| Summary: | 碩士 === 國立東華大學 === 材料科學與工程學系 === 99 === Energy and environmental issues at a global level are important topics because of energy shortages in recent years. The splitting of water into hydrogen and oxygen has been studied extensively. Many studies have investigated the photocatalysis, and the most extensive photocatalyst is titanium oxide(TiO2), due to its photo-electrochemical stability, non-toxicity, and low cost for fabrication.
Graphene, consisting of a single atomic layer of graphite, has generated increasing interest because of its unique properties and potential applications, the graphite oxide(GO) is the intermediate state between graphene and graphite.
In the first part, we prepared graphite oxide with titanium oxide(TiO2), sodium tantalate(NaTaO3) and Potassium hexaniobate(K4Nb6O17) co-catalyst. We found that different catalyst could have vary optimal amount of graphite oxide for increased photocatalytic water-splitting hydrogen production. The increased hydrogen production by adding graphite oxide could reduce the electron-hole recombination. For hydrogen production, we found a important factor which was the contact of the surface between catalystic and graphite oxide.
In the second part, we adjusted suitable content of platinum for Pt/TiO2 and changed vary preparations for Pt/TiO2, such as microwave reduction, photodeposition, impregnation and chemical reduction. Changing the quantity of platinum and preparations enhanced hydrogen production, but may deactive very quickly. In our study, Pt/TiO2 prepared by chemical reduction has lower efficiently the hydrogen production than Pt/TiO2 prepared by photodeposition but also has less decay constant. The hydrogen production of Pt/TiO2 is higher between Pt/TiO2, Au/TiO2 and Cu/TiO2, but the hydrogen production of Cu/TiO2 is much stable.
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