[Co(bpy)3]3+/2+ and [Co(phen)3]3+/2+ Electron Mediators for Overall Water Splitting under Sunlight Irradiation Using Z-Scheme Photocatalyst System
[Co(bpy)3]3+/2+ and [Co(phen)3]3+/2+ Electron Mediators for Overall Water Splitting under Sunlight Irradiation Using Z-Scheme Photocatalyst System
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DOI：
10.1021/ja400238r
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发表时间：
2013-04-10
影响因子：
15
通讯作者：
Kudo, Akihiko
中科院分区：
文献类型：
--
作者：
Sasaki, Yasuyoshi;Kato, Hideki;Kudo, Akihiko
[Co(bpy)(3)](3+/2+) 和 [Co(phen)(3)](3+/2+) 氧化还原电对在由 Ru/SrTiO3:Rh 和 BiVO4 粉末组成的 Z 型光催化剂系统中充当电子介体，在可见光照射下实现整体水分解。这些电子介体仅对 SrTiO3:Rh 与 BiVO4 的组合有效。当使用未掺杂的 SrTiO3 和 TiO2 的 H-2 光催化剂以及 WO3 的 O-2 光催化剂时，它们不起作用。这些结果表明光催化剂和Co配合物电子介体之间的亲和力很重要。光催化活性取决于pH。中性 pH 条件下的总体水分解活性最高。目前系统的总体水分解在很长一段时间内稳定进行。 Z型光催化剂系统还被证实可以在阳光照射下分解水，分解速度取决于天气。此外，Z型光催化剂系统与Co络合物电子介体使用反应池进行整体水分解，其中通过膜过滤器将Ru/SrTiO3:Rh悬浮液与BiVO4悬浮液分开，导致H-2放出与O-2放出分离。
[Co(bpy)(3)](3+/2+) and [Co(phen)(3)](3+/2+) redox couples were revealed to play as electron mediators for Z-scheme photocatalyst systems composed of Ru/SrTiO3:Rh and BiVO4 powders for overall water splitting under visible light irradiation. These electron mediators were effective for only the combination of SrTiO3:Rh with BiVO4. They did not work when nondoped SrTiO3 and TiO2 of H-2-evolving photocatalysts and WO3 of O-2-evolving photocatalysts were employed. These results indicated that the affinity between photocatalysts and the Co-complex electron mediators was important. The photocatalytic activity depended on pH. Neutral pH conditions gave the highest activity for overall water splitting. Overall water splitting by the present system steadily proceeded for a long time. The Z-scheme photocatalyst system was also confirmed to split water under sunlight irradiation at the rates depending on weather. Moreover, overall water splitting by the Z-scheme photocatalyst system with the Co-complex electron mediator using a reaction cell in which the Ru/SrTiO3:Rh suspension was divided from BiVO4 suspension by a membrane filter resulted in H-2 evolution separated from that of O-2.