Enhancing photoelectrochemical activity with three-dimensional p-CuO/n-ZnO junction photocathodes
Enhancing photoelectrochemical activity with three-dimensional p-CuO/n-ZnO junction photocathodes
复制标题
利用三维 p-CuO/n-ZnO 结光电阴极增强光电化学活性
DOI：
10.1007/s40843-016-5054-6
复制
发表时间：
2016-10-01
影响因子：
8.1
通讯作者：
Li, Liang
中科院分区：
文献类型：
--
作者：
Wu, Fangli;Cao, Fengren;Li, Liang
Designing photoelectrodes with particular nanostructure and composition has been regarded as a promising approach to improve the photoelectrochemical (PEC) water splitting efficiency. We report the design and synthesis of a three-dimensional (3D) nanostructure with CuO nanocones as backbones and ZnO nanorods as branches, using a facile water bath reaction process together with the atomic layer deposition (ALD) technology. As utilized in photocathodes, the optimized CuO/ZnO nanostructure, 37 cycles of ALD ZnO seedlayer and 55 min of water bath reaction of ZnO nanorods, demonstrate highly improved PEC performance. The ratio of photo to dark current density for the 3D CuO/ZnO is 6.4, much higher than the value of 2.7 for the CuO electrode. The enhanced activity is attributed to the synergistic effects of effective carrier separation and collection, reduced charge recombination, and increased carrier lifetime in the CuO/ZnO heterojunction. This work demonstrates the feasibility of designing novel 3D nanostructures by ALD technology as efficient photoelectrodes.摘要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.