Solar photochemical-thermal water splitting at 140 degrees C with Cu-loaded TiO2
Docao, S (Docao, Son)[ 1 ] ; Koirala, AR (Koirala, Agni Raj)[ 1 ]
; Kim, MG
(Kim, Min Gyu)[ 2 ]
; Hwang, IC (Hwang, In Chul)[ 1 ] ; Song, MK (Song, Mee Kyung)[ 1 ] ; Yoon, KB (Yoon, Kyung Byung)[ 1 ]
[ 1 ] Sogang Univ, Dept Chem, Korea Ctr Artificial Photosynth, Seoul 121742, South Korea
[ 2 ] Pohang Univ Sci & Technol, Pohang Accelerator Lab PAL, Pohang 790784, South Korea
Metal oxide based solar thermal water splitting is a promising approach for using solar energy to produce H-2 and O-2. The normal protocol employed for this process involves thermal reduction of a metal oxide (MOx) at around 1500 degrees C to produce the reduced form of the metal oxide (MOx -delta d) and O-2. This step is followed by steam treatment of MOx delta d at around 1000 degrees C to yield MOx and H-2. Owing to the need to use high temperatures, the traditional approach has several important drawbacks. In a study designed to improve this process, we found that Cu-loaded TiO2 (Cu/TiO2) effectively expels O-2 upon irradiation with AM 1.5 1 Sun solar simulated light and that treatment of the reduced form of the reduction product Cu/TiO2-delta with steam at 140 degrees C generates H-2. This new approach, termed as solar photochemical-thermal water splitting, has the potential to become an important method for converting solar energy into chemical energy.