Faculty of Electrical Engineering, University of Ljubljana, SI-1000 Ljubljana, Slovenia.
Nanoscale. 2015 Jun 21;7(23):10438-48. doi: 10.1039/c5nr02533h.
Novel mesoporous TiO2@DNA nanohybrid electrodes, combining covalently encoded DNA with mesoporous TiO2 microbeads using dopamine as a linker, were prepared and characterised for application in supercapacitors. Detailed information about donor density, charge transfer resistance and chemical capacitance, which have an important role in the performance of an electrochemical device, were studied by electrochemical methods. The results indicated the improvement of electrochemical performance of the TiO2 nanohybrid electrode by DNA surface functionalisation. A supercapacitor was constructed from TiO2@DNA nanohybrids with PBS as the electrolyte. From the supercapacitor experiment, it was found that the addition of DNA played an important role in improving the specific capacitance (Cs) of the TiO2 supercapacitor. The highest Cs value of 8 F g(-1) was observed for TiO2@DNA nanohybrids. The nanohybrid electrodes were shown to be stable over long-term cycling, retaining 95% of their initial specific capacitance after 1500 cycles.
新型介孔 TiO2@DNA 纳米杂化电极，通过多巴胺作为连接物，将共价编码 DNA 与介孔 TiO2 微珠结合，用于超级电容器的应用。通过电化学方法研究了对电化学器件性能有重要影响的供体密度、电荷转移电阻和化学电容的详细信息。结果表明，DNA 表面功能化提高了 TiO2 纳米杂化电极的电化学性能。TiO2@DNA 纳米杂化物在 PBS 作为电解质的情况下构建了超级电容器。从超级电容器实验中发现，DNA 的添加在提高 TiO2 超级电容器的比电容 (Cs) 方面起着重要作用。TiO2@DNA 纳米杂化物的最高 Cs 值为 8 F g(-1)。纳米杂化物电极在长期循环中表现出稳定性，在 1500 次循环后保留了初始比电容的 95%。
