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为提高光电化学分解水的效率,本文设计并制作了一种具有独特纳米结构与组分的光电极材料.首先利用水浴和原子层沉积(ALD)相结合的方法合成出以氧化铜纳米圆锥结构作为支架,氧化锌纳米棒作为树枝状的三维纳米结构,并进一步用这种结构作为光电极进行光解水.通过实验测试,在所有三维纳米结构中,生长参数为37个循环的原子层沉积氧化锌种子层、水浴反应时间为55分钟的三维p型氧化铜/n型氧化锌(p-CuO/n-ZnO)异质结光阴极材料具有最好的光解水性能.其光暗电流密度之比达到了6.4,远远高于比值为2.7的纯氧化铜电极.三维p-CuO/n-ZnO异质结材料所表现出的优异光解水性能归功于氧化铜和氧化锌形成的异质结,该异质结有效地促进了载流子的收集和分离、降低了载流子的复合几率、延长了载流子的寿命.本文也同时证明了利用原子层沉积技术设计并制作新型三维纳米结构光电极材料的可行性.
In order to improve the efficiency of photoelectrochemical decomposition of water, a photoelectrode material with unique nanostructures and components was designed and fabricated.Firstly, the photoelectrode materials with unique nanostructures and components were synthesized by a combination of water bath and atomic layer deposition (ALD) As a scaffold, zinc oxide nanorods were used as dendritic three-dimensional nanostructures and further photodissociated with this structure as photoelectrodes.According to experimental tests, in all three-dimensional nanostructures, growth parameters were 37 cycles of atomic layer deposition Zinc oxide seed layer and a water bath reaction time of 55 minutes, the three-dimensional p-type copper oxide / n-type zinc oxide (p-CuO / n-ZnO) heterojunction cathode material has the best photodissociation performance. Density ratio of 6.4, which is much higher than that of the pure copper oxide electrode with a ratio of 2.7.The excellent photolysis-water performance exhibited by the three-dimensional p-CuO / n-ZnO heterojunction materials is attributed to the formation of copper oxide and zinc oxide Heterojunction, the heterojunction effectively accelerates the collection and separation of carriers, reducing the recombination probability of carriers and prolonging the lifetime of the carriers.At the same time, this paper also proves that the design and fabrication of the heterojunction using atomic layer deposition New three-dimensional Feasibility electrode material structure of the photoelectric meters.