1] Biological Systems Engineering Department, Virginia Tech, 304 Seitz Hall, Blacksburg, Virginia 24061, USA [2] Cell Free Bioinnovations Inc., 2200 Kraft Drive, Suite 1200B, Blacksburg, Virginia 24060, USA.
Cell Free Bioinnovations Inc., 2200 Kraft Drive, Suite 1200B, Blacksburg, Virginia 24060, USA.
Nat Commun. 2014;5:3026. doi: 10.1038/ncomms4026.
High-energy-density, green, safe batteries are highly desirable for meeting the rapidly growing needs of portable electronics. The incomplete oxidation of sugars mediated by one or a few enzymes in enzymatic fuel cells suffers from low energy densities and slow reaction rates. Here we show that nearly 24 electrons per glucose unit of maltodextrin can be produced through a synthetic catabolic pathway that comprises 13 enzymes in an air-breathing enzymatic fuel cell. This enzymatic fuel cell is based on non-immobilized enzymes that exhibit a maximum power output of 0.8 mW cm(-2) and a maximum current density of 6 mA cm(-2), which are far higher than the values for systems based on immobilized enzymes. Enzymatic fuel cells containing a 15% (wt/v) maltodextrin solution have an energy-storage density of 596 Ah kg(-1), which is one order of magnitude higher than that of lithium-ion batteries. Sugar-powered biobatteries could serve as next-generation green power sources, particularly for portable electronics.
高能量密度、绿色环保且安全的电池对于满足便携式电子设备的快速发展需求至关重要。在酶燃料电池中，受一种或几种酶介导的糖不完全氧化会导致能量密度低和反应速率慢。在这里，我们展示了通过包含 13 种酶的合成分解代谢途径，麦芽糊精中的每个葡萄糖单元可产生近 24 个电子。这种酶燃料电池基于非固定化酶，其最大功率输出为 0.8 mW cm(-2)，最大电流密度为 6 mA cm(-2)，远高于基于固定化酶的系统的值。含有 15%（wt/v）麦芽糊精溶液的酶燃料电池的储能密度为 596 Ah kg(-1)，比锂离子电池高一个数量级。糖动力生物电池可以作为下一代绿色电源，特别是对于便携式电子设备而言。
