Photodeposition as a facile route to tunable Pt photocatalysts for hydrogen production: on the role of methanol
Photodeposition as a facile route to tunable Pt photocatalysts for hydrogen production: on the role of methanol
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DOI：
10.1039/c5cy01364j
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发表时间：
2016-01-01
影响因子：
5
通讯作者：
Lee, Adam F.
中科院分区：
文献类型：
--
作者：
Jiang, Zhi;Zhang, ZheYu;Lee, Adam F.
在甲醇存在下，H2 PtCl 6的光沉积促进在二氧化钛上形成高度分散的金属Pt纳米颗粒，这可能是通过醇捕获光生空穴产生过量的表面电子以用于基底介导的转移到Pt复合物，从而导致高密度的表面成核位点用于Pt还原。从水中光催化制氢与Pt金属助催化剂的表面密度成比例，因此在高甲醇浓度存在下的光沉积提供了优化光催化剂设计的简便途径，并突出了在光催化剂中调节助催化剂性质的重要性。
Photodeposition of H2PtCl6 in the presence of methanol promotes the formation of highly dispersed, metallic Pt nanoparticles over titania, likely via capture of photogenerated holes by the alcohol to produce an excess of surface electrons for substrate-mediated transfer to Pt complexes, resulting in a high density of surface nucleation sites for Pt reduction. Photocatalytic hydrogen production from water is proportional to the surface density of Pt metal co-catalyst, and hence photodeposition in the presence of high methanol concentrations affords a facile route to optimising photocatalyst design and highlights the importance of tuning co-catalyst properties in photocatalysis.