Modelling of Reaction and Diffusion Processes in a High‐surface‐area Biofuel Cell Electrode Made of Redox Polymer‐grafted Carbon

Tamaki, Takanori; Ito, Taichi; Yamaguchi, Takeo

doi:10.1002/fuce.200800028

Cited by 31 publications

(62 citation statements)

References 43 publications

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“…Analytical [32][33][34][35] and Numerical [36][37][38][39][40][41][42][43][44] modeling are useful, although arguably underutilized, tools for understanding enzymatic biofuel cell operational mechanisms. In an effort to better understand CNT-related limitations in enzymatic biofuel cell electrodes, especially those using DET, we built a series of prototypes and simulations that are reported herein.…”

Section: Introductionmentioning

confidence: 99%

Modeling Carbon Nanotube Connectivity and Surface Activity in a Contact Lens Biofuel Cell

Reid

Jones

Hickey

et al. 2016

Electrochimica Acta

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Biofuel cells are often limited by the current density produced by the cathode; this is especially true when such fuel cells are scaled down to fit a desired application. Herein, we created a computational model to examine the effects of carbon nanotube (CNT) connectivity and surface activity on the current density of a biofuel cell cathode. The model was motivated by the creation of a novel contact lens biofuel cell that, although more stable and biocompatible than previously reported designs, was cathode limited.The device produced a maximum current density of 22 ± 4 µA cm -2 , and a maximum power density of 2.4 ± 0.9 µW cm -2 (at 0.163 V) with an open-circuit voltage of 0.44 ± 0.08 V. Computational results showed that in a Nafion film containing 1.6% CNTs by volume, less than 20% of the CNT fibers were connected to the electrode, assuming a planar electrode. The simulations predicted that a three-fold increase in CNT loading would lead to a roughly two-fold increase in total CNT connectivity. The simulations further estimated that for the CNTs connected to the electrode, only 21% of their sidewalls were contributing to cathodic current, meaning that the remaining surfaces were not electrochemically active. Given the low bilirubin oxidase (BOD) enzyme surface concentration, which was experimentally found to be 1.24 x 10 -13 mol cm -2 , it is likely that large portions of the CNT surfaces are not connected to enzymes. This result validates the push by the research community to increase BOD and laccase adsorption/orientation to CNT surfaces.

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Section: Introductionmentioning

confidence: 99%

Modeling Carbon Nanotube Connectivity and Surface Activity in a Contact Lens Biofuel Cell

Reid

Jones

Hickey

et al. 2016

Electrochimica Acta

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“…When the mediator is confined within the electrode, the initial and boundary conditions become as follows [11,36]:…”

Section: Case (Ii): Homogeneous System In the Presence Of Excess Amoumentioning

confidence: 99%

Analytical expression of transient and steady-state catalytic current of mediated bioelectrocatalysis

Rajendran¹,

Saravanakumar²

2014

Electrochimica Acta

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“…The current density j is related to the flux of mediator reacting at the electrode [110,113,114,116]:…”

Section: Modeling Of Enzymatic Electrodesmentioning

confidence: 99%

Recent Advances in Enzymatic Fuel Cells: Experiments and Modeling

2010

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Enzymatic fuel cells convert the chemical energy of biofuels into electrical energy. Unlike traditional fuel cell types, which are mainly based on metal catalysts, the enzymatic fuel cells employ enzymes as catalysts. This fuel cell type can be used as an implantable power source for a variety of medical devices used in modern medicine to administer drugs, treat ailments and monitor bodily functions. Some advantages in comparison to conventional fuel cells include a simple fuel cell design and lower cost of the main fuel cell components, however they suffer from severe kinetic limitations mainly due to inefficiency in electron transfer between the enzyme and the electrode surface. In this review article, the major research activities concerned with the enzymatic fuel cells (anode and cathode development, system design, modeling) by highlighting the current problems (low cell voltage, low current density, stability) will be presented. © 1996-2010 MDPI Publishing (Basel, Switzerland) [accessed May 7, 2010

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Modelling of Reaction and Diffusion Processes in a High‐surface‐area Biofuel Cell Electrode Made of Redox Polymer‐grafted Carbon

Cited by 31 publications

References 43 publications

Modeling Carbon Nanotube Connectivity and Surface Activity in a Contact Lens Biofuel Cell

Modeling Carbon Nanotube Connectivity and Surface Activity in a Contact Lens Biofuel Cell

Analytical expression of transient and steady-state catalytic current of mediated bioelectrocatalysis

Recent Advances in Enzymatic Fuel Cells: Experiments and Modeling

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