NDLI: Use of low cost and easily regenerated Prussian Blue cathodes for efficient electrical energy recovery in a microbial battery

Content Provider	Royal Society of Chemistry (RSC)
Author	Liu, Chong Criddle, Craig S. Xie, Xing Ye, Meng Hsu, Po-Chun Cui, Yi
Copyright Year	2015
Abstract	Microbial fuel cells can directly convert chemical energy into electrical energy, but significant energy losses result from the use of O2 as the cathode. Microbial batteries (MBs) replace conventional O2 cathodes with solid-state cathodes that can be re-oxidized under favorable conditions, enabling more efficient energy recovery. Previously, we demonstrated proof-of-concept for MBs with a silver oxide cathode. The high cost of silver and energy required for re-oxidation make this material impractical. In this work, we evaluate Prussian Blue (PB), a hexacyano-Fe complex material, as a low-cost solid-state cathode in a single-chamber, membrane-free MB. Microbial oxidation of organic matter at the anode drives the reduction of PB. Reduced PB is re-oxidized by exposure to air. MBs equipped with a PB electrode efficiently transfer charge to PB (85% charge transfer), achieving net energy recovery efficiencies of 18–33%, with no loss of capacity over 20 cycles of operation. The operating potential for the PB electrode creates a trade-off: increasing the PB electrode potential improves the efficiency of energy recovery, but more material is required to maintain power output and ensure efficient oxidation of organic matter. Operation is otherwise straightforward: energy is only required to move reduced PB into the air then back to the MB. We conclude that PB is a promising cathode material for single-chamber, membrane-free MBs.
Starting Page	546
Ending Page	551
Page Count	6
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	8
Issue Number	2
Journal	Energy & Environmental Science
DOI	10.1039/c4ee03268c
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Oxygen Cathode Energy recovery Silver oxide Prussian blue Anode Electrode Electrode potential
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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