Enhanced bioelectrochemical performance of CoS2/TiO2 attaching Fe-based metal organic frameworks grown on NiFe-layered double hydroxide as cathode catalyst in microbial fuel cell.

In this study, Fe-based metal organic frameworks (MIL-100(Fe)) loaded with CoS 2 /TiO 2 on layered double hydroxide (LDH) was successfully prepared by hydrothermal and solution casting methods, which was utilized as novel catalyst for bioelectricity generation and cathodic oxygen reduction reaction (ORR) in microbial fuel cell (MFC). Electrochemical tests showed good oxygen reduction activity. The maximum power density of CoS 2 /TiO 2 /MIL-100(Fe)@NiFe-LDH-MFC was 75.272 mW/m2, which was 1.17 times higher than that of CoS 2 /TiO 2 @NiFe-LDH-MFC (64.082 mW/m2) and 1.2 times higher than that of CoS 2 /TiO 2 @MIL-100(Fe)-MFC (62.658 mW/m2), 2.03 times that of CoS 2 /TiO 2 -MFC (36.992 mW/m2), and 3 times that of TiO 2 -MFC (25.088 mW/m2). CoS 2 /TiO 2 /MIL-100(Fe)@NiFe-LDH-MFC possessed a maximum output voltage of 194 mV and a stabilization time of 220 h CoS 2 /TiO 2 /MIL-100(Fe)@NiFe-LDH possessed potential applications as a kind of potential cathode catalyst to further improve the electrochemical performance of fuel cells. [Display omitted] • CoS 2 /TiO 2 /MIL-100(Fe)@NiFe-LDH was prepared by simple hydrothermal method. • Maximum power density of CoS 2 /TiO 2 /MIL-100(Fe)@NiFe-LDH-MFC was 75.272 mW/m2. • Modification of TiO 2 with CoS2 improved conductivity and MIL-100(Fe) enhanced stability. [ABSTRACT FROM AUTHOR]