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RISS 인기검색어
- 검색키워드
- 저자 : Uwe Schröder (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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Microfabricated, Continuous-flow, Microbial Three-electrode Cell for Potential Toxicity Detection
안유민,Uwe Schröder 한국바이오칩학회 2015 BioChip Journal Vol.9 No.1
Bioelectrochemical microfluidic devicesare developed based on the continuous flow mode ofmembrane-less, microbial three-electrode cells (M3Cs). These novel devices are the miniaturized microfluidic-based three-electrode cells for the first time, andthese are composed of an Ag/AgCl reference electrode,indium tin oxide anode and cathode electrodes. The basic performance of the devices is tested usingbiofilms grown from wastewater inoculum in an experimentthat senses for toxic materials. The toxic materialsused are: sodium cyanide, imidazole, and sodiumazide in concentrations of 0.02-0.8 mM, with lactateand sodium acetate functioning as substrates. While aconstant potential of 0.2 V is applied to the workingelectrodes of the device, the bioelectrocatalytic oxidationcurrent is monitored at 35C. When the biocidesare introduced, the response current from the cell decreases. The sensor can detect imidazole at the range of0.02-0.4 mM. The experimental results show the potentialof using microfluidic-based microbial electrolysiscells not only as biocide sensors, but also as investigativetools for microbial electrochemical assays.
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Parylene C-coated PDMS-based microfluidic microbial fuel cells with low oxygen permeability
Yoon, Joon Yong,Ahn, Yoomin,Schrö,der, Uwe Elsevier 2018 Journal of Power Sources Vol.398 No.-
<P><B>Abstract</B></P> <P>Oxygen invasion is the main bottleneck in developing microscale microbial fuel cells as an efficient power source. This study reports for the first time the development of a polydimethylsiloxane -based co-laminar microbial fuel cell utilizing a parylene C coating to lower the oxygen permeability. In addition, the surface of the Au electrode is micropillar-structured to reduce the internal resistance of the microbial fuel cell. The performance of this novel microfluidic microbial fuel cell is investigated under various flow rates of electrolytes. The shear stress simulation shows that shear stress, induced by increasing flow rates, strongly impacts the biofilm electrode performance. To the best of our knowledge, the measured peak power density (71.89 ± 5.13 μW cm<SUP>−2</SUP>) and maximum current density (182.0 ± 4.82 μA cm<SUP>−2</SUP>) with the structured electrode are higher than those of any other reported polydimethylsiloxane-based microscale microbial fuel cells. The proposed microbial fuel cell appears to be a promising power supply that can be easily integrated with portable or implantable biomedical devices.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A parylene C coating is proposed to reduce the oxygen permeability of a PDMS-based micro MFC. </LI> <LI> The power density and sustained time of the MFC were improved by coating PDMS with parylene C. </LI> <LI> The structured electrode shows better cell performance than a flat electrode. </LI> <LI> There is an optimal electrolyte flow rate that generates the best co-laminar MFC performance. </LI> <LI> The optimal flow rate depends on the biofilm, which is affected by the shear stress of the stream. </LI> </UL> </P>
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