Why Cu2O used mostly in water splitting and H2 generation rather than CuO?

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Sujoy Sarkar

The difference in the band gaps of the materials is the main reason of using Cu2O for water splitting. The band gap of Cu2O is 2.17 eV while the other, CuO, shows the band gap at 1.2 eV. And for visible light water splitting, Cu2O is an obvious choice over CuO.

Saurav Sorcar

Thank you so much.

Zhichun Si

In addition to the above mentioned, Cu2O is more stable than CuO in water.

But as I know, Cu2O is also unstable in water because of its redox potential lying in between the reduction potential of water splitting..isn't it?

Sanjit Manohar Majhi

Cu2O is changed CuO when it is heated at around 300-400 deg C. so it is not stable.