Water splitting by dimensionally stable anode prepared through micro-arc oxidation
2013
Shin, Sowoon | Choi, Yong-Wook | Choi, Jinsub
Dimensionally stable electrode (DSA) was prepared by coating Ru⁴⁺ and Ir⁴⁺ on various anodic TiO₂ substrates. The TiO₂ substrates were prepared using three anodization techniques; micro-arc oxidation, synthesis of TiO₂ nanotubes and formation of a barrier layer. Micro-arc oxidation at high potential produced irregular micropores. With nanotube synthesis, well-defined nanotubular pores were formed at relatively low potentials. To form the barrier layer, an oxide film was prepared in a single H₃PO₄ solution. Among the DSAs synthesized on the anodic substrates, the micropore structures showed the lowest overpotential for O₂ evolution, indicating this DSA to be most suitable as an electrode for water splitting.
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