A miniature biofuel cell
A miniature biofuel cell
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DOI：
10.1021/ja0163164
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发表时间：
2001-09-05
影响因子：
15
通讯作者：
Heller, A
中科院分区：
文献类型：
--
作者：
Chen, T;Barton, SC;Heller, A
描述了一种由两根直径为7 μm、长为2cm的碳纤维组成的生物燃料电池，该电池在室温下在pH为5的水溶液中工作。该电池的阳极和阴极的面积比所报道的最小（甲醇氧化）燃料电池1的面积小60倍，比最小面积生物燃料电池的面积小180倍。2电池的功率密度超过早期生物燃料电池的最高功率密度的5倍。3微阳极的电催化膜催化葡萄糖电氧化为右旋内酯（等式1）; 2-7微阴极的电催化膜催化O2电还原为水（等式2）。8-10阳极上的膜由葡萄糖氧化酶（GOx）的交联静电加合物和0.1 V（相对于Ag/AgCl）氧化还原电位的电子导电氧化还原聚合物组成，该聚合物将GOx氧化还原中心电连接到一根纤维。阴极的膜由漆酶和0.55V（vs Ag/AgCl）电子传导氧化还原聚合物组成，将漆酶氧化还原中心电连接到第二纤维。电池的功率密度在23 C时为64 μW/cm 2，在37 C时为137 μW/cm 2，其功率输出在23 C时为280 nW，在37 C时为600 nW。虽然电子封装的尺寸在过去几十年中不断缩小，并且功耗降低的CMOS电路变得可用，但其电源的尺寸并未按比例减小。在能量容量不是尺寸决定因素的应用中，相对于芯片封装，电源仍然很大，因为它的外壳和密封很难密封。在阳极与水或空气反应，或者电解质具有腐蚀性的电池中，外壳和密封是必要的。高能量密度电池的锂阳极在潮湿空气中会被氧化;锌-空气和锌-氧化银电池的碱性电解液具有腐蚀性。小型锂电池和小型锌银氧化物电池的占地面积> 10 mm 2。最小的燃料电池，25平方毫米的大小，
A biofuel cell, consisting of two 7-μm diameter, 2-cm long carbon fibers and operating at ambient temperature in a pH 5 aqueous solution is described. The areas of the anode and the cathode of the cell are 60 times smaller than those of the smallest reported (methanol oxidizing) fuel cell1 and 180 times smaller than those of the smallest area biofuel cell. 2 The power density of the cell exceeds by a factor of 5 that of the highest power density earlier biofuel cell. 3 The electrocatalytic film of the microanode catalyzes the electrooxidation of glucose to gluconolactone (eq 1); 2-7 that of the microcathode catalyzes the electroreduction of O2 to water (eq 2). 8-10 The film on the anode consists of the cross-linked electrostatic adduct of glucose oxidase (GOx) and a 0.1 V (vs Ag/AgCl) redox potential electron-conducting redox polymer, which electrically connects the GOx redox centers to one fiber. The film of the cathode consists of laccase and a 0.55 V (vs Ag/AgCl) electron-conducting redox polymer, electrically connecting the laccase redox centers to the second fiber. The power density of the cell is 64 μW/cm2 at 23 C and 137 μW/cm2 at 37 C, and its power output is 280 nW at 23 C and 600 nW at 37 C.While the dimensions of electronic packages were shrinking through the past decades and CMOS circuits of reduced power consumption became available, 11 the size of their power source was not proportionately reduced. In applications where energy capacity was not the size-determining factor, the power source remained large, relative to the chip package because its case and seal were difficult to miniaturize. The case and the seal were necessary in batteries where the anode reacted with water or air, or if the electrolyte was corrosive. The lithium anode of highenergy density batteries is oxidized in humid air; the alkaline electrolyte of zinc-air and zinc-silver oxide batteries is corrosive. Small lithium and small zinc-silver oxide batteries have footprints of> 10 mm2. The smallest reported fuel cell, of 25-mm2 size,