the ORR in alkaline media, which is equal to the commercial Pt/C catalyst in the aspect of half-wave potential, onset potential and diffuse limiting current density. Furthermore, the excellent tolerance to methanol and strong durability outperform those of commercial Pt/C. It is found that cobalt phosphonate-derived N-doped cobalt phosphate and the in-situ formed graphitic carbons play key roles on the activity enhancement. Besides, introducing a suitable amount of CNTs enhances the electronic conductivity and further contributes to the improved ORR performance.

Key words: Metal phosphonate, Metal phosphate, Carbon nanotubes, Oxygen reduction reaction, Electrocatalysis

Hui Zhao, Chen-Chen Weng, Jin-Tao Ren, Li Ge, Yu-Ping Liu, Zhong-Yong Yuan. Phosphonate-derived nitrogen-doped cobalt phosphate/carbon nanotube hybrids as highly active oxygen reduction reaction electrocatalysts[J]. Chinese Journal of Catalysis, 2020, 41(2): 259-267.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(19)63455-8

https://www.cjcatal.com/EN/Y2020/V41/I2/259

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