Highly Active NaTaO3-Based Photocatalysts for CO2 Reduction to Form CO Using Water as the Electron Donor
Highly Active NaTaO3-Based Photocatalysts for CO2 Reduction to Form CO Using Water as the Electron Donor
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DOI：
10.1002/cssc.201601360
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发表时间：
2017-01-10
期刊：
影响因子：
8.4
通讯作者：
Kudo, Akihiko
中科院分区：
文献类型：
--
作者：
Nakanishi, Haruka;Iizuka, Kosuke;Kudo, Akihiko
掺杂NaTaO 3（NaTaO 3：A，其中A= Mg、Ca、Sr、Ba或La）已经作为高活性光催化剂出现，当与Ag助催化剂一起使用时，在UV照射下，在1 atm（0.1 MPa）的CO2下，使用水作为电子供体，用于CO2还原以同时形成CO、H-2和O-2。反应的电子/空穴的数目的比率几乎是1，表明水作为电子供体被消耗。液相还原法负载银助催化剂上级光沉积法和浸渍法。在不需要添加剂的情况下，负载Ag的NaTaO 3：Ba光催化剂在水中的活性最高。添加碳酸氢盐等碱可有效增强Mg、Ca、Sr、Ba和La掺杂的NaTaO 3光催化剂与Ag助催化剂的CO生成。Ca和Sr掺杂的NaTaO 3光催化剂在NaHCO 3水溶液中显示出特别高的活性，沿着有Ba掺杂的光催化剂。Ca、Sr和Ba掺杂的NaTaO 3光催化剂与Ag助催化剂的CO生成选择性[CO/（CO+H-2）]达到90%左右。
Doped NaTaO3 (NaTaO3 : A, where A= Mg, Ca, Sr, Ba, or La) has arisen as a highly active photocatalyst for CO2 reduction to simultaneously form CO, H-2, and O-2 using water as the electron donor when used with an Ag cocatalyst, under UV irradiation, and with 1 atm (0.1 MPa) of CO2. The ratio of the number of reacted electrons/holes was almost unity, indicating that water was consumed as the electron donor. A liquid-phase reduction method for loading of the Ag cocatalyst was superior to photodeposition and impregnation methods. The Ag cocatalystloaded NaTaO3: Ba was the most active photocatalyst in water with no required additives. The addition of bases, such as hydrogencarbonate, was effective to enhance the CO formation for Mg-, Ca-, Sr-, Ba-, and La-doped NaTaO3 photocatalysts with an Ag cocatalyst. Ca-and Sr-doped NaTaO3 photocatalysts showed especially high activity along with the Ba-doped photocatalyst in the aqueous NaHCO3 solution. The selectivity for the CO formation [CO/(CO+H-2)] on Ca-, Sr-, and Ba-doped NaTaO3 photocatalysts with Ag cocatalyst reached around 90%.