論文雑誌「Chemical Science」のカバーピクチャーを制作しました［京都大学］
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イギリスの王立化学会発行の学術雑誌 Chemical Science 2022年3月号に選ばれました。
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京都大学
大学院工学研究科
小川幹太様
大学院工学研究科
小川幹太様
Journal
Chemical Science
21 March 2022, Issue 11 Link
21 March 2022, Issue 11 Link
Manipulation of charge carrier flow in Bi4NbO8Cl nanoplate photocatalyst with metal loading
Kanta Ogawa, Ryota Sakamoto, Chengchao Zhong, Hajime Suzuki, Kosaku Kato, Osamu Tomita, Kouichi Nakashima, Akira Yamakata, Takashi Tachikawa, Akinori Saeki, Hiroshi Kageyama and Ryu Abe
Separation of photoexcited charge carriers in semiconductors is important for efficient solar energy conversion and yet the control strategies and underlying mechanisms are not fully established. Although layered compounds have been widely studied as photocatalysts, spatial separation between oxidation and reduction reaction sites is a challenging issue due to the parallel flow of photoexcited carriers along the layers. Here we demonstrate orthogonal carrier flow in layered Bi4NbO8Cl by depositing a Rh cocatalyst at the edges of nanoplates, resulting in spatial charge separation and significant enhancement of the photocatalytic activity. Combined experimental and theoretical studies revealed that lighter photogenerated electrons, due to a greater in-plane dispersion of the conduction band (vs. valence band), can travel along the plane and are readily trapped by the cocatalyst, whereas the remaining holes hop perpendicular to the plane because of the anisotropic crystal geometry. Our results propose manipulating carrier flow via cocatalyst deposition to achieve desirable carrier dynamics for photocatalytic reactions in layered compounds.
Link
Kanta Ogawa, Ryota Sakamoto, Chengchao Zhong, Hajime Suzuki, Kosaku Kato, Osamu Tomita, Kouichi Nakashima, Akira Yamakata, Takashi Tachikawa, Akinori Saeki, Hiroshi Kageyama and Ryu Abe
Separation of photoexcited charge carriers in semiconductors is important for efficient solar energy conversion and yet the control strategies and underlying mechanisms are not fully established. Although layered compounds have been widely studied as photocatalysts, spatial separation between oxidation and reduction reaction sites is a challenging issue due to the parallel flow of photoexcited carriers along the layers. Here we demonstrate orthogonal carrier flow in layered Bi4NbO8Cl by depositing a Rh cocatalyst at the edges of nanoplates, resulting in spatial charge separation and significant enhancement of the photocatalytic activity. Combined experimental and theoretical studies revealed that lighter photogenerated electrons, due to a greater in-plane dispersion of the conduction band (vs. valence band), can travel along the plane and are readily trapped by the cocatalyst, whereas the remaining holes hop perpendicular to the plane because of the anisotropic crystal geometry. Our results propose manipulating carrier flow via cocatalyst deposition to achieve desirable carrier dynamics for photocatalytic reactions in layered compounds.
Link
