發(fā)布時(shí)間：2018-03-26 02:09

  本文選題：水氧化　切入點(diǎn)：可見光分解水　出處：《哈爾濱工業(yè)大學(xué)》2015年碩士論文

【摘要】：人工模擬光合作用制備氫氣,將太陽(yáng)能直接轉(zhuǎn)換為化學(xué)能,是解決21世紀(jì)能源短缺和環(huán)境污染問題的有效途徑之一。實(shí)現(xiàn)這一目的的可行方法是構(gòu)建可見光致水分解器件,在電極兩側(cè)分別完成水氧化和質(zhì)子還原兩個(gè)半反應(yīng)。其中,水氧化過程極其復(fù)雜,成為制約光解水實(shí)現(xiàn)的瓶頸因素。突破這一障礙的關(guān)鍵在于開發(fā)高效水氧化催化劑�；赗u、Ir等貴金屬元素的氧化物或配合物的水氧化催化劑雖然具有很高的催化活性,但高昂的成本制約其實(shí)際應(yīng)用。因此,研究基于廉價(jià)金屬的水氧化催化劑具有很重要的實(shí)際意義。本文采用磷酸基團(tuán)功能化的三聯(lián)吡啶釕作為光敏劑并用其敏化二氧化鈦光陽(yáng)極。合成了粒徑小于10nm的四氧化三鈷納米粒子作為催化劑,將其用柔性長(zhǎng)鏈修飾到染料敏化光陽(yáng)極表面,并進(jìn)一步構(gòu)建可見光分解水器件。光電性能測(cè)試表明,引入四氧化三鈷催化劑后,光電流密度由15μA/cm2增長(zhǎng)至140μA/cm2。本文還模擬植物光系統(tǒng)Ⅱ中Tyz-His190電子調(diào)節(jié)單元的結(jié)構(gòu),合成了仿生的電子調(diào)節(jié)劑,將其引入到光陽(yáng)極表面。用此復(fù)合光陽(yáng)極構(gòu)建的器件光電流密度有了進(jìn)一步增長(zhǎng),且電流衰減速度明顯減慢,光照90s后光電流仍能保持穩(wěn)定不變。
[Abstract]:Artificial simulation of photosynthesis to produce hydrogen and convert solar energy directly into chemical energy is one of the effective ways to solve the problems of energy shortage and environmental pollution in the 21st century. Water oxidation and proton reduction are performed on both sides of the electrode, respectively, in which the water oxidation process is extremely complex. The key to breaking this obstacle lies in the development of high efficient water oxidation catalysts. Although the catalysts based on oxides or complexes of precious metal elements such as Rui ir have high catalytic activity, But the high cost limits its practical application. It is of great practical significance to study the water oxidation catalyst based on cheap metal. In this paper, using tripyridine ruthenium with phosphoric acid group as Guang Min and sensitizing titanium dioxide photoanode, the particle size of TIO _ 2 is less than 10nm. Cobalt trioxide nanoparticles as catalysts, It was modified with flexible long chain to the surface of dye sensitized photoanode, and the visible light decomposing water device was further constructed. The photoelectric performance test showed that the cobalt tetroxide catalyst was introduced. The photocurrent density increased from 15 渭 A/cm2 to 140 渭 A / cm ~ (2). The structure of Tyz-His190 electronic regulator in plant light system 鈪，

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