Structure and Photocatalytic Activity of PdCrOx Cocatalyst on SrTiO3 for Overall Water Splitting
Structure and Photocatalytic Activity of PdCrOx Cocatalyst on SrTiO3 for Overall Water Splitting
复制标题
DOI：
10.3390/catal9010059
复制
发表时间：
2019-01-01
期刊：
影响因子：
3.9
通讯作者：
Maeda, Kazuhiko
中科院分区：
文献类型：
--
作者：
Kanazawa, Tomoki;Nozawa, Shunsuke;Maeda, Kazuhiko
采用透射电镜、x射线吸收精细结构能谱和x射线光电子能谱研究了SrTiO3上PdCrOx多组分共催化剂的形成机理。PdCrOx/SrTiO3样品在紫外光照射（λ > 300 nm）不同时间（0-5 h）下通过光沉积法合成。随着辐照时间的增加，PdCrOx纳米粒子的微观结构和价态由氧化态钯转变为金属态钯和氧化态钯的混合物。在沉积过程中，PdCrOx的总水分解活性与光照射时间密切相关。制备过程中较长的光照射时间虽然不影响PdCrOx/SrTiO3在甲醇水溶液中的H-2析出活性，但能有效抑制O-2光还原活性，这是整个水裂解过程中的逆向反应之一。
The mechanism of PdCrOx multi-component cocatalyst formation on SrTiO3 was investigated using transmission electron microscopy, X-ray absorption fine structure spectroscopy and X-ray photoelectron spectroscopy. The PdCrOx/SrTiO3 samples were synthesized by a photodeposition method under UV light irradiation (lambda > 300 nm) for various time periods (0-5 h). The fine structure and valence state of the Pd species of PdCrOx nanoparticles were varied from Pd oxide to a mixture of metallic Pd and oxidized Pd species with an increase in the irradiation time. The overall water-splitting activity of PdCrOx was strongly dependent on the photoirradiation time during deposition. Although longer photoirradiation time during preparation did not influence the H-2 evolution activity of PdCrOx/SrTiO3 from aqueous methanol solution, it was effective in suppressing the O-2 photoreduction activity, which is one of the backward reactions during overall water splitting.