This study examined a water-splitting system comprising a TiO₂ photoanode and an organo-photocathode consisting of a p–n bilayer.

A new successive system for hydrogenation of styrene was constructed using a two‐compartment cell separated by a Pd sheet electrode. The sole product in the hydrogenation of styrene was ethylbenzene. The amount of ethylbenzene produced increased linearly with electrolysis time after a certain induction period and the rate of ethylbenzene production depended on the applied current. The current efficiency for the production of ethylbenzene in this system exceeded 93% at an applied current of 10 mA.

The stoichiometric decomposition of hydrazine (N ₂ H ₄ ) into N ₂ and H ₂ was observed to occur efficiently in a photocatalysis system of an organic p–n bilayer.

An extremely low-biased water-splitting reaction occurred in a system containing a WO₃ photoanode and organo-photocathode.

An organic p–n bilayer showed dual catalysis ( i.e. photocatalysis and dark catalysis) for the oxidation of thiol along with the reduction of H ⁺ .