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Band edge engineering of TiO2@DNA nanohybrids and implications for capacitive energy storage devices.
Univ Ljubljana, Fac Elect Engn, SI-1000 Ljubljana, Slovenia; [ 2 ] Univ Ljubljana, Fac Hlth Sci, SI-1000 Ljubljana, Slovenia .
Uppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Biosensors and Bioelectronics. Linköping University, The Institute of Technology. UCS, Tekidag AB, S-58330 Linkoping, Sweden. (Biosensors & Bioelectronics)
Uppsala Univ, Angstrom Lab, Dept Chem, S-75120 Uppsala, Sweden.
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2015 (English)In: Nanoscale, ISSN 2040-3364, E-ISSN 2040-3372, Vol. 7, no 23, 10438-10448 p.Article in journal (Refereed) Published
Abstract [en]

 Novel mesoporous TiO2@DNA nanohybrid electrodes, combining covalently encoded DNA with mesoporous TiO2 microbeads using dopamine as linker, were prepared and characterised for application in supercapacitors. Detailed information about donor density, charge transfer resistance and chemical capacitance, which have important role in the performance of an electrochemical device, were studied by electrochemical methods. The results indicated the improvement of electrochemical performance of TiO2 nanohybrid electrode by DNA surface functionalisation. A supercapacitor was constructed from TiO2@DNA nanohybrids with PBS as 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 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.

Place, publisher, year, edition, pages
RSC Publishing, 2015. Vol. 7, no 23, 10438-10448 p.
Keyword [en]
Bio-inspired systems, energy density of states, DNA electronics, charge storage
National Category
Physical Chemistry
URN: urn:nbn:se:liu:diva-118088DOI: 10.1039/C5NR02533HISI: 000355987300017PubMedID: 26001096OAI: diva2:813046
Swedish Research Council, VR-2011-6058357

The authors would like to acknowledge the Swedish Research Council (VR-2011-6058357), R.I. and A.I., Slovenian Research Agency (ARRS, grants J3-6728, J1-4109, J1-4136, J3-4108 & P2-0232) for generous financial support to carry out this research.

Available from: 2015-05-21 Created: 2015-05-21 Last updated: 2015-07-06

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