Nanostructured three-dimensional Reduced Graphene Oxide- Mn3O4 Architectures with High Conductivity and Bacteria Affinity for Highly Efficient Microbial Electrocatalysis
International Journal of Electrochemical Science
Bioelectrochemical system (BES) exhibits great potential for the wastewater treatment, which can achieve the energy storage simultaneously. However, the application of BES is limited due to the interior structure and composition of electrode materials. Here, a hybrid nano-structure reduced graphene oxide-Mn3O4 (rGO@Mn3O4) electrode was obtained through one-step electrodeposition method, and utilized to enhance the performance of Geobacter sulfurreducens inoculated BES. The hierarchical
... erarchical rGO@Mn3O4 is equipped with open porous and higher surface roughness, which are favorable for the microbial colonization. And the electron transport from exoelectrogens to the electrode facilitated by the three-dimensional interconnecting conductive scaffold. Further, the rGO@Mn3O4 electrode realized the maximum current density in a three-electrode setup reached 0.0376 mA cm −2 with high loading, which is 3.03-fold higher than that of a bare rGO (0.0124 mA cm −2 ). The great performance is attributed to the proper pore size distribution and the "rose"-like porous structure Mn3O4 particles coating on the surface of the rGO sheets network. This work reveals a synergistic effect in pore structure and surface chemistry design to promote bioelectrocatalysis in BESs.