Yao Li , Chenglong Ding , Yanming Li , Jiongchong Fang , Guosong Zeng , Jingfu He , Changli Li
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引用次数: 0
Abstract
Photoelectrochemical (PEC) water splitting provides a potential method to produce renewable hydrogen energy, but there is still plenty of room for improving the efficiency and stability of photoelectrodes. In this paper, we present a metal–insulator-semiconductor (MIS) structure based on p-Si that enables stable and efficient water splitting by engineering the interfacial insulating layer. The silicon oxide (SiOx) film with appropriate thickness and low defects is regrown by a chemical oxidation process, which provides a high-quality insulating layer to passivate the p-Si. The carrier flux, barrier height and interfacial resistance of p-Si based MIS junction can be systematically tuned by controlling the thickness and quality of SiOx layer. Under AM 1.5G illumination, the optimized p-Si/SiOx/Ti/Pt photoelectrode shows an onset potential of 0.5 V vs. RHE, a maximum photocurrent of 28 mA/cm2 and a high applied bias photon-to-current efficiency (ABPE) of 6 %. These results have significant implications for constructing MIS photoelectrodes towards effective water splitting.
光电化学(PEC)分水技术为生产可再生氢能提供了一种潜在的方法,但在提高光电极的效率和稳定性方面仍有很大的改进空间。在本文中,我们介绍了一种基于对硅的金属-绝缘体-半导体(MIS)结构,该结构通过对界面绝缘层的工程设计实现了稳定高效的水分离。通过化学氧化工艺重新生长出厚度合适、缺陷较少的氧化硅(SiOx)薄膜,为对硅提供了高质量的钝化绝缘层。通过控制氧化硅层的厚度和质量,可以系统地调整基于对硅的 MIS 结的载流子通量、阻挡层高度和界面电阻。在 AM 1.5G 光照下,优化的对硅/氧化硅/钛/铂光电极的起始电位为 0.5 V,最大光电流为 28 mA/cm2,外加偏压光子对电流效率 (ABPE) 高达 6%。这些结果对于构建 MIS 光电极以实现有效的水分离具有重要意义。
期刊介绍:
The Journal of Catalysis publishes scholarly articles on both heterogeneous and homogeneous catalysis, covering a wide range of chemical transformations. These include various types of catalysis, such as those mediated by photons, plasmons, and electrons. The focus of the studies is to understand the relationship between catalytic function and the underlying chemical properties of surfaces and metal complexes.
The articles in the journal offer innovative concepts and explore the synthesis and kinetics of inorganic solids and homogeneous complexes. Furthermore, they discuss spectroscopic techniques for characterizing catalysts, investigate the interaction of probes and reacting species with catalysts, and employ theoretical methods.
The research presented in the journal should have direct relevance to the field of catalytic processes, addressing either fundamental aspects or applications of catalysis.