title: Iron Pyrite/Titanium Dioxide Photoanode for Extended Near Infrared Light Harvesting in a Photoelectrochemical Cell.
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 (FeS2/TiO2 photoanode) for photoelectrochemical applications. The detailed structure and atomic compositions of FeS2/TiO2 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 FeS2/TiO2 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 FeS2 and on the enhancement of interface charge transfer between FeS2 and TiO2. Our overall results open a route for the design of sulfur-based binary compounds for photoelectrochemical applications.
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
authors: Di-Yan
authors: DY
authors: Wang
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
authors: Cheng-Hung
authors: CH
authors: Li
authors: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors: Shao-Sian
authors: SS
authors: Li
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
authors: Tsung-Rong
authors: TR
authors: Kuo
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
authors: Chin-Ming
authors: CM
authors: Tsai
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.
authors: Tin-Reui
authors: TR
authors: Chen
authors: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors: Ying-Chiao
authors: YC
authors: Wang
authors: Department of Materials Science and Engineering, National Taiwan University, Taipei 10617, Taiwan.
authors: Chun-Wei
authors: CW
authors: Chen
authors: Department of Chemistry, National Taiwan Normal University, Taipei 11677, Taiwan.|Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
authors: Chia-Chun
authors: CC
authors: Chen