N/S-Me (Fe, Co, Ni) doped hierarchical porous carbons for fuel cell oxygen reduction reaction with high catalytic activity and long-term stability

Mingjie Wu, Enguang Zhang, Qinping Guo, Yongzhen Wang, Jinli Qiao, Kaixi Li and Pucheng Pei

Applied Energy, 2016, vol. 175, issue C, 468-478

Abstract: A series of novel and high-performing oxygen reduction reaction (ORR) catalysts based on N/S-Me-doped (Me=Fe, Co, Ni) hierarchical porous carbons (N/S-Fe-HPC, N/S-Co-HPC and N/S-Ni-HPC) have been synthesized by a green and cost-effective method combining a simple silicate templated two-step graphitization of the impregnated carbon. After optimization of the porous structures and enlargement of the BET specific surface area by combining the silicate template and the Fe-, Co- and Ni-metal sulfates, the obtained N/S-Me-HPC catalysts exhibit excellent ORR performance in both alkaline and acidic media. In particular, N/S-Fe-HPC shows superior catalytic ORR performance compared to commercially available 20% Pt/C in alkaline medium reflected by the onset potential of 0.98V and half-wave potential of 0.86V, and comparable ORR activity in acidic media with the onset potential of 0.84V and half-wave potential of 0.73V. In addition, the N/S-Fe-HPC catalyst exhibits excellent long-term stability and a high methanol tolerance. The outstanding electrochemical performance of such catalysts thereby makes it possible for these non-noble catalysts to replace the commercial Pt/C in both fuel cell and metal–air battery applications.

Keywords: N/S-(Fe, Co, Ni)-doped hierarchical porous carbons; Oxygen reduction reaction; Fuel cells; Metal–air batteries (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (7)

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DOI: 10.1016/j.apenergy.2016.03.065

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