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hematite-photoanode
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Design and Optimization of Solar Hydrogen Production System Based on Photoelectrochemical Cell Model
, M.Sc. Thesis Sharif University of Technology ; Ghahnavieh, Rajabi (Supervisor) ; Moshfegh, Alireza (Supervisor) ; Naseri, Naimeh (Co-Supervisor)
Abstract
The optimized geometry and structure of iron oxide(Fe2O3) nanorod arrays as the photoanodes of photoelectrochemical cells have been calculated. Using finite element method, different structures have been studied in order to maximize the photocurrent density generated by the photoanodes. Two main characteristics of nanorod arrays namely the aspect ratio of nanorod and the density of nanorods in array have been selected as the variables. The absorbance of the photoanode has been calculated using Electromagnetic Waves Physics in COMSOL Multiphysics software. In this study, nanorods with aspect ratio of 3.6 to 40 have been varied and compared. The results reveal that the current density has a...
Effect of film morphology on water oxidation enhancement in NiFeCo modified hematite photoanodes
, Article Surface and Coatings Technology ; Volume 421 , 2021 ; 02578972 (ISSN) ; Sobhkhiz Vayghan, N ; Esfandiar, A ; Dabirian, A ; Sharif University of Technology
Elsevier B.V
2021
Abstract
Hematite (α-Fe2O3) is a promising candidate for water oxidation applications due to its abundance in the earth crust and its suitable bandgap. However, hematite performance is severely limited by electron-hole recombination at its interface with the electrolyte; something that can be addressed using electrocatalysts. In this report, we evaluate the influence of a ternary NiFeCo co-catalyst to enhance the water oxidation performance of hematite photoanodes. Thus, NiFeCo co-catalyst is optimized for hematite thin films with i) dense and ii) porous (nano-rod) morphologies. Both hematite films are prepared using electron beam evaporation method followed by an annealing step and NiFeCo...