Photoelectrochemistry at the Mineral/water Interface and Naturally Occurring Two-layer Solar Cells
- ISBN-10
- 1369720327
- ISBN-13
- 9781369720327
- Category
- Photochemistry
- Pages
- 30
- Language
- English
- Published
- 2015
- Author
- Jennifer Rose Morey
Description
Sunlight driven chemical reactions occurring at the mineral/water interface may be an underappreciated contributor to low temperature geochemical cycles. Water oxidation and hydrogen reduction reactions occurring in water have the capacity to generate highly reactive oxygen species in the water, which can further react with dissolved organic and inorganic molecules to drive geochemical cycles. Semiconducting oxides and sulfides can absorb sunlight to form such species. In this study, two sulfide minerals (pyrite and marcasite) and natively grown oxidation layers are studied with electrochemical characterization techniques to assess the impact of photochemical reactions occurring at the mineral/water interface. The band gap of pyrite was determined to be 0.95 eV by using a novel approach of measurement across a wide pH range; consistent with literature measurements. Results for band edge position shifts are consistent with the Nernst Equation, which supports the validity of the measured values and technique. These techniques are highly applicable to many aqueous geologic systems and could be extended to many other semiconducting minerals. Implications for solar energy are also discussed.
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