Iron Pyrite/Titanium Dioxide Photoanode for Extended Near Infrared Light Harvesting in a Photoelectrochemical Cell

Di Yan Wang, Cheng Hung Li, Shao Sian Li, Tsung Rong Kuo, Chin Ming Tsai, Tin Reui Chen, Ying Chiao Wang, Chun Wei Chen, Chia Chun Chen

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Abstract

The design of active and stable semiconducting composites with enhanced photoresponse from visible light to near infrared (NIR) is a key to improve solar energy harvesting for photolysis of water in photoelectrochemical cell. In this study, we prepared earth abundant semiconducting composites consisting of iron pyrite and Titanium oxide as a photoanode (FeS 2/TiO 2 photoanode) for photoelectrochemical applications. The detailed structure and atomic compositions of FeS 2/TiO 2 photoanode was characterized by high-resolution transmission electron microscopy (HRTEM), energy-dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD), inductively coupled plasma with atomic emission spectroscopy (ICPAES) and Raman spectroscopy. Through the proper sulfurization treatment, the FeS 2/TiO 2 photoanode exhibited high photoresponse from visible light extended to near infrared range (900 nm) as well as stable durability test for 4 hours. We found that the critical factors to enhance the photoresponse are on the elimination of surface defect of FeS 2 and on the enhancement of interface charge transfer between FeS 2 and TiO 2. Our overall results open a route for the design of sulfur-based binary compounds for photoelectrochemical applications.

Original languageEnglish
Article number20397
JournalScientific Reports
Volume6
DOIs
Publication statusPublished - 2016 Feb 8
Externally publishedYes

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    Wang, D. Y., Li, C. H., Li, S. S., Kuo, T. R., Tsai, C. M., Chen, T. R., Wang, Y. C., Chen, C. W., & Chen, C. C. (2016). Iron Pyrite/Titanium Dioxide Photoanode for Extended Near Infrared Light Harvesting in a Photoelectrochemical Cell. Scientific Reports, 6, [20397]. https://doi.org/10.1038/srep20397