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Photocatalytic Reduction of Carbon Dioxide over Ag Cocatalyst-Loaded ALa<sub>4</sub>Ti<sub>4</sub>O<sub>15</sub> (A = Ca, Sr, and Ba) Using Water as a Reducing Reagent

Kosuke IizukaDepartment of Applied Chemistry, Faculty of Science, and ‡Division of Photocatalyst for Energy and Environment, Research Institute of Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanTomoaki WatoDepartment of Applied Chemistry, Faculty of Science, and ‡Division of Photocatalyst for Energy and Environment, Research Institute of Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanYugo MisekiDepartment of Applied Chemistry, Faculty of Science, and ‡Division of Photocatalyst for Energy and Environment, Research Institute of Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanKenji SaitoDepartment of Applied Chemistry, Faculty of Science, and ‡Division of Photocatalyst for Energy and Environment, Research Institute of Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, JapanAkihiko KudoDepartment of Applied Chemistry, Faculty of Science, and ‡Division of Photocatalyst for Energy and Environment, Research Institute of Science and Technology, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan
2011en
ABI

Аннотация

Ag cocatalyst-loaded ALa(4)Ti(4)O(15) (A = Ca, Sr, and Ba) photocatalysts with 3.79-3.85 eV of band gaps and layered perovskite structures showed activities for CO(2) reduction to form CO and HCOOH by bubbling CO(2) gas into the aqueous suspension of the photocatalyst powder without any sacrificial reagents. Ag cocatalyst-loaded BaLa(4)Ti(4)O(15) was the most active photocatalyst. A liquid-phase chemical reduction method was better than impregnation and in situ photodeposition methods for the loading of the Ag cocatalyst. The Ag cocatalyst prepared by the liquid-phase chemical reduction method was loaded as fine particles with the size smaller than 10 nm on the edge of the BaLa(4)Ti(4)O(15) photocatalyst powder with a plate shape during the CO(2) reduction. CO was the main reduction product rather than H(2) even in an aqueous medium on the optimized Ag/BaLa(4)Ti(4)O(15) photocatalyst. Evolution of O(2) in a stoichiometric ratio (H(2)+CO:O(2) = 2:1 in a molar ratio) indicated that water was consumed as a reducing reagent (an electron donor) for the CO(2) reduction. Thus, an uphill reaction of CO(2) reduction accompanied with water oxidation was achieved using the Ag/BaLa(4)Ti(4)O(15) photocatalyst.

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DOI
10.1021/ja207586e

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Цитирований: 2Использованных источников: 0
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