Higher Secondary Education

• E1 Construction of the 2-pot, 1-pot and compact cell using TiO₂-photoelectrodes (made from Hombikat 100), U- and I-measurements under irradiation with light of different λ-ranges
  Extra: Detection of the products Br₂(aq) and H₂(g) in the 2-pot cell
• E2 Sensitization of the TiO₂-photoelectrodes with anthocyanines from raspberry juice, U- and I-measurements under irradiation with light of different λ-ranges
• E3 Construction of translucid and transparent compact cells with photoelectrodes made from stabilized suspensions of nano-TiO₂ by a) coating with a sharp edge and b) spincoating on FTO glass using a transparent gel electrolyte utilizing polyvinyl alcohol
  • German Article with Information regarding E3
  • Video: Compact Cells in Sunlight

Technical Contents

TiO₂ as electrical semi-conductor, energy band model, band gap, E_g, electrochemical elementary processes at the electrodes, determining factors for the open circuit voltage and the short-circuit current of a cell, chemical elementary processes during sensibilisation; relation: particle structure and color of the substance as well as the relation energy of the light quanta and color of the light

Scope

Electro chemistry (galvanic cells; conduction of electricity in metals, solutions and semi-conductors); energetics (relation: color-λ-E of photons and color-E_g in nano particles); physics: electrical characteristics and circuits; chemistry/physics: nano structured materials