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세슘이 담지된 반도체 광촉매에서 물의 광분해 반응에 의한 수소의 생성
정경환,장덕례,박대철 ( Kyeong Hwan Chung,Duck Rye Chang,Dae Chul Park ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.5
Hydrogen evolution from photocatalytic decomposition of water was studied on cesium loaded metal oxide and alkali treated metal compound photocatalysts. The effect of alcohol in photocatalytic decomposition of water was investigated and the path of photoreaction was schemingly explained. The rate of hydrogen evolution was not very high in case of cesium loaded metal oxide photocatalvsts. In case of cesium loaded metal compound photocatalysts (treating with alkali metal), it was more increased then the case of cesium loaded metal oxide. It was considered that cesium loaded metal compound photocatalysts were given the enhancement of photoresponsibility. The photocatalytic activity of nickel-metal compound photocatalyst was highly improved by reduction-oxidation pretreatment, but that of cesium case was independent on the pretreatment. The reason is surmised that cesium has a strong oxidation ability into superoxide even in air. In the photocatalytic decomposition of alcohol-water mixture, the rate of hydrngen evolution was abruptly increased. Peculiarly, oxygen product was not detected, because the oxidation reaction of alcohol occurred simultaneously during the photoreaction.