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Journal Articles

Intercalative and non-intercalative photo-recharge using all-solid-state cells for solar energy conversion and storage

Yoshimoto, Masataka*; Tamura, Kazuhisa; Watanabe, Kenta*; Shimizu, Keisuke*; Horisawa, Yuhei*; Kobayashi, Takeshi*; Tsurita, Hanae*; Suzuki, Kota*; Kanno, Ryoji*; Hirayama, Masaaki*

Sustainable Energy & Fuels (Internet), 8(6), p.1236 - 1244, 2024/03

https://doi.org/10.1039/D3SE01636F

Times Cited Count：0 Percentile：0.01(Chemistry, Physical)

Photo-rechargeable systems, which can efficiently convert and store solar energy into chemical energy within single devices, are essential to harness sunlight effectively. Photo-(de)intercalation plays a pivotal role in the functionality of photorechargeable systems. Nevertheless, the photo-(de)intercalation process has not been conclusively confirmed owing to potential interference from side reactions, such as the decomposition of liquid electrolytes and the elution of electrode materials. In this study, we successfully demonstrated photo-responsive Li $^{+}$ -deintercalation using an all-solid-state thin-film battery comprised of epitaxially-grown anatase TiO $_{2}$ doped with Nb (a-TiO $_{2}$ :Nb) as the cathode. Under light irradiation, Li $^{+}$ -deintercalation occurred and was subsequently reversibly intercalated into a-TiO $_{2}$ :Nb during discharge.

Journal Articles

Stable photoelectrochemical reactions at solid/solid interfaces toward solar energy conversion and storage

Watanabe, Kenta*; Horisawa, Yuhei*; Yoshimoto, Masataka*; Tamura, Kazuhisa; Suzuki, Kota*; Kanno, Ryoji*; Hirayama, Masaaki*

Nano Letters, 24(6), p.1916 - 1922, 2024/02

https://doi.org/10.1021/acs.nanolett.3c03982

Times Cited Count：2 Percentile：95.46(Chemistry, Multidisciplinary)

Electrochemistry has extended from reactions at solid/liquid interfaces to those at solid/solid interfaces. In this study, we achieve the stable photoelectrochemical reaction at the semiconductor-electrode/solid-electrolyte interface in Nb-doped anatase-TiO $_{2}$ (a-TiO $_{2}$ :Nb)/Li $_{3}$ PO $_{4}$ (LPO)/Li all-solid-state cell. The oxidative currents of a-TiO $_{2}$ :Nb/LPO/Li increase upon light irradiation when a-TiO $_{2}$ :Nb is located at a potential that is more positive than its flat-band potential. The photoelectrochemical reaction at the semiconductor/solid-electrolyte interface is driven by the same principle as that at semiconductor/liquid-electrolyte interfaces. Thus, we extend photoelectrochemistry to all-solid-state systems composed of solid/solid interfaces.