کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10395424 | 888977 | 2011 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of surface roughness, biofilm coverage and biofilm structure on the electrochemical efficiency of microbial cathodes
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تکنولوژی و شیمی فرآیندی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Effect of surface roughness, biofilm coverage and biofilm structure on the electrochemical efficiency of microbial cathodes Effect of surface roughness, biofilm coverage and biofilm structure on the electrochemical efficiency of microbial cathodes](/preview/png/10395424.png)
چکیده انگلیسی
Biofilms of Geobacter sulfurreducens were formed under chronoamperometry at â0.5 V and â0.6 V vs. Ag/AgCl on stainless steel cathodes and tested for fumarate reduction. Increasing the surface roughness Ra from 2.0 μm to 4.0 μm increased currents by a factor of 1.6. The overall current density increased with biofilm coverage. When the current density was calculated with respect to the biofilm-coated area only, values up to 280 A/m2 were derived. These values decreased with biofilm coverage and indicated that isolated cells or small colonies locally provide higher current density than dense colonies. Steel composition affected the current values because of differences in biofilm structure and electron transfer rates. Biofilms formed under polarisation revealed better electrochemical characteristics than biofilm developed at open circuit. This work opens up new guidelines for the design of microbial cathodes: a uniform carpet of isolated bacteria or small colonies should be targeted, avoiding the formation of large colonies.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Bioresource Technology - Volume 102, Issue 3, February 2011, Pages 2678-2683
Journal: Bioresource Technology - Volume 102, Issue 3, February 2011, Pages 2678-2683
نویسندگان
L. Pons, M.-L. Délia, A. Bergel,