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

Abstract

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 (θc) of the G-GO anodes decreased from 74.2 ± 0.52° to 64.6 ± 2.75° and 41.7 ± 3.69°, respectively. The G-GO0.2 anode with GO doped ratio of 0.2 mg·mg−1 exhibited the optimal performance and the maximum power density (Pmax) of the corresponding MFC was 1100.18 mW·m−2, 1.51 times higher than that of the MFC with the G anode.

Effect of bacterial growth stage on the response to two-dimensional nanomaterials

“…In this context, compatible nanosheets could promote electricity generation in MFCs by increasing electrode surface area, conductivity, cellular attachment, and extracellular electron transfer. [88][89][90][91][92][93][94][95][96][97] GO (ref. 91,92,94 and 95) and MoS 2 (ref.…”

“…88–97 GO (ref. 91, 92, 94 and 95) and MoS 2 (ref. 88 and 93) have already been shown to have some promise for this application.…”

Nanocomposite use in MFCs: a state of the art review

“…For instance, GO nanoparticles, which consist of graphene with a higher number of oxygen-containing functional groups, have also been combined with normal graphene to enhance the hydrophilicity and biocompatibility of the anode in MFCs, obtaining a power density 1.51 times higher than that of bare graphite anodes. 101 The main drawback of using GO is the high resistivity of the material. To increase the conductivity, rGO nanoparticles have also been widely used in MFC anodes, showing better performance than GO.…”