In order to improve the photocatalytic response of TiO_(2)to UV and visible light for hydrogen photoproduction,low cost M/TiO_(2)semiconductor catalysts were prepared by the impregnation method of five different first...In order to improve the photocatalytic response of TiO_(2)to UV and visible light for hydrogen photoproduction,low cost M/TiO_(2)semiconductor catalysts were prepared by the impregnation method of five different first row transition metals(M=Fe,Co,Ni,Cu or Zn)on a commercial titania support.The maximum hydrogen production efficiency was achieved for the Cu/TiO_(2)photocatalyst,with∼5000 and∼220µmol h^(−1)g^(−1)H_(2)production rates for UV and visible irradiation,respectively.Ni/TiO_(2)and Co/TiO_(2)also showed a significant photocatalytic activity when UV light was used.The best performing catalyst,Cu/TiO_(2),was characterized by TEM and XPS measurements.The data showed that Cu was highly dispersed over the TiO_(2)support and the copper species existed as both reduced Cu^(0)/Cu^(+)and oxidized Cu2+on TiO_(2).Besides,during the hydrogen production reaction,the reduced Cu was partially oxidized to Cu^(2+)by the transfer of photogenerated holes under UV or visible light irradiation.With UV and visible lamps,the H_(2)production rates were higher than those obtained with non-impregnated TiO_(2)by factors of 16 and 3,respectively.These results demonstrated that a Cu/TiO_(2)photocatalyst could be considered a promising low-cost alternative to the well-known Pt/TiO_(2)system for hydrogen production,making the Cu-based catalyst an ideal cost-effective candidate for this reaction.展开更多
基金Ministerio de Economía y Competitividad of Spain(CTQ2015-68951-C3-3-R and MAT2016-80933-R)Ministerio de Ciencia,Innovación y Universidades of Spain(Project RTI2018-099668-B-C22)and FEDER funds.
文摘In order to improve the photocatalytic response of TiO_(2)to UV and visible light for hydrogen photoproduction,low cost M/TiO_(2)semiconductor catalysts were prepared by the impregnation method of five different first row transition metals(M=Fe,Co,Ni,Cu or Zn)on a commercial titania support.The maximum hydrogen production efficiency was achieved for the Cu/TiO_(2)photocatalyst,with∼5000 and∼220µmol h^(−1)g^(−1)H_(2)production rates for UV and visible irradiation,respectively.Ni/TiO_(2)and Co/TiO_(2)also showed a significant photocatalytic activity when UV light was used.The best performing catalyst,Cu/TiO_(2),was characterized by TEM and XPS measurements.The data showed that Cu was highly dispersed over the TiO_(2)support and the copper species existed as both reduced Cu^(0)/Cu^(+)and oxidized Cu2+on TiO_(2).Besides,during the hydrogen production reaction,the reduced Cu was partially oxidized to Cu^(2+)by the transfer of photogenerated holes under UV or visible light irradiation.With UV and visible lamps,the H_(2)production rates were higher than those obtained with non-impregnated TiO_(2)by factors of 16 and 3,respectively.These results demonstrated that a Cu/TiO_(2)photocatalyst could be considered a promising low-cost alternative to the well-known Pt/TiO_(2)system for hydrogen production,making the Cu-based catalyst an ideal cost-effective candidate for this reaction.
