Details

Autor(en) / Beteiligte

• Chen, Leyi
• Huang, Linzhe
• Shi, Huihui
• Wu, Tao
• Huang, Lei
• Yan, Jia
• Liu, Xianjie
• Zhang, Hongguo

Titel

Novel fluorinated MIL-88B assisted hydrogen-bonded organic framework derived high efficiency oxygen reduction catalyst in microbial fuel cell

Ist Teil von

• Journal of power sources, 2024-09, Vol.614, Article 234939

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 Fe2O3 material composites have been successfully synthesized by carbonizing by NH4F-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 Fe2O3 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 Fe2O3 synthesis, achieving the high dispersion and full exposure of Fe2O3 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 Fe2O3 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.