Effect of Graphene-Graphene Oxide Modified Anode on the Performance of Microbial Fuel Cell

The inferior hydrophilicity of graphene is an adverse factor to the performance of the graphene modified anodes (G anodes) in microbial fuel cells (MFCs). In this paper, different amounts of hydrophilic graphene oxide (GO) were doped into the modification layers to elevate the hydrophilicity of the G anodes so as to further improve their performance. Increasing the GO doped ratio from 0.15 mg·mg^-1 to 0.2 mg·mg^-1 and 0.25 mg·mg^-1, the static water contact angle (θ_c) of the G-GO anodes decreased from 74.2 ± 0.52° to 64.6 ± 2.75° and 41.7 ± 3.69°, respectively. The G-GO_0.2 anode with GO doped ratio of 0.2 mg·mg^-1 exhibited the optimal performance and the maximum power density (P_max) of the corresponding MFC was 1100.18 mW·m^-2, 1.51 times higher than that of the MFC with the G anode.