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- Title
Biorefining of precious metals from wastes: an answer to manufacturing of cheap nanocatalysts for fuel cells and power generation via an integrated biorefinery?
- Authors
Ping Yong; Mikheenko, Iryna P.; Deplanche, Kevin; Redwood, Mark D.; Macaskie, Lynne E.
- Abstract
Bio-manufacturing of nano-scale palladium was achieved via enzymatically-mediated deposition of Pd from solution using Desulfovibrio desulfuricans, Escherichia coli and Cupriavidus metallidurans. Dried 'Bio-Pd' materials were sintered, applied onto carbon papers and tested as anodes in a proton exchange membrane (PEM) fuel cell for power production. At a Pd(0) loading of 25% by mass the fuel cell power using Bio-Pd (positive control) and Bio-Pd (negative control) was ~140 and ~30 mW respectively. Bio-Pd was intermediate between these with a power output of ~60 mW. An engineered strain of E. coli (IC007) was previously reported to give a Bio-Pd that was >3-fold more active than Bio-Pd of the parent E. coli MC4100 (i.e. a power output of >110 mW). Using this strain, a mixed metallic catalyst was manufactured from an industrial processing waste. This 'Bio-precious metal' ('Bio-PM') gave ~68% of the power output as commercial Pd(0) and ~50% of that of Bio-Pd when used as fuel cell anodic material. The results are discussed in relation to integrated bioprocessing for clean energy.
- Subjects
PRECIOUS metals; FUEL cells; ESCHERICHIA coli; PROTON exchange membrane fuel cells; LIFE sciences
- Publication
Biotechnology Letters, 2010, Vol 32, Issue 12, p1821
- ISSN
0141-5492
- Publication type
Article
- DOI
10.1007/s10529-010-0378-6