Eosin Y/Pt/SiO_2催化剂光催化还原水制氢

Photocatalytic Reduction of Water to Hydrogen over Eosin Y/Pt/SiO_2 Catalysts

构建了具有较高可见光还原水制氢性能的Eosin Y/Pt/SiO2催化体系,详细考察了二氧化硅性质、曙红Y与二氧化硅的混合方式以及光照强度等因素对光敏化催化剂制氢性能的影响.实验结果表明:二氧化硅的比表面积增大,析氢速率随之提高;光照强度过高或过低都不利于提高光量子效率;与曙红Y浸渍法吸附在二氧化硅表面制备的催化剂相比,原位物理混合制备的催化剂光敏化析氢速率和稳定性均有显著提高.

A novel efficient photoscatalytic system Eosin Y/Pt/SiO2 for photocatalytic reduction of water to hydrogen under visible light irradiation was constructed. The effects of parameters, such as the surface physical property of SiO2 （i.e., specific surface area）, method of mixing Eosin Y and SiO2, and light intensity on catalyst properties for hydrogen evolution were investigated systemically. With increase of SiO2 specific surface area, the rate of hydrogen evolution increased. Either over high or low intensive irradiation is detrimental to obtain high quantum efficiency for hydrogen evolution. Compared to the Eosin Y adsorbed on SiO2 by an impregnation method, the composite system in which Eosin Y mixed with SiO2 physically in situ displayed higher rate and superior stability of hydrogen evolution.