Shift of active sites via in-situ photodeposition of chromate achieving highly selective photocatalytic conversion of CO2 by H2O over ZnTa2O6
Shift of active sites via in-situ photodeposition of chromate achieving highly selective photocatalytic conversion of CO2 by H2O over ZnTa2O6
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DOI：
10.1016/j.apcatb.2021.120508
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发表时间：
2021-12
影响因子：
22.1
通讯作者：
Xuanwen Xu;K. Teramura;Hiroyuki Asakura;S. Hosokawa;Tsunehiro Tanaka
中科院分区：
文献类型：
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作者：
Xuanwen Xu;K. Teramura;Hiroyuki Asakura;S. Hosokawa;Tsunehiro Tanaka
原位光沉积的微量铬酸盐被发现有效地实现高选择性对CO的演变超过ZnTa2O6的光催化转化CO2由H2O。光沉积的Cr（OH）3在6.3 μmol h− 1下产生CO，选择性为80%，而裸ZnTa2O6在H2产生中显示出主要活性（22.0 μmol h−1H2vs. 1.2μmol h−1CO）与0.1 g光催化剂。ZnTa2O6，通过固相反应法合成，包含两种类型的表面与化学计量和Zn过量的Zn：Ta的比例，分别。化学计量表面负责整体水裂解。通过在反应过程中原位光沉积微量铬酸盐，发现合成的ZnTa2O6的活性中心从化学计量的表面转移到Zn过量的表面，并且Cr（OH）3修饰的Zn过量的表面被发现以CO为主要产物。
In-situ photodeposition of trace amounts of chromates was found effective in achieving high selectivity toward CO evolution over ZnTa2O6for the photocatalytic conversion of CO2by H2O. Photodeposited Cr(OH)3produced CO at 6.3 μmol h−1with a selectivity of 80 %, while bare ZnTa2O6shows a predominant activity in H2production (22.0 μmol h−1H2vs. 1.2 μmol h−1CO) with 0.1 g photocatalyst. ZnTa2O6, synthesized via a solid-state reaction method, contained two types of surfaces with stoichiometric and Zn-excessive Zn:Ta ratios, respectively. The stoichiometric surfaces were responsible for overall water splitting. By in-situ photodeposition of trace chromates during the reaction, the active sites of the synthesized ZnTa2O6shifted from the stoichiometric to the Zn-excessive surfaces and Cr(OH)3-modified Zn-excessive surfaces were found to evolve CO as the main product.