1. Novel fluorinated MIL-88B assisted hydrogen-bonded organic framework derived high efficiency oxygen reduction catalyst in microbial fuel cell.
- Author
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Chen, Leyi, Huang, Linzhe, Shi, Huihui, Wu, Tao, Huang, Lei, Yan, Jia, Liu, Xianjie, and Zhang, Hongguo
- Subjects
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MICROBIAL fuel cells , *FERRIC oxide , *OXYGEN reduction , *CATALYSTS , *CATALYTIC activity , *MASS transfer - Abstract
The crux to promote the utilization of air-cathode microbial fuel cell (AC-MFC) is to find high-efficiency and low-budget oxygen reduction reaction (ORR) catalysts, which can replace Pt-based catalysts, reduce electrode cost and thus improve the cost-effectiveness of AC-MFC. In this work, a three-dimensional network carbon structure F-MIL-HOF loaded with Fe 2 O 3 material composites have been successfully synthesized by carbonizing by NH 4 F-fluorinated MIL-88B combined with a high nitrogen content hydrogen-bonded organic framework (HOF) to evince excellent catalytic property for ORR in both alkaline and neutral electrolytes. The Fe 2 O 3 obtained after carbonization of MIL-88B portrays efficient ORR catalytic activity, and the combination with the natural pore-rich HOF precisely solves the problems of uncontrolled growth and agglomeration during Fe 2 O 3 synthesis, achieving the high dispersion and full exposure of Fe 2 O 3 nanoparticles as active sites. As-synthesized F-MIL-HOF as cathodic catalyst reaches a limiting current density of 6.40 mA cm−2 in alkaline condition, which exhibits an advantage performance over commercial Pt/C (6.26 mA cm−2). Furthermore, F-MIL-HOF shows approximately four-electron pathway with better methanol resistance and stability than Pt/C, and the performance only decreases by 10.2 % in the stability test, which still had efficient ORR catalytic performance. F-MIL-HOF is an emerging alternative electro-catalyst for AC-MFC. • F-MIL-HOF is an F-modified Fe–N–C material. • MIL-88B pyrolysis produces Fe 2 O 3 active sites to promote mass transfer. • F modification increases the stability and corrosion resistance of F-MIL-HOF. • The synergistic effect of F and N element can reduce the activation barrier. • F-MIL-HOF has outstanding ORR performance in MFC compared with Pt/C. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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