Cobalt phosphate nanoparticles embedded nitrogen and phosphorus-codoped graphene aerogels as effective electrocatalysts for oxygen reduction

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Abstract

Developing cost-efficient and high-performance non-noble metal electrocatalysts for oxygen reduction reaction is of great significance for large-scale commercialization of fuel cells. Here, a novel cobalt phosphate-embedded nitrogen and phosphorus co-doped graphene aerogel [labeled as Co 3 (PO 4 ) 2 /N,P-GA] is prepared via combination of a facile hydrothermal apporoach with a pyrolysis procedure. The obtained Co 3 (PO 4 ) 2 /N,P-GA catalysts display excellent catalytic performance in base media, with optimal Co 3 (PO 4 ) 2 /N,P-GA-900 (the material prepared at pyrolysis temperature of 900°C) showing better catalytic activity for ORR than other as-obtained contrast materials in terms of the onset potential, half-wave potential and diffusion-limiting current density, even superior to the commercial Pt/C catalyst. Furthermore, the Co 3 (PO 4 ) 2 /N,P-GA also possesses good methanol tolerance and excellent durability. The superior performance of Co 3 (PO 4 ) 2 /N,P-GA is attributed to the hierachical porous structure, large BET surface area, N,P-codoping, cobalt phosphate-based nanoparticles loaded on graphene nanosheets, and synergistic effects between the doped active species. Therefore, it is expected to replace Pt/C as a promising fuel cell catalyst in alkaline direct methanol fuel cells.

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Xuan, L. L., Liu, X. J., & Wang, X. (2019). Cobalt phosphate nanoparticles embedded nitrogen and phosphorus-codoped graphene aerogels as effective electrocatalysts for oxygen reduction. Frontiers in Materials, 6. https://doi.org/10.3389/fmats.2019.00022

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