Traditionally, N-doped TiO (N-TiO) has been regarded as unsuitable for the oxygen evolution reaction (OER) under visible light. Ni-modified β-FeOOH nanorod cocatalysts enabled to use N 2p holes in the N-TiO photoanode induced by 400-500 nm visible light photons for the OER, enhancing anodic photocurrent of N-TiO with 13-fold with 100% faradaic efficiency.
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