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TiO2/MnO2 composite electrode enabling photoelectric conversion and energy storage as photoelectrochemical capacitor 60423240 Usui, Hiroyuki Suzuki, Shin 50576717 Domi, Yasuhiro 00202086 Sakaguchi, Hiroki Copyright © 2018 Elsevier Ltd. All rights reserved. This manuscript version is made available under the CC-BY-NC-ND 4.0 license https://creativecommons.org/licenses/by-nc-nd/4.0/ Photoelectrochemical capacitor Composite electrode Rutile-type TiO2 γ-phase MnO2 Hydrothermal synthesis Photoelectrochemical capacitor Composite electrode Rutile-type TiO2 γ-phase MnO2 Hydrothermal synthesis We prepared composite electrodes by using rutile TiO2 particles and γ-MnO2 particles, and evaluated their photoelectrochemical capacitor properties based on Na+ adsorption by light irradiation in aqueous electrolytes. By employing different synthesis method for TiO2 particles, we synthesized TiO2 particles with various particle sizes and crystallite sizes. An electrode of sol-gel-synthesized TiO2 showed higher photovoltages compared with an electrode of commercial TiO2. This probably originates from a larger contact area between electrode surface and electrolyte because of its smaller particle size than commercial TiO2's size. A further enhancement in photovoltage was attained for an electrode of a hydrothermally-synthesized TiO2 with good crystallinity. We consider that electron-hole recombination was suppressed because hydrothermal TiO2 has a lower density of lattice defect trapping the photoexcited carriers. As photoelectrochemical capacitor, a composite electrode consisting of hydrothermal TiO2 and MnO2 exhibited a 2.4 times larger discharge capacity compared with that of commercial TiO2 and MnO2. This result is attributed to an increased amount of Na+ adsorption induced by the enhanced photovoltage of TiO2. Elsevier Ltd. 2018-05-30 eng journal article AM https://repository.lib.tottori-u.ac.jp/records/7298 10.1016/j.mtener.2018.05.013 This research was published by Elsevier.: USUI, Hiroyuki, et al. TiO2/MnO2 composite electrode enabling photoelectric conversion and energy storage as photoelectrochemical capacitor. Materials today energy, 2018, 9: 229-234. https://doi.org/10.1016/j.mten https://www.sciencedirect.com/science/article/pii/S2468606918300807 https://www.sciencedirect.com/science/article/pii/S2468606918300807 24686069 Materials Today Energy Materials Today Energy 9 229 234 https://repository.lib.tottori-u.ac.jp/record/7298/files/mte9_229.pdf application/pdf 682.1 kB 2020-05-29