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Composition and distribution of internal resistance in an enzymatic fuel cell and its dependence on cell design and operating conditions

机译：酶促燃料电池中内阻的组成和分布及其对细胞设计和操作条件的依赖性

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摘要

A variety of sugar-based enzymatic fuel cells (EFCs) are able to completely oxidize fuels catalyzed by enzyme cascades, achieving high energy densities. However, the poor power output of EFCs limits their potential applications. In the present study, the composition of internal resistance throughout the EFCs affected by various factors, including the separator, enzyme loading, electron acceptor, applied voltage and operation time, was characterized by electrochemical impedance spectroscopy (EIS). Total resistance is divided into solution-separator resistance, charge transfer resistance, and diffusion resistance, respectively. The Nafion 212 membrane was found to yield a small solution-separator resistance and a high power density. Increased enzyme loading led to reduced internal resistance and improved cell performance, generating a maximum power density of 0.17 mW cm ~(?2) . Using potassium ferricyanide to replace oxygen as the electron acceptor could improve cathode performance significantly and resulted in a 4-fold increase in the power density. EIS was also performed for EFCs operated continuously for 16 h. Power output decreased distinctly over time, while the internal resistance, primarily the diffusion resistance, increased. Additionally, altering operation voltages had an impact on diffusion resistances. These results can be summarized that diffusion plays a rather important role in deciding the power and future efforts should be made towards increasing the mass transfer in EFCs.
机译：各种基于糖的酶促燃料电池（EFC）能够完全氧化通过酶级联催化的燃料，实现高能量密度。但是，EFCS的差功率输出限制了它们的潜在应用。在本研究中，通过电化学阻抗光谱（EIS）的特征在于各种因素影响的整个EFC的内阻的内阻组合物，包括分离器，酶负载，电子受体，施加的电压和操作时间。总阻力分别分别分为溶液 - 分离电阻，电荷转移电阻和扩散阻力。发现Nafion 212膜产生小的溶液分离器电阻和高功率密度。增加的酶加载导致内阻降低和改善的电池性能，产生0.17mW cm〜（Δ2）的最大功率密度。使用铁氰化物替代氧气，因为电子受体可以显着改善阴极性能，导致功率密度增加4倍。 EIS也对连续操作的EFC进行16小时进行。电源输出随时间明显减少，而内阻主要是漫射电阻，增加。另外，改变操作电压对扩散电阻产生了影响。这些结果可以概述，扩散在决定电力和未来努力方面应该对增加EFC中的传质作出相当重要的作用。

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