Bauer, D;
Roberts, AJ;
Patnaik, SG;
Brett, DJL;
Shearing, PR;
Kendrick, E;
Matsumi, N;
(2018)
High power sodium-ion batteries and hybrid electrochemical capacitors using Mo or Nb-doped nano-titania anodes.
Journal of the Electrochemical Society
, 165
(9)
A1662-A1670.
10.1149/2.0341809jes.
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Abstract
Nano-sized anatase (TiO2) and doped anatase (Mo0.1Ti0.9O2and Nb0.25Ti0.75O2) materials (ca. 5 nm) were synthesized using continuous hydrothermal flow synthesis and evaluated as negative electrodes in Na-ion batteries and hybrid capacitors. Na-ion half-cells (vs. Na metal counter electrodes) for the Mo-doped titania (Mo0.1Ti0.9O2) and Nb-doped titania (Nb0.25Ti0.75O2) electrodes both showed significantly higher specific discharge capacities than undoped anatase (ca. 75 mAh g−1compared to only 30 mAh g−1for undoped TiO2at 1 A g−1). This improved performance was attributed to higher pseudocapacitive contributions to charge storage, as well as improved sodium ion diffusion and lower charge transfer resistance. Na-ion hybrid electrochemical capacitors (Na-HECs) were made from the electrodes with activated carbon positive electrodes. As expected, Na-HECs using doped titania showed superior performance to the undoped anatase, with power densities up to 10.5 kW kg−1or energy densities of over 60 Wh kg−1(based on the weight of active material in both anode and cathode). The Mo0.1Ti0.9O2/AC Na-ion hybrid capacitor also showed excellent specific capacitance retention of ca. 75% over 3000 cycles at 5 mA cm−2(1 A g−1).
| Type: | Article |
|---|---|
| Title: | High power sodium-ion batteries and hybrid electrochemical capacitors using Mo or Nb-doped nano-titania anodes |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1149/2.0341809jes |
| Publisher version: | http://doi.org/10.1149/2.0341809jes |
| Language: | English |
| Additional information: | Copyright © The Author(s) 2018. Published by ECS. This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY, http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited. [DOI: 10.1149/2.0341809jes] |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10052938 |
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