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Performance of membraneless MFCs with graphite and stainless steel electrodes

pubblicazioni - Presentazione

Performance of membraneless MFCs with graphite and stainless steel electrodes

Performance of membraneless MFCs with graphite and stainless steel electrodes.

The Microbial fuel cell (MFC) is an innovative electrochemical bio-technology promising to produce electricity from biomass. Marginal biomass contained in sediments or polluted natural waters could be enough to sustain the bio-electrochemical processes producing, in principle, energetic fuel (hydrogen), degradation of toxic as well as electricity. Simple, not expensive system have to be developed in order to promote the technology from laboratory scale to the field application. The present paper pointed out the capability of biofilm to induce the catalyses of both the anodic and cathodic semi-reactions in membraneless single chamber MFCs, using stainless steel or graphite electrodes with or without Platinum catalyst. The power trends of cells indicated how it is easy to obtain full effective microbial catalysed “biocathodes” after about two weeks operation. The electrical performances of the cells with biofilm on anode and cathode resulted improved in time independently of the presence of platinum catalyst. All cell current densities fell in the range of 0.1- 0.5 mA cm-2, with maximum power density of almost 50 W cm-2 (cathodic geometrical area). The high internal resistance and the contribute of anodic process most limited the current. The influence of the electrodes surfaces (anodic and cathodic) and the presence/absence of platinum at cathode was investigated and discussed.

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