三維ATO反蛋白石復合結構的制備及光電化學性能研究
發(fā)布時間：2018-09-17 13:07
【摘要】：能源危機和環(huán)境污染已經成為制約經濟發(fā)展的兩大嚴峻問題。光電化學池利用太陽能將水分解制備氫氣是一種綠色環(huán)保的制氫方法。一些半導體材料,例如Ti O2、Fe_2O_3、Bi VO_4都已經被用作光陽極材料用于光解水制氫。但這些半導體材料存在載流子擴散距離短、導電性差、光吸收率不高等問題,降低了其光電轉化效率�；诖�,本文制備了Sb摻雜Sn O2的三維ATO反蛋白石結構,并將其作為導電骨架與Fe_2O_3、Ti O2半導體材料復合,研究了這兩種復合結構的光電化學性質,以及ATO反蛋白石骨架對于提升材料光電化學性能的作用與機理。主要研究內容如下:(1)采用無皂乳液聚合法制備了不同粒徑的聚苯乙烯微球(PS球),并通過垂直沉降法將PS球自組裝成三維膠體晶體,再通過溶膠-凝膠法制備了三維ATO反蛋白石結構。結果表明制備的PS球粒徑均一、分散性良好;組裝的膠體晶體是有序的面心立方結構(fcc),缺陷較少;三維ATO反蛋白石結構是一種大孔陣列結構。(2)以三維ATO反蛋白石為模板,通過水熱合成法成功制備了3D ATO/Fe_2O_3復合結構。探究了三維ATO模板中Sb摻雜量、PS球粒徑大小、模板厚度對光電化學性質的影響。實驗結果表明:(1)三維ATO在體系中起到的作用主要有兩個,一是ATO作為導電骨架,有利于電子的快速傳遞,提高了光電轉化效率;二是三維大孔結構有巨大的比表面積提供了更多的活性位點,同時提高了對光的利用率。(2)Sb摻雜量對復合結構的光電流性能有較大影響,當Sb摻雜量為25%時,3D ATO/Fe_2O_3復合結構在E vs.RHE為1.23V時光電流密度值達到1.04 m A/cm~2。(3)以三維ATO反蛋白石為模板,通過化學浴沉積法成功制備了3D ATO/Ti O2復合結構,并探究了前驅體溶液濃度、反應時間對復合結構形貌及光電化學性質的影響。結果顯示前驅體溶液濃度與反應時間會影響氧化鈦納米棒的形貌。當納米棒長度合適時,復合結構的光電化學性質較好,其光電流密度值在E vs.RHE為1.23V時高達到0.78m A/cm~2。
[Abstract]:Energy crisis and environmental pollution have become two serious problems restricting economic development. Photochemical cell is a green method to produce hydrogen by decomposing water into hydrogen by solar energy. Some semiconductor materials, such as Ti O _ 2O _ 2Fe _ 2T _ 2O _ 3H _ 2O _ 3Bi _ VO_4, have been used as photoanode materials for the production of hydrogen by photolysis of water. However, these semiconductor materials have some problems, such as short carrier diffusion distance, poor conductivity and low light absorption rate, which reduce their photoelectric conversion efficiency. Based on this, the three-dimensional ATO opal structure of Sb doped Sn O 2 was prepared and used as a conductive skeleton to composite with Fe_2O_3,Ti O 2 semiconductor material. The photochemical properties of the two structures were studied. And the effect and mechanism of ATO reverse opal skeleton on improving the photoelectric chemical properties of the material. The main contents are as follows: (1) Polystyrene microspheres (PS spheres) with different sizes were prepared by soap-free emulsion polymerization and PS spheres were self-assembled into three-dimensional colloidal crystals by vertical deposition. Three dimensional ATO opal structure was prepared by sol-gel method. The results show that the prepared PS spheres have uniform particle size and good dispersibility, the assembled colloidal crystals have less defects in (fcc), with ordered face-centered cubic structure, and the three-dimensional ATO reverse opal structure is a macroporous array structure. (2) Three-dimensional ATO reverse opal is used as template. The 3D ATO/Fe_2O_3 composite structure was successfully prepared by hydrothermal synthesis. The effects of the Sb doping amount and the thickness of the PS spheres on the photochemical properties of 3D ATO templates were investigated. The experimental results show that: (1) 3D ATO plays two main roles in the system. One is that ATO acts as a conductive skeleton, which is conducive to the rapid transfer of electrons and improves the efficiency of photoelectric conversion; Second, the large specific surface area of the three-dimensional macroporous structure provides more active sites and improves the utilization ratio of light. (2) the doping amount of Sb has a great influence on the photocurrent performance of the composite structure. When the doping amount of Sb is 25, the current density of 3D ATO/Fe_2O_3 composite structure reaches 1.04 Ma / cm ~ (2) at E vs.RHE = 1.23 V. (3) 3D ATO/Ti O _ 2 composite structure was successfully prepared by chemical bath deposition using three-dimensional ATO reverse opal as template, and the concentration of precursor solution was investigated. The influence of reaction time on the morphology and photochemical properties of the composite structure. The results show that the concentration of precursor solution and reaction time will affect the morphology of titanium oxide nanorods. When the length of nanorods is suitable, the photochemical properties of the composite structure are better, and the photocurrent density of the composite structure reaches 0.78 Ma / cm ~ (-2) when E vs.RHE is 1.23 V.
【學位授予單位】：華中農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332
本文編號：2246014
[Abstract]:Energy crisis and environmental pollution have become two serious problems restricting economic development. Photochemical cell is a green method to produce hydrogen by decomposing water into hydrogen by solar energy. Some semiconductor materials, such as Ti O _ 2O _ 2Fe _ 2T _ 2O _ 3H _ 2O _ 3Bi _ VO_4, have been used as photoanode materials for the production of hydrogen by photolysis of water. However, these semiconductor materials have some problems, such as short carrier diffusion distance, poor conductivity and low light absorption rate, which reduce their photoelectric conversion efficiency. Based on this, the three-dimensional ATO opal structure of Sb doped Sn O 2 was prepared and used as a conductive skeleton to composite with Fe_2O_3,Ti O 2 semiconductor material. The photochemical properties of the two structures were studied. And the effect and mechanism of ATO reverse opal skeleton on improving the photoelectric chemical properties of the material. The main contents are as follows: (1) Polystyrene microspheres (PS spheres) with different sizes were prepared by soap-free emulsion polymerization and PS spheres were self-assembled into three-dimensional colloidal crystals by vertical deposition. Three dimensional ATO opal structure was prepared by sol-gel method. The results show that the prepared PS spheres have uniform particle size and good dispersibility, the assembled colloidal crystals have less defects in (fcc), with ordered face-centered cubic structure, and the three-dimensional ATO reverse opal structure is a macroporous array structure. (2) Three-dimensional ATO reverse opal is used as template. The 3D ATO/Fe_2O_3 composite structure was successfully prepared by hydrothermal synthesis. The effects of the Sb doping amount and the thickness of the PS spheres on the photochemical properties of 3D ATO templates were investigated. The experimental results show that: (1) 3D ATO plays two main roles in the system. One is that ATO acts as a conductive skeleton, which is conducive to the rapid transfer of electrons and improves the efficiency of photoelectric conversion; Second, the large specific surface area of the three-dimensional macroporous structure provides more active sites and improves the utilization ratio of light. (2) the doping amount of Sb has a great influence on the photocurrent performance of the composite structure. When the doping amount of Sb is 25, the current density of 3D ATO/Fe_2O_3 composite structure reaches 1.04 Ma / cm ~ (2) at E vs.RHE = 1.23 V. (3) 3D ATO/Ti O _ 2 composite structure was successfully prepared by chemical bath deposition using three-dimensional ATO reverse opal as template, and the concentration of precursor solution was investigated. The influence of reaction time on the morphology and photochemical properties of the composite structure. The results show that the concentration of precursor solution and reaction time will affect the morphology of titanium oxide nanorods. When the length of nanorods is suitable, the photochemical properties of the composite structure are better, and the photocurrent density of the composite structure reaches 0.78 Ma / cm ~ (-2) when E vs.RHE is 1.23 V.
【學位授予單位】：華中農業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB332
【參考文獻】
相關期刊論文 前4條
1 于冰;叢海林;薛蕾;劉學松;陳昭晶;;膠體晶體制備與應用研究進展[J];科學通報;2014年09期
2 宋娟;陳啟明;嚴亞;;單分散PS微球的制備及其膠體晶體的組裝[J];華東師范大學學報(自然科學版);2010年05期
3 張桂臻;趙震;陳勝利;董鵬;;膠體晶體模板法制備三維有序大孔復合氧化物[J];化學進展;2009年05期
4 李澄;齊利民;;膠體晶體[J];大學化學;2006年05期
相關博士學位論文 前1條
1 郭思瑤;新型光催化材料的形貌調控及其光解水制氫性能研究[D];華中科技大學;2014年
相關碩士學位論文 前2條
1 徐鵬鵬;高效光催化材料的設計及其在光解水制氫中的應用[D];上海師范大學;2014年
2 孔維澤;高效改性TiO_2光催化劑光解水制氫的研究[D];華東理工大學;2012年
，本文編號：2246014
本文鏈接：http://sikaile.net/kejilunwen/cailiaohuaxuelunwen/2246014.html
最近更新
教材專著
