Potassium hexatitanate photocatalysts prepared by a flux method for water splitting
Potassium hexatitanate photocatalysts prepared by a flux method for water splitting
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DOI：
10.1016/j.cattod.2013.10.046
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发表时间：
2014-09
期刊：
影响因子：
5.3
通讯作者：
H. Yoshida;M. Takeuchi;Masumi Sato;Like Zhang;Tomoki Teshima;M. Chaskar
中科院分区：
文献类型：
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作者：
H. Yoshida;M. Takeuchi;Masumi Sato;Like Zhang;Tomoki Teshima;M. Chaskar
以K2CO3和TiO2为原料，采用不同溶质浓度和不同冷却速度的KCl助熔剂，采用助熔剂法制备了K2Ti6O13光催化剂。较低的溶质浓度和适度缓慢的冷却速度可以得到细小的六方棒状六钛酸钾晶体，这种晶体是通过溶质在足够数量的熔盐中溶解，然后在冷却步骤中结晶和生长六钛酸钾而形成的，推测缺陷形成较少。在本研究制备的光催化剂中，负载Rh助剂的六钛酸钾微晶连续表现出最好的光催化分解水的活性，包括用固相反应法制备的样品。
Potassium hexatitanate (K2Ti6O13) photocatalysts were prepared by a flux method from K2CO3and TiO2by using a KCl flux with various concentration of solute and various cooling rate of the molten mixture. A low concentration of the solute and a moderately slow cooling rate provided fine hexagonal rod-like crystals of potassium hexatitanate, which would be formed through dissolution of the solutes in enough amount of the molten salt followed by crystallization and growth of potassium hexatitanate during the cooling step, presumably with fewer defects formation. The fine crystals of potassium hexatitanate loaded with rhodium cocatalyst continuously exhibited the best photocatalytic activity for water splitting among the photocatalysts prepared in this study including a sample prepared by a solid state reaction method.