University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany.
University of Bremen, Advanced Ceramics, Am Biologischen Garten 2, IW3, 28359 Bremen, Germany; Department of Materials Engineering, Federal University of Santa Catarina (UFSC), 88040-900 Florianopolis, SC, Brazil.
Bioelectrochemistry. 2019 Oct;129:259-269. doi: 10.1016/j.bioelechem.2019.06.002. Epub 2019 Jun 8.
Proton-conducting porous ceramic membranes were synthesized via a polymer-derived ceramic route and probed in a microbial fuel cell (MFC). Their chemical compositions were altered by adding carbon allotropes including graphene oxide (GO) and multiwall carbon nanotubes into a polysiloxane matrix as filler materials. Physical characteristics of the synthesized membranes such as porosity, hydrophilicity, mechanical stability, ion exchange capacity, and oxygen mass transfer coefficient were determined to investigate the best membrane material for further testing in MFCs. The ion exchange capacity of the membrane increased drastically after adding 0.5 wt% of GO at an increment of 9 fold with respect to that of the non-modified ceramic membrane, while the oxygen mass transfer coefficient of the membrane decreased by 52.6%. The MFC operated with this membrane exhibited a maximum power density of 7.23 W m with a coulombic efficiency of 28.8%, which was significantly higher than the value obtained using polymeric Nafion membrane. Hence, out of all membranes tested in this study the GO-modified polysiloxane based ceramic membranes are found to have a potential to replace Nafion membranes in pilot scale MFCs.
质子传导多孔陶瓷膜是通过聚合物衍生陶瓷路线合成的，并在微生物燃料电池（MFC）中进行了探测。通过将包括氧化石墨烯（GO）和多壁碳纳米管在内的碳同素异形体添加到聚硅氧烷基质中作为填充材料，改变了它们的化学成分。合成膜的物理特性，如孔隙率、亲水性、机械稳定性、离子交换容量和氧传质系数，都被确定下来，以研究最适合进一步在 MFC 中测试的膜材料。与未改性的陶瓷膜相比，在添加 0.5wt%的 GO 后，膜的离子交换容量急剧增加了 9 倍，而膜的氧传质系数降低了 52.6%。使用这种膜的 MFC 表现出 7.23Wm 的最大功率密度和 28.8%的库仑效率，明显高于使用聚合物纳滤膜获得的值。因此，在本研究中测试的所有膜中，GO 改性的基于聚硅氧烷的陶瓷膜有望在中试规模的 MFC 中替代纳滤膜。
