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Achievement of a novel porous non-noble-metal catalyst with excellent oxygen reduction reaction activity: Promoting the commercialization of alkaline fuel cells

Bing-Ye Song,Ming-Jia Li,Yi-Wen Yang,Ya-Ling He

One of the urgent problems in the commercialization of fuel cells is the high cost of electrode materials due to the use of Pt/C as the catalyst for oxygen reduction reaction (ORR). Herein, by taking advantages of the metal-organic frameworks, a novel ORR catalyst of Co@Co 9 S 8 –N/C with composite porous structure is synthesized with a facile coprecipitation-pyrolysis method. Co@Co 9 S 8 –N/C is composed of graphitic carbon skeleton with Co 9 S 8 covered Co nanoparticles (Co@Co 9 S 8 ) and nitrogen atoms doping on, on which Co@Co 9 S 8 and pyridinic N provide catalytic sites for ORR. The N, S doped surrounding graphitic carbon skeleton after pyrolysis and vulcanization processes can protect the electrochemical active sites from deactivation. The fabricated Co@Co 9 S 8 –N/C with abundant catalytic active sites performs excellent ORR activity and stability. Thereafter, the structure of the Co@Co 9 S 8 –N/C is optimized by changing the Zn/Co ratio in the precursor to improve its ORR performance. The results show that with the Zn/Co ratio of 3:2, Co@Co 9 S 8 –N/C gives the best ORR activity relying on its well specific surface area, sufficient and uniform-dispersed catalytic sites. Based on this, the Co@Co 9 S 8 –N/C catalytic alkaline direct glucose fuel cells perform better than the Pt/C catalytic one.