Modeling and Simulation of Enzymatic Biofuel Cells with Three-Dimensional Microelectrodes

Song, Yin; Penmatsa, Varun; Wang, Chunlei

doi:10.3390/en7074694

Cited by 24 publications

(15 citation statements)

References 48 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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“…In this research, the prototype design of an EBFC chip, having 3D intedigitated microelectrode arrays was proposed [25]. The objective of this study is to obtain an optimum design of 3D microelectrode arrays for C-MEMS based EBFCs.…”

Section: Optimization Of 3d Microelectrode Arrays For Ebfcsmentioning

confidence: 99%

Micro enzymatic biofuel cells: from theoretical to experimental aspect

Song

Agrawal

Wang

2015

Energy Harvesting and Storage: Materials, Devices, and Applications VI

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Miniaturized enzymatic biofuel cells (EBFCs) that convert biological energy into electrical energy by using enzymemodified electrodes are considered as one of the promising candidates to power the implantable medical devices and portable electronics. However, their low power density and insufficient cell lifetime are two big obstacles to need to be tackled before EBFCs become viable for practical application. In this study, the theoretical simulation of this EBFC system is conducted using finite element analysis from COMSOL 4.3a in terms of cell performance, efficiency and optimum cell configurations. We optimized the electrodes design in steady state based on a three dimensional EBFC chip and studied the effect of orientation of the microelectrode arrays in blood artery. In the experimental part, we demonstrated an EBFC system that used 3D micropillar arrays integrated with graphene/enzyme composites. The fabrication process of this system combined top-down carbon microelectromechanical system (CMEMS) technology to fabricate the 3D micropillar arrays platform and bottom-up electrophoretic deposition (EPD) to deposit graphene/enzyme composite onto the 3D micropillar arrays. The amperometric response of the graphene based bioelectrodes exhibited excellent electrochemical performance and the 3D graphene/enzyme based EBFC generated a maximum power density of 136.3 μWcm -2 at 0.59 V, which is about 7 times of the maximum power density of the bare 3D carbon based EBFC.

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“…Just carbon, hydrogen, and sulphur are involved in the exothermic reaction with air oxygen-autogenous burning. Oxygen involved in fuel works as an oxidant, and nitrogen is the only part which is not involved in burning [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Economic Analysis of Diesel-Fuel Replacement by Crude Palm Oil in Indonesian Power Plants

Procházka

Hönig

2018

Energies

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Indonesia needs to find an alternative fuel to substitute diesel in their power plants in order to reduce the use of nonrenewable energy sources. The Indonesian government has a target to reduce oil fuel consumption while improving the efficiency of energy utilization. Crude palm oil is proposed to be used for this substitution. In this paper, the authors conduct an economic analysis of the replacement of diesel by crude palm oil. To predict future prices, a time series analysis is conducted using AutoRegressive Integrated Moving-Average method. A financial analysis of a specific project (0.75-MW power plant) is conducted using static financial indicators (payback period, return on investment). Results show that replacing diesel with crude palm oil may be profitable. This is especially true for the proposed prospects of diesel price evolution. Analysis shows that the price of crude oil, which is the main factor in the pricing of diesel, may go up. Also, recently Indonesian currency depreciated against the US dollar, which also implies a higher cost of diesel.

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Modeling and Simulation of Enzymatic Biofuel Cells with Three-Dimensional Microelectrodes

Cited by 24 publications

References 48 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

Micro enzymatic biofuel cells: from theoretical to experimental aspect

Economic Analysis of Diesel-Fuel Replacement by Crude Palm Oil in Indonesian Power Plants

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