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Design and Optimization of Solar Hydrogen Production System Based on Photoelectrochemical Cell Model

Elmi, Mohammad | 2020

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 52875 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Ghahnavieh, Rajabi; Moshfegh, Alireza; Naseri, Naimeh
  7. Abstract:
  8. 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 direct relation with increasing aspect ratio of nanorods and it would reach to its theoretical maximum. Furthermore, it was found that the density of nanorods in the arrays (number of nanorods per photoanode surface area) has an optimum value which is dependent on their aspect ratio. The optimized current density of the hematite photoanode containing nanorod arrays with aspect ratio of 5,10, and 20 are 11.8, 12.0, and 12.1 mA/cm2, respectively
  9. Keywords:
  10. Photoelectrochemical Cell ; Maxwell Equations ; Finite Element Method ; COMSOL Software ; Hydrogen Producing ; Hematite Photoanodes ; Water Oxidation

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