A three-dimensional nitrogen-doped graphene aerogel-activated carbon composite catalyst that enables low-cost microfluidic microbial fuel cells with superior performance

作者：Yang, Yang; Liu, Tianyu; Liao, Qiang; Ye, Dingding^*; Zhu, Xun; Li, Jun; Zhang, Pengqing; Peng, Yi; Chen, Shaowei; Li, Yat^*

来源：Journal of Materials Chemistry A, 2016, 4(41): 15913-15919.

DOI：10.1039/c6ta05002f

• OXYGEN REDUCTION REACTION
• SYNERGISTIC CATALYST
• BIOFILM DISTRIBUTION
• NANOTUBE ANODE
• POWER-DENSITY
• BIOFUEL CELL
• AIR-CATHODE
• ELECTRODE
• SCAFFOLD
• NITRIDE

Microfluidic microbial fuel cells (mu MFCs) are promising miniaturized power generators and bio-sensors, which combine the micro-fabrication process with bio-chip technology. However, a limited power output and considerable cost severely restrict their practical applications. Previous research has revealed that inadequate colonization of bacteria on bio-anodes as well as sluggish oxygen reduction reaction (ORR) kinetics are two main causes for the unsatisfactory power output. In this study, we have demonstrated a mu MFC that has successfully addressed the aforementioned limitations by utilizing lowcost self-assembled reduced graphene oxide-nickel (rGO@Ni) foam and a nitrogen-doped graphene aerogel-activated carbon (AC@N-GA) as the bio-anode and air-cathode electrodes, respectively. The three-dimensional and macro-porous structure of the rGO@Ni foam provides a large surface area for bacterial colonization and hence largely increases the loading amount of bacterial cells. The AC@N-GA electrode shows excellent ORR catalytic performance due to the meso-porous structure and the presence of nitrogen functionalities that can serve as the catalytic sites. As a result, the mu MFC achieves a maximum power density of 1181.4 +/- 135.6 W m(-3) (continuous-mode) and 690.2 +/- 62.3 W m(-3) (batch-mode) evaluated based on the volume of the reactor (50 mu L). To our knowledge, this is the highest volumetric power density reported for air-breathing mu MFCs and microfluidic glucose fuel cells with a similar configuration. Besides, the utilization of the inexpensive electrodes and membrane-free architecture could significantly decrease the fabrication cost of mu MFCs.

• 出版日期2016
• 单位重庆大学