文章基本信息

标题：C@SiNW/TiO₂ Core-Shell Nanoarrays with Sandwiched Carbon Passivation Layer as High Efficiency Photoelectrode for Water Splitting
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作者：Rami Reddy Devarapalli ; Joyashish Debgupta ; Vijayamohanan K. Pillai 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep04897
出版社：Springer Nature
摘要：One-dimensional heterostructure nanoarrays are efficiently promising as high performance electrodes for photo electrochemical (PEC) water splitting applications, wherein it is highly desirable for the electrode to have a broad light absorption, efficient charge separation and redox properties as well as defect free surface with high area suitable for fast interfacial charge transfer. We present highly active and unique photoelectrode for solar H₂ production, consisting of silicon nanowires (SiNWs)/TiO₂ core-shell structures. SiNWs are passivated to reduce defect sites and protected against oxidation in air or water by forming very thin carbon layer sandwiched between SiNW and TiO₂ surfaces. This carbon layer decreases recombination rates and also enhances the interfacial charge transfer between the silicon and TiO₂. A systematic investigation of the role of SiNW length and TiO₂ thickness on photocurrent reveals enhanced photocurrent density up to 5.97 mA/cm² at 1.0 V vs.NHE by using C@SiNW/TiO₂ nanoarrays with photo electrochemical efficiency of 1.17%.