Effect of Sn valence state in the in situ growth of FeOOH precursor on the performance of the α-Fe2O3 photoanode

Sn-doped Fe 2 O 3 photoanodes are fabricated by employing a tin salt precursor with different Sn valence states, and Sn 4+ ions are incorporated in the Fe 2 O 3 photoanode.