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 (469.9m2g-1) and BCc (428.6cm2g-1) is lower than granular activated carbon (GAC) (1247.8m2g-1) but higher than graphite granule (GG) (0.44m2g-1). Both biochars showed power outputs of 532±18mWm-2 (BCp) and 457±20mWm-2 (BCc), comparable with GAC (674±10mWm-2) and GG (566±5mWm-2). However, lower material expenses made their power output cost 17-35US$W-1, 90% cheaper than GAC (402US$W-1) or GG (392US$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.
All Science Journal Classification (ASJC) codes
- Environmental Engineering
- Renewable Energy, Sustainability and the Environment
- Waste Management and Disposal
- Microbial fuel cell