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RISS 인기검색어
- 검색키워드
- 저자 : Prabhat K. Dwivedi (검색결과 3 건)
- 무료
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- 유료
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Screening various pencil leads coated with MWCNT and PANI as enzymatic biofuel cell biocathode
Bandapati, Madhavi,Dwivedi, Prabhat K.,Krishnamurthy, Balaji,Kim, Young Ho,Kim, Gyu Man,Goel, Sanket Elsevier 2017 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.42 No.44
<P><B>Abstract</B></P> <P>Research in Enzymatic Biofuel cells (EBFCs) has evolved during the last decade. However, challenges, such as cost and endurance are the bottlenecks in harnessing their commercialization potential. To overcome these challenges, low cost, readily available pencil leads of various grades modified with polyaniline (PANI) and multi walled carbon nano tubes (MWCNT) have been examined as EBFC biocathode. Total four pencils of various grades (B, H, 3H, and 5H) were used to fabricate biocathode by covalently immobilizing Laccase(Lac) enzyme on to MWCNT coated (BC<SUB>1</SUB>) and electrodeposited polyaniline and MWCNT coated (BC<SUB>2</SUB>) on the surface of pencil graphite electrodes (PGEs). The fabricated biocathodes were characterized by scanning electron microscopy (SEM), BET surface area and conductivity measurements and electrochemical analysis was performed by the Open circuit potential (OCP) and Cyclic voltammetry (CV). Among the pencils tested in this work, the 5H pencil coated with PANI/MWCNT/Lacexhibited highest current density of 1209.23 μA/cm<SUP>2</SUP> with OCP of 0.528 V. Moreover, the PANI/MWCNT/Lac modified PGEs showed significant enhancement (80%) in electrochemical behavior when compared with unmodified (bare) and MWCNT/Lac coated PGE. Both types of Bioelectrodes (PGE/MWCNT/Lac,PGE/PANI/MWCNT/Lac) showed good stability and maximum conservation of its activity during the experiments.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Evaluating H, 3H, 5H, B Pencil leads for potential biocathode for EBFC application. </LI> <LI> Surface and Electrochemical Characterization of fabricated biocathodes are performed. </LI> <LI> Comparison of various pencil graphite electrodes with and without polyaniline coating is evaluated. </LI> <LI> The highest current density was observed for polyaniline and MWCNT coated 5H Pencil. </LI> </UL> </P>
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Fabrication of an Enzymatic Biofuel Cell with Electrodes on Both Sides of a Microfluidic Channel
Haroon Khan,김철민,Sung Yeol Kim,Sanket Goel,Prabhat K. Dwivedi,Ashutosh Sharma,김영호,Gyu Man Kim 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.6 No.3
Enzymatic biofuel cells (EBFCs) that utilize glucose as fuel in a human body to produce electricity are being explored as promising alternatives to power implantable devices. However, some limitations need to be overcome to render such micro-electronic devices practically applicable. Here, we propose a microfluidic EBFC architecture with electrodes on both sides of the microchannel and its fabrication via stencil method. Multiwalled carbon nanotube (MWCNT) electrodes are fabricated on both sides of a Y-shaped microfluidic channel to reduce the effect of the depletion boundary layer and cross-diffusional mixing of the fuel and oxidant, which are functions of the distance from the microchannel inlet. Therefore, the microchannel length is reduced by half, while maintaining the same MWCNT electrode area. The microchannel is produced by polydimethylsiloxane (PDMS) casting whereas the electrodes are fabricated by a PDMS stencil, using MWCNT patterned on etched indium tin oxide glass. The electrodes are modified with glucose oxidase and laccase via direct covalent bonding. The cell performance is studied at different microchannel heights and flow rates, obtaining a maximum power and current density of 153 µW cm−2 and 450 µA cm−2, respectively, at a microchannel height of 450 µm and flow rate of 25 mL h−1. The double-layer EBFC shows a 23% improvement in the performance compared to a single-layer EBFC.
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