Mesoporous Monoclinic CaIn2S4 with Surface Nanostructure: An Efficient Photocatalyst for Hydrogen Production under Visible Light

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• 作者：Jianjun Ding ; Bin Hong ; Zhenlin Luo ; Song Sun ; Jun Bao ; Chen Gao
• 刊名：Journal of Physical Chemistry C
• 出版年：2014
• 出版时间：December 4, 2014
• 年：2014
• 卷：118
• 期：48
• 页码：27690-27697
• 全文大小：432K
• ISSN：1932-7455

文摘

A novel ternary sulfide photocatalyst of monoclinic CaIn₂S₄ with excellent photocatalytic H₂ evolution activity is synthesized via a high-temperature sulfurization approach. The precursor orthorhombic CaIn₂O₄ can be converted in situ to monoclinic CaIn₂S₄ by using H₂S gas as the sulfurization reagent once the sulfurization temperature exceeds 773 K. The obtained yellow powders have a mesoporous structure and a chain-shape morphology with large surface area and high pore volume. SEM and TEM observations indicate that specific nanostep structures are formed on the surface of monoclinic CaIn₂S₄. Under visible light irradiation, monoclinic CaIn₂S₄ exhibits considerable performance for photocatalytic hydrogen production. A high H₂ evolution rate of 30.2 渭mol/h with good stability is achieved from Na₂S/Na₂SO₃ aqueous solution with the deposition of 0.5 wt % Pt nanoparticles, 30 times higher than that of cubic CaIn₂S₄, which makes it a new promising candidate photocatalyst for hydrogen production. This work can provide an effective approach to the fabrication of other mesoporous sulfide photocatalysts with high performance.