利用光能進行高效率水分解製氫的關鍵在於光觸媒的研發。光觸媒的研發，包括尋找新觸媒及改良原有的觸媒。後者可以藉由減小粒徑、增加觸媒表面積、負載其它金屬或金屬氧化物及與異元素摻混將表面化學結構改質來增加光觸媒的反應活性。

　　本研究是針對以激發銀-鉭系波洛斯凱特型光觸媒在紫外光照射下催化水分解反應，進行初步的研究。觸媒是採用固態法與溶膠凝膠法兩種方法來製備，另外再對觸媒摻入不同劑量的鑭與含浸不同比例的氧化鎳進行化學改質。分別探討觸媒對水分解產生氫氣的活性影響。觸媒以X-光繞射分析、掃瞄式電子顯微鏡和紫外光可見光光譜儀作物化特性之鑑定。

　　根據X-光繞射分析顯示，以固態法與溶膠凝膠法製備的觸媒均具有良好的晶相。觀察SEM圖，可看出使用溶膠凝膠法製備的觸媒顆粒較固態法製備的小且均勻。由UV-Vis吸收光譜可看出，銀-鉭系波洛斯凱特型觸媒會吸收紫外光。

　　以製得的觸媒進行光催化水分解反應，發現以溶膠凝膠法製備的觸媒較固態法製備的活性高。以等比例的銀-鉭為起始原料、檸檬酸為分散劑，使用溶膠凝膠法並煅燒到850℃所製得的AgTaO3觸媒(SG-CA-850)活性最好，產生氫氣的速率為4.47 μmol／hr‧gcat。若在其上負載1 wt%NiO，可進一步提升其活性，氫氣的生成速率可達9.31 μmol／hr‧gcat。

　　To efficiently split water for hydrogen generation relies heavily on the development and design of light-driven photocatalysts including finding new catalysts and improve the old catalysts. The latter can be improved by decreasing the particle size, increasing the surface area , loading metal oxide and doping heteroatom. Suitable modification of the surface sites might increase the photocatalytic activity of the catalyst.

In this study, AgTaO3 catalysts were prepared by solid-state reaction method and sol-gel method and were further modified through loading NiO and doping La. The performances of the prepared catalysts for water splitting under UV light irradiation were investigated. The effects of different preparation parameters on the photocatalytic activities of the catalysts were also studied. The catalysts were characterized by using powder X-ray diffractometer (XRD), scanning electron spectroscope (SEM), ultravillet-visible spectrophotometer (UV-Vis). The photocatalytic reaction was carried out in a Pyrex reactor with 400 W high pressure mercury lamp as UV light source.

　　All of the AgTaO3 absorb UV light catalysts prepared by solid-state reaction and sol-gel methods were fully crystallized to form Perovskite-type phases after being calcinated at a temperature about 850℃. SEM shows that the particles sizes of catalysts prepared by the sol-gel method are far smaller than those prepared by the solid-state reaction method.

For water splitting, AgTa O3 catalysts prepared by sol-gel method showed higher activities than those prepared by solid-state reaction method. AgTaO3 catalysts prepared by sol-gel method and calcined to 850℃ had the highest activity( Average rate of hydrogen generation = 4.47 μmol/hr‧gcat.). When this catalyst was further loaded with NiO, a loading of 1 wt % would give the best performance ( Rate of H2 evolution = 9.31 μmol/hr‧gcat. ).

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