Gallium Oxide Assisting Ag-Loaded Calcium Titanate Photocatalyst for Carbon Dioxide Reduction with Water,ACS Catalysis

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Gallium Oxide Assisting Ag-Loaded Calcium Titanate Photocatalyst for Carbon Dioxide Reduction with Water
ACS Catalysis ( IF 11.3 ) Pub Date : 2023-02-27 , DOI: 10.1021/acscatal.2c06038
Hongxuan Qiu ₁ , Akira Yamamoto _{1,

2} , Hisao Yoshida _{1,

2}

Affiliation

An efficient and highly selective photocatalytic conversion of carbon dioxide (CO₂) into valuable chemicals such as carbon monoxide (CO) using water (H₂O) as an electron donor has been much attractive and deeply desired, which requires the development of advanced photocatalysts based on a functional design. As the Ag-loaded calcium titanate (CaTiO₃, CTO) photocatalyst showed a high selectivity to CO₂ reduction in aqueous solution and the Ag-loaded gallium oxide (Ga₂O₃) photocatalyst showed a higher activity for both H₂O splitting and CO₂ reduction, herein, a series of composite photocatalyst samples consisting of Ga₂O₃ and CTO were simply fabricated by calcination of the physical mixtures, followed by loading of a Ag cocatalyst with a photodeposition method. The optimized sample with the Ag cocatalyst exhibited both a high CO formation rate of 56.9 μmol h^–1 (higher than that of Ag/Ga₂O₃) and a high selectivity of 95.0% (comparable to Ag/CTO) in the photocatalytic CO₂ reduction with H₂O. In this composite photocatalyst, most of the electrons generated in the photoexcited Ga₂O₃ part migrated to the minor CTO particles to contribute to the selective CO₂ reduction reaction, which was evidenced by the selective photodeposition of Ag species on the CTO part. The selective CO formation originates from the property of Ag-loaded CTO photocatalyst as the active part in the composite photocatalyst. The Ga₂O₃ part functions as an antenna to receive the light and donate the photoexcited electrons to the much decorated Ag/CTO part, where the concentrated electrons would promote CO₂ reduction with high efficiency.

中文翻译：

氧化镓辅助载银钛酸钙光催化剂用水还原二氧化碳

_{使用水 (H 2} O) 作为电子供体将二氧化碳 (CO ₂ )高效且高选择性地光催化转化为有价值的化学物质，例如一氧化碳 (CO)一直非常有吸引力和迫切需要，这需要开发高级光催化剂基于功能设计。由于负载 Ag 的钛酸钙 (CaTiO ₃ , CTO) 光催化剂对水溶液中的CO ₂还原表现出高选择性，而负载 Ag 的氧化镓 (Ga ₂ O ₃ ) 光催化剂对 H ₂ O 分解和CO ₂还原，在此，一系列由Ga _{2组成的复合光催化剂样品}O ₃和CTO 是通过物理混合物的煅烧，然后用光沉积法负载Ag 助催化剂来简单制造的。具有 Ag 助催化剂的优化样品在光催化 CO 中表现出 56.9 μmol h ^–1的高 CO 形成率（高于 Ag/Ga ₂ O _{3 ）和 95.0% 的高选择性（与 Ag/CTO 相当）}₂用 H _{2 O 还原。在这种复合光催化剂中，在光激发的 Ga}₂ O ₃部分中产生的大部分电子迁移到次要的 CTO 颗粒，从而有助于选择性 CO ₂还原反应，这通过 CTO 部分上 Ag 物质的选择性光沉积得到证明。选择性 CO 形成源于载银 CTO 光催化剂作为复合光催化剂中活性部分的特性。Ga ₂ O ₃部分用作接收光的天线，并将光生电子提供给装饰精美的 Ag/CTO 部分，其中集中的电子将高效促进 CO _2还原。

更新日期：2023-02-27

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