NDLI: Capacitive mixing power production from salinity gradient energy enhanced through exoelectrogen-generated ionic currents

Content Provider	Royal Society of Chemistry (RSC)
Author	Logan, Bruce E. Hatzell, Marta C. Cusick, Roland D.
Copyright Year	2014
Abstract	Several approaches to generate electrical power directly from salinity gradient energy using capacitive electrodes have recently been developed, but power densities have remained low. By immersing the capacitive electrodes in ionic fields generated by exoelectrogenic microorganisms in bioelectrochemical reactors, we found that energy capture using synthetic river and seawater could be increased ∼65 times, and power generation ∼46 times. Favorable electrochemical reactions due to microbial oxidation of organic matter, coupled to oxygen reduction at the cathode, created an ionic flow field that enabled more effective passive charging of the capacitive electrodes and higher energy capture. This ionic-based approach is not limited to the use of river water-seawater solutions. It can also be applied in industrial settings, as demonstrated using thermolytic solutions that can be used to capture waste heat energy as salinity gradient energy. Forced charging of the capacitive electrodes, using energy generated by the bioelectrochemical system and a thermolytic solution, further increased the maximum power density to 7 W m−2 (capacitive electrode).
Starting Page	1159
Ending Page	1165
Page Count	7
File Format	HTM / HTML PDF
ISSN	17545692
Volume Number	7
Issue Number	3
Journal	Energy & Environmental Science
DOI	10.1039/c3ee43823f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Salinity Bioelectrochemistry Electrochemistry Oxygen Cathode Waste heat Electrode
Content Type	Text
Resource Type	Article
Subject	Environmental Chemistry Pollution Renewable Energy, Sustainability and the Environment Nuclear Energy and Engineering

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