材料科学
光电流
分解水
纳米棒
介电谱
异质结
二氧化钛
半导体
光电子学
化学工程
剥脱关节
能量转换效率
吸收(声学)
光催化
纳米技术
电化学
电极
化学
石墨烯
生物化学
物理化学
复合材料
工程类
冶金
催化作用
作者
Jie Gao,Shengqi Zhang,Xiaoqing Ma,Yi Sun,Xiaoyan Zhang
出处
期刊:Nanomaterials
[Multidisciplinary Digital Publishing Institute]
日期:2023-04-06
卷期号:13 (7): 1293-1293
摘要
As one of the widely studied semiconductor materials, titanium dioxide (TiO2) exhibits high photoelectrochemical (PEC) water-splitting performance as well as high chemical and photo stability. However, limited by a wide band gap and fast electron-hole recombination rate, the low solar-to-hydrogen conversion efficiency remains a bottleneck for the practical application of TiO2-based photoelectrodes. To improve the charge separation and water oxidation efficiency of TiO2 photoanodes, antimonene, a two-dimensional (2D) material obtained by liquid-phase exfoliation, was assembled onto TiO2 nanorod arrays (TNRAs) by a simple drop-coating assembly process. PEC measurements showed that the resulting 2D Sb/TiO2 photoelectrode displayed an enhanced photocurrent density of about 1.32 mA cm−2 in 1.0 M KOH at 0.3 V vs. Hg/HgO, which is ~1.65 times higher than that of the pristine TNRAs. Through UV-Vis absorption and electrochemical impedance spectroscopy measurements, it was possible to ascribe the enhanced PEC performances of the 2D Sb/TiO2 photoanode to increased absorption intensity in the visible light region, and improved interfacial charge-transfer kinetics in the 2D Sb/TiO2 heterojunction, which promotes electron-hole separation, transfer, and collection.
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