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Bioelectrochemistry. 2019 Sep 4;131:107370. doi: 10.1016/j.bioelechem.2019.107370. [Epub ahead of print]

A pyridine-Fe gel with an ultralow-loading Pt derivative as ORR catalyst in microbial fuel cells with long-term stability and high output voltage.

Author information

1
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China; University of Chinese Academy of Sciences, Beijing 100049, China.
2
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China. Electronic address: weill@iccas.ac.cn.
3
Beijing Center for Physical and Chemical Analysis, Beijing 100089, China.
4
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun North First Street 2, Beijing 100190, China. Electronic address: jqshen@iccas.ac.cn.

Abstract

A low-cost and high-efficiency oxygen reduction reaction (ORR) catalyst was fabricated using a pyridine-Fe gel with ultralow-loading of Pt nanoparticles and subsequently applied to air-cathode microbial fuel cells (MFCs). This novel catalyst (N3/Fe/C-Pt) exhibited excellent electrocatalytic activity with a positive onset potential of 0.19 V (vs Ag/AgCl) and half-wave potential of 0.03 V (vs Ag/AgCl), which is comparable to commercial PtC catalysts. More importantly, N3/Fe/C-Pt shows remarkable oxygen reduction activity in MFCs with a distinct output voltage (568 mV) and power density (504 mW m-2) for 400 h when it is fed with a culture medium containing 5 g L-1 sucrose in the phosphate buffer solution. This strategy, incorporating Pt nanoparticles uniformly into a conductive gel demonstrates significance for broadening the development and research of gel-based catalysts for applications in batteries.

KEYWORDS:

Microbial fuel cells; Oxygen reduction reaction; Pyridine-Fe gel; Ultralow-loading Pt

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