Department of Chemical Sciences and Bernal Institute, University of Limerick, Limerick, Ireland.
School of Chemistry & Ryan Institute, National University of Ireland Galway, Galway, Ireland.
Biosens Bioelectron. 2017 Dec 15;98:421-427. doi: 10.1016/j.bios.2017.07.023. Epub 2017 Jul 11.
Enzymatic biofuel cells can generate electricity directly from the chemical energy of biofuels in physiological fluids, but their power density is significantly limited by the performance of the cathode which is based on oxygen reduction for in vivo applications. An oxygen-independent and membrane-less glucose biobattery was prepared that consists of a dealloyed nanoporous gold (NPG) supported glucose dehydrogenase (GDH) bioanode, immobilised with the assistance of conductive polymer/Os redox polymer composites, and a solid-state NPG/MnO cathode. In a solution containing 10mM glucose, a maximum power density of 2.3µWcm at 0.21V and an open circuit voltage (OCV) of 0.49V were registered as a biobattery. The potential of the discharged MnO could be recovered, enabling a proof-of-concept biobattery/supercapacitor hybrid device. The resulting device exhibited a stable performance for 50 cycles of self-recovery and galvanostatic discharge as a supercapacitor at 0.1mAcm over a period of 25h. The device could be discharged at current densities up to 2mAcm supplying a maximum instantaneous power density of 676 μW cm, which is 294 times higher than that from the biobattery alone. A mechanism for the recovery of the potential of the cathode, analogous to that of RuO (Electrochim. Acta 42(23), 3541-3552) is described.
酶生物燃料电池可以直接从生理液中的生物燃料的化学能中产生电能，但它们的功率密度受到阴极性能的显著限制，阴极的性能基于体内应用中的氧还原。本文制备了一种无需氧气和无膜的葡萄糖生物电池，它由脱合金纳米多孔金（NPG）支撑的葡萄糖脱氢酶（GDH）生物阳极组成，在导电聚合物/Os 氧化还原聚合物复合材料的协助下固定，以及固态 NPG/MnO 阴极。在含有 10mM 葡萄糖的溶液中，以 0.21V 记录到 2.3µWcm 的最大功率密度和 0.49V 的开路电压（OCV），作为生物电池。放电 MnO 的电势可以恢复，从而实现了生物电池/超级电容器混合器件的概念验证。所得装置作为超级电容器在 0.1mAcm 下进行 50 个自恢复和恒流放电循环的稳定性能，在 25 小时内的稳定性能为 25 小时。该装置可以在高达 2mAcm 的电流密度下放电，提供高达 676 μW cm 的最大瞬时功率密度，比单独的生物电池高出 294 倍。描述了一种类似于 RuO（Electrochim. Acta 42(23), 3541-3552）的阴极电势恢复机制。
