Biochar as a sustainable electrode material for electricity production in microbial fuel cells
By Huggins, Tyler; Wang, Heming; Kearns, Joshua; Jenkins, Peter & Ren, Zhiyong Jason
Published in Bioresource Technology
NULL
2014
Abstract
Wood-based biochars were used as microbial fuel cell electrodes to significantly reduce cost and carbon footprint. The biochar was made using forestry residue (BCc) and compressed milling residue (BCp). Side-by-side comparison show the specific area of BCp (469.9 m2 g-1) and BCc (428.6 cm2 g-1) is lower than granular activated carbon (GAC) (1247.8 m2 g-1) but higher than graphite granule (GG) (0.44 m2 g-1). Both biochars showed power outputs of 532 ± 18 mW m-2 (BCp) and 457 ± 20 mW m-2 (BCc), comparable with GAC (674 ± 10 mW m-2) and GG (566 ± 5 mW m-2). However, lower material expenses made their power output cost 17–35 US$ W-1, 90% cheaper than GAC (402 US$ W-1) or GG (392 US$ W-1). Biochar from waste also reduced the energy and carbon footprint associated with electrode manufacturing and the disposal of which could have additional agronomic benefits.
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