Enhanced bioelectrochemical performance of microbial fuel cell with titanium dioxide-attached dual metal organic frameworks grown on zinc aluminum - layered double hydroxide as cathode catalyst.

[Display omitted] • TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH was successfully prepared by distributed feeding method. • TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH was stable, conductivity and multiple reaction sites. • Maximum power density of TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH-MFC was 409.6 mW/m2. • The combined action of LDH, dual MOFs and TiO 2 enhanced the MFC performance. In this study, a three-step distributed feeding method was used to prepare TiO 2 -attached dual CoZn-metal organic frameworks growing on ZnAl-layered double hydroxide (TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH) as cathode catalyst of microbial fuel cell (MFC). The composite material was a composite core–shell structure constructed by multi-layer coating with sheet-like ZnAl-LDH as the base, dual MOFs as the magnetic core and TiO 2 as the rough surface. The composite material had crystal planes (0 0 9), (1 1 0), (1 0 1) interface. The rough surface, core–shell core and polyhedral structure of TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH were observed. The complete distribution of Ti, Zn, Al, and Co in the material was observed and offered active sites. The contents of Ti (15.97 %), Al (5.53 %), Na (5.04 %), N (3.52%), Zn (1.47 %) were found out. TiO 2 @ZIF-67/ZIF-8@ZnAl-LDH was excellent in electrochemical activity and the maximum power density was 409.6 mW/m2, the stable continuous output voltage was 538.4 mV for 8 d. [ABSTRACT FROM AUTHOR]