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Improved performance Air bio-battery based on efficient oxygen supply with a gas/liquid highly-porous diaphragm cell. | LitMetric

Improved performance Air bio-battery based on efficient oxygen supply with a gas/liquid highly-porous diaphragm cell.

Biosens Bioelectron

Department of Biomedical Devices and Instrumentation, Institute of Biomaterials and Bioengineering, Tokyo Medical and Dental University, 2-3-10 Kanda-Surugadai, Chiyoda-ku, Tokyo 101-0062, Japan; Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Electronic address:

Published: January 2019

AI Article Synopsis

  • A glucose-driven bio-battery's performance was enhanced by optimizing its electrode design and improving oxygen supply to the cathode, leading to higher electricity generation.
  • The use of a flexible Pt electrode and a compact gas/liquid diaphragm cell boosted the maximum current and power densities significantly compared to previous designs, achieving 451 ± 27 μA/cm and 162 ± 7 μW/cm.
  • The bio-battery demonstrated stability over time, maintaining power generation with minimal decline and showing that increased oxygen supply directly enhances power density, indicating it could be a viable option for continuous power sources.

Article Abstract

Performance of a glucose-driven bio-battery was improved by enhancing electrode characteristics and oxygen supply efficiency to a cathode. The bio-battery generates electric power from glucose through three enzymatic reactions using glucose dehydrogenase, diaphorase and bilirubin oxidase. A flexible and thin Pt electrode was employed instead of a glassy carbon (GC) electrode on which enzymes, a coenzyme, and mediators were immobilized by layer-by-layer method. The maximum current and power densities of the constructed bio-battery were 257 ± 22 μA/cm and 86 ± 3 μW/cm, respectively, in 5 mM glucose solution. In addition, a newly designed compact gas/liquid diaphragm cell, which allowed to reduce the internal resistance by shortening the anode-cathode distance and enhance oxygen supply to a cathode using a highly-porous cotton mesh diaphragm, was implemented to the bio-battery to develop a high-performance Air bio-battery. As a result, improved Air bio-battery showed the maximum current and power densities of 451 ± 27 μA/cm and 162 ± 7 μW/cm, which was 3.6-fold improvement from the previous GC electrode-based bio-battery. In addition, continuous operation for 210 min revealed high stability of power generation as it decreased by 3.3% at the end of operation. Additional supply of oxygen to a cathode exhibited proportional increase of the power density to the oxygen concentration, which demonstrates a promising potential of Air bio-battery for a high-performance and continuous powering device.

Download full-text PDF

Source
http://dx.doi.org/10.1016/j.bios.2018.09.091DOI Listing

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