Kizling Michał, Dzwonek Maciej, Więckowska Agnieszka, Stolarczyk Krzysztof, Bilewicz Renata
Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
Faculty of Chemistry, University of Warsaw, Pasteura 1, 02-093 Warsaw, Poland.
Biosens Bioelectron. 2021 Aug 15;186:113248. doi: 10.1016/j.bios.2021.113248. Epub 2021 Apr 21.
In this report, we demonstrate the advantages of the dual-mode operation of an enzymatic biosupercapacitor with nanostructured polypyrrole/nanocellulose, gold nanoparticle-based paper electrodes, sucrose as the anode fuel and molecular oxygen as the oxidant. The device allowed conversion of the sucrose biofuel, and offered storage of the generated power in the same, small-scale device. The external and internal biosupercapacitor re-charging modes were compared. The specific capacitance of the device was 1.8 F cm at a discharge current density of 1 mA cm. The cell used in the charge/discharge mode of operation allowed retention of 49% of the initial capacitance after eight days of exhaustive discharging under external load. The discontinuous capacitive mode, preserved the biocatalysts activity for much longer time. The use of such enzyme-based electrical energy sources in the capacitive mode i.e. under discontinuous charging was demonstrated as a solution for preserving high specific capacitance and long-term operational stability.
在本报告中，我们展示了一种酶促生物超级电容器双模式运行的优势，该电容器采用纳米结构的聚吡咯/纳米纤维素、基于金纳米颗粒的纸质电极、蔗糖作为阳极燃料以及分子氧作为氧化剂。该装置能够实现蔗糖生物燃料的转化，并在同一小型装置中存储所产生的电能。我们比较了外部和内部生物超级电容器的充电模式。在放电电流密度为1 mA/cm²时，该装置的比电容为1.8 F/cm²。在充电/放电模式下运行的电池，在外部负载下经过八天的彻底放电后，仍能保持初始电容的49%。间断电容模式能使生物催化剂的活性保持更长时间。在电容模式下，即在间断充电的情况下使用这种基于酶的电能来源，被证明是保持高比电容和长期运行稳定性的一种解决方案。
