2 results
Now showing1 - 2 of 2
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , How does the choice of anode material influence electrical performance? A comparison of two microbial fuel cell model organismsThe influence of the anode material on the electrical performance of the two microbial fuel cell model organisms Geobacter sulfurreducens and Shewanella oneidensis is investigated. High-surface-area activated carbon and low-surface-area graphite felt are compared in terms of polarization curves under quasi-steady-state conditions. Unexpectedly, G. sulfurreducens exhibits similar current densities up to 700μAcm-2 independent of the anode material. This is ~50% higher than steady-state values reported previously. The negligible influence of electrode material on the electrical performance of G. sulfurreducens is attributed to the fact that it performs only direct electron transfer, but forms thick biofilms. In contrast, S. oneidensis, relying mainly on mediated electron transfer, apparently makes better use of high-surface-area activated carbon and achieves higher current densities compared to graphite felt. This underlines the importance of tailoring anode materials according to the used organisms.Publicationtype: Journal Article27 - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Access status: without files , Systematic screening of carbon-based anode materials for microbial fuel cells with Shewanella oneidensis MR-1We present a systematic screening of carbon-based anode materials for microbial fuel cells with Shewanella oneidensis MR-1. Under anoxic conditions nanoporous activated carbon cloth is a superior anode material in terms of current density normalized to the projected anode area and anode volume (24.0±0.3μAcm-2 and 482±7μAcm-3 at -0.2 vs. SCE, respectively). The good performance can be attributed to the high specific surface area of the material, which is available for mediated electron transfer through self-secreted flavins. Under aerated conditions no influence of the specific surface area is observed, which we attribute to a shift from primary indirect electron transfer by mediators to direct electron transfer via adherent cells. Furthermore, we show that an aerated initial growth phase enhances the current density under subsequent anoxic conditions fivefold when compared to a similar experiment that was conducted under permanently anoxic conditions.Publicationtype: Journal ArticleScopus© Citations 63 16