四氧化三钴修饰光阳极构建光分解水器件

发布时间：2018-03-26 02:09

  本文选题：水氧化　切入点：可见光分解水　出处：《哈尔滨工业大学》2015年硕士论文

【摘要】：人工模拟光合作用制备氢气,将太阳能直接转换为化学能,是解决21世纪能源短缺和环境污染问题的有效途径之一。实现这一目的的可行方法是构建可见光致水分解器件,在电极两侧分别完成水氧化和质子还原两个半反应。其中,水氧化过程极其复杂,成为制约光解水实现的瓶颈因素。突破这一障碍的关键在于开发高效水氧化催化剂。基于Ru、Ir等贵金属元素的氧化物或配合物的水氧化催化剂虽然具有很高的催化活性,但高昂的成本制约其实际应用。因此,研究基于廉价金属的水氧化催化剂具有很重要的实际意义。本文采用磷酸基团功能化的三联吡啶钌作为光敏剂并用其敏化二氧化钛光阳极。合成了粒径小于10nm的四氧化三钴纳米粒子作为催化剂,将其用柔性长链修饰到染料敏化光阳极表面,并进一步构建可见光分解水器件。光电性能测试表明,引入四氧化三钴催化剂后,光电流密度由15μA/cm2增长至140μA/cm2。本文还模拟植物光系统Ⅱ中Tyz-His190电子调节单元的结构,合成了仿生的电子调节剂,将其引入到光阳极表面。用此复合光阳极构建的器件光电流密度有了进一步增长,且电流衰减速度明显减慢,光照90s后光电流仍能保持稳定不变。
[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，

本文编号：1665868