Sulfurization-Assisted Cobalt Deposition on Sm2Ti2S2O5 Photocatalyst for Water Oxidation under Visible Light Irradiation

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• 作者：Rengui Li ; Zheng Chen ; Wen Zhao ; Fuxiang Zhang ; Kazuhiko Maeda ; Baokun Huang ; Shuai Shen ; Kazunari Domen ; Can Li
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 10, 2013
• 年：2013
• 卷：117
• 期：1
• 页码：376-382
• 全文大小：377K
• 年卷期：v.117,no.1(January 10, 2013)
• ISSN：1932-7455

文摘

Deposition of cocatalyst is an efficient way for photocatalytic water splitting to improve solar energy conversion efficiency, and its deposition method has been known to make a great effect. In this work, we introduced a sulfurization-assisted deposition method to load earth-abundant cobalt cocatalyst for the purpose of promoting water oxidation performance of Sm₂Ti₂S₂O₅ oxysulfide that is characterized with wide visible light absorption. The cobalt deposition introduced here undergoes first formation of CoS_x by sulfurization at high temperature and subsequent conversion into CoO_x by calcinations in air. Compared to conventionally impregnated cobalt or IrO₂ colloids, the sulfurization-assisted cobalt deposition well maintains structure of photocatalyst and inhibits the formation of defect sites leading to better separation of photogenerated carriers and water oxidation performance. The apparent quantum efficiency of the optimized sample reaches 5.0% at 420 nm. The sulfurization-assisted deposition actually open a new way to modify the (oxy)sulfide semiconductors.