Crystalline TiO2 protective layer with graded oxygen defects for efficient and stable silicon-based photocathode
MetadataShow full item record
© 2018, The Author(s). The trade-offs between photoelectrode efficiency and stability significantly hinder the practical application of silicon-based photoelectrochemical devices. Here, we report a facile approach to decouple the trade-offs of silicon-based photocathodes by employing crystalline TiO2 with graded oxygen defects as protection layer. The crystalline protection layer provides high-density structure and enhances stability, and at the same time oxygen defects allow the carrier transport with low resistance as required for high efficiency. The silicon-based photocathode with black TiO2 shows a limiting current density of ~35.3 mA cm-2 and durability of over 100 h at 10 mA cm-2 in 1.0 M NaOH electrolyte, while none of photoelectrochemical behavior is observed in crystalline TiO2 protection layer. These findings have significant suggestions for further development of silicon-based, III–V compounds and other photoelectrodes and offer the possibility for achieving highly efficient and durable photoelectrochemical devices.
Showing items related by title, author, creator and subject.
Defect-Enhanced Charge Separation and Transfer within Protection Layer/Semiconductor Structure of Photoanodes.Zheng, Jianyun; Lyu, Y.; Xie, C.; Wang, R.; Tao, L.; Wu, H.; Zhou, H.; Jiang, San Ping; Wang, S. (2018)Silicon (Si) requires a protection layer to maintain stable and long-time photoanodic reaction. However, poor charge separation and transfer are key constraint factors in protection layer/Si photoanodes that reduce their ...
Innovative platforms for oral microencapsulation formulation and drug analytical techniques for anti-diabeticsGedawy, Ahmed Abou Bakr Gaber (2020)This thesis is divided into two main sections. The first section is about developing of silicon-based pharmaceutical platform that was used to encapsulate an anti-diabetic agent (metformin). These developed microcapsules ...
Stability of Chemically Passivated Silicon Electrodes in Aqueous Solutions: Interplay between Bias Voltage and Hydration of the ElectrolyteGonçales, V.; Wu, Y.; Gupta, B.; Parker, S.; Yang, Y.; Ciampi, Simone; Tilley, R.; Gooding, J. (2016)Chemical passivation of nonoxide semiconductors is a key prerequisite for electrochemical devices that operate in water-based electrolytes. Silicon remains the technologically most important material and organic monolayers ...