Cobalt/nitrogen doped porous carbon as catalysts for efficient oxygen reduction reaction: towards hybrid enzymatic biofuel cells

Xiaogeng Feng, Xinxin Xiao, Jingdong Zhang, Liping Guo, Ying Xiong*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Electrochemical oxygen reduction reaction (ORR) represents a crucial cathodic process of different fuel cells. The development of highly active and stable noble metal-free ORR electrocatalysts remains as one of major challenges. Herein, we report cobalt/nitrogen co-doped porous carbon materials (Co-N-C) from well-designed bimetal-organic frameworks (ZnxCo100-x-ZIF) as efficient ORR electrocatalysts in both pH-neutral and alkaline solutions. The compositional and structural features, and the corresponding ORR activity can be tailored by tuning the Zn/Co ratio in the precursor. Remarkable features of large surface-area and suitable graphitization degree and well-dispersed Co-N-C moieties, enable a high catalytic efficiency. The optimized electrocatalyst registers considerable ORR performance with a high half-wave potential of 0.65 V vs RHE and a saturated current density of 5.30 mA cm−2 close to the value of the commercial Pt/C in 0.1 M pH 7.0 PBS, and considerable operational stability and tolerance to glucose. A preliminary one-compartment hybrid glucose/O2 enzymatic biofuel cell, consisting of Co-N-C-10 abiotic cathode and glucose oxidising bioanode, is constructed and tested. Furthermore, Co-N-C also presents reasonable ORR electrocatalytic activity and operational stability in alkaline condition.
Original languageEnglish
Article number138791
JournalElectrochimica Acta
ISSN0013-4686
DOIs
Publication statusAccepted/In press - 2021

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