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Fundamental Research on the Development of Bioelectrochemical Cells

生物电化学细胞发展的基础研究

基本信息

批准号：
09556023
负责人：
IKEDA Tokuji
金额：
$ 4.74万
依托单位：
KYOTO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1997
资助国家：
日本
起止时间：
1997 至 1998
项目状态：
已结题

项目摘要

1 Whole cells of Desulfovibrio vulgaris suspended in a buffer solution function as homogeneous catalysts to produce an electrochemical catalytic current for the production and consumption of H_<> in the presence of methyl viologen (MV). Analysis of the catalytic current by the theory of bioelectrocatalysis revealed that hydrogenase in the D.vulgaris cells function as a very effective catalyst to promote the indirect electrochemical redox reaction of H^+/H_2 couple. Thus, the reaction proceeds reversibly under such mild conditions as an ambient temperature at neutral pH.The rate of the reaction is calculated to be diffusion- controlled, indicating that the use of the bacterial cells is very promising for constructing a functional anode of bioelectrochemical cells.2 Similarly, Thiobacillus ferrooxidans functioned as a catalyst for the electorchemical reduction of O_<> to H_<>O when Fe(CN)_6^<3->/Fe(CN)_6^<4-> redox couple was employed as an electron transfer mediator between the bacteria … More l cells and an electrode. The conversion by T.ferrooxidans cells was also very effective to produce a large catalytic cathodic current for the consumption of O_2 in solution. However, the high catalytic activity was observed only at acidic pH.Consequently, T.ferrooxidans is concluded not to be a best choice as a biocatalyst for the electrochemical reduction of O_2 when we would like to operate bioelectrochemical cells at neutral pH.3 A.aceti catalyzes the oxidation of ethanol with 2-methyl-5,6-dimethoxy benzoquinone (Q_0) as an electron carrier. The electrocatalytic behavior was studied in detail, the theory of polarographic kinetic current was available for analyzing the catalytic current, from which the bimolecular rate constant between the bacterial cell and Q_0 could be calculated to be very large. This system is applicable to the construction of bioelectrochemical cells which use ethanol as a fuel.4 Carbon felt was briefly examined as an electrode of large scale current out put, and found to be very promising as an electrode material of bioelectrochemical cells. Less

1在甲基紫精（MV）存在下，悬浮于缓冲溶液中的脱硫弧菌（Desulfovibrio vulgaris）全细胞作为均相催化剂，产生一个产生和消耗H_（<1>）的电催化电流。用生物电催化理论分析了催化电流，结果表明，普通石斛细胞中的氢化酶对H^+/H_2电对的间接电化学氧化还原反应具有非常有效的催化作用。结果表明，该反应在室温、pH值为中性的温和条件下可逆进行，反应速率受扩散控制，表明该细菌细胞在构建生物电化学电池的功能阳极方面具有很好的应用前景。2同样，当Fe（CN）_6^ /Fe（CN）_6^氧化还原电对用作细菌之间的电子传递介质时，氧化亚铁硫杆菌（Thiobacillusferrooxidans）在O_<>还原为H_<>O的电化学还原中起催化<3-><4->作用 ...更多信息 L细胞和电极。氧化亚铁硫杆菌细胞的转化也是非常有效的，产生了一个大的催化阴极电流消耗溶液中的O_2。然而，高的催化活性，观察到只有在酸性pH值。因此，T.ferrooxidans的结论是不是一个最好的选择，作为一个生物催化剂的电化学还原O_2，当我们想在中性pH值的生物电化学电池。3 A.aceti催化乙醇氧化2-甲基-5，6-二甲氧基苯醌（Q_0）作为电子载体。详细研究了该催化剂的电催化行为，用极谱动力学电流理论分析了催化电流，并由此计算出细菌细胞与Q_0之间的双分子速率常数很大。该系统适用于使用乙醇作为燃料的生物电化学电池的构建。4碳毡作为大规模电流输出的电极进行了简要的研究，发现作为生物电化学电池的电极材料是非常有前途的。少