Effect of Mo₂C content on the structure and photocatalytic property of Mo₂C/TiO₂ catalysts

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• 作者：Huiquan Li ; ^{huiquanli0908@163.com} ; Wenshan Hong ; Yumin Cui ; Suhua Fan ; Liangjun Zhu
• 关键词：Temperature-programmed reaction ; Mo2C/TiO2 ; Photocatalysis ; Hydrogen production
• 刊名：Journal of Alloys and Compounds
• 出版年：2013
• 出版时间：25 August, 2013
• 年：2013
• 卷：569
• 期：Complete
• 页码：45-51
• 全文大小：1759 K

文摘

Mo₂C loaded nano-anatase TiO₂ (Mo₂C/TiO₂) photocatalysts with various weight percents of Mo₂C were successfully prepared by temperature-programmed reaction and characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflection spectroscopy (UV-vis DRS), transmission electron microscopy (TEM), scanning electron microscopy (SEM), photoelectrochemical (PEC) and Brunauer-Emmett-Teller (BET) surface area measurements. Photocatalytic degradation of methyl orange (MO) and phenol as well as photocatalytic H₂ evolution over Mo₂C/TiO₂ samples was investigated under UV light irradiation. The results show that the Mo₂C/TiO₂ photocatalysts exhibit a coexistence of both hexagonal Mo₂C and anatase TiO₂ phases. The 0.54 % Mo₂C/TiO₂ catalyst not only exhibits higher photocatalytic activity but also presents higher resistance to sulfur poisoning as compared to either pure anatase TiO₂ or reference 0.54 % Pd/TiO₂ catalyst. The remarkably enhanced photocatalytic activity can be mainly attributed to the fact that the Mo₂C improves the multiple electron transference to O₂, which reduces the recombination of electron-hole pairs. The mechanism of photocatalytic activity enhancement was also investigated.