The synthesis of perovskite oxynitrides, which are promising photoanode candidates for solar energy conversion, is normally accomplished by high-temperature ammonolysis of oxides and carbonate precursors, thus making the deposition of their planar films onto conductive substrates challenging. Here, we proposed a facile strategy to prepare a series of perovskite oxynitride films. Taking SrTaO N as a prototype, we prepared SrTaO N films on Ta foils under NH flow by utilizing the vaporized SrCl /SrCO eutectic salt. The SrTaO N films exhibit solar water-splitting photocurrents of 3.0 mA cm at 1.23 V vs. RHE (reversible hydrogen electrode), which increases by 270% compared to the highest photocurrent (1.1 mA cm at 1.23 V vs. RHE) of SrTaO N reported in the literature. This strategy may also be applied to directly prepare a series of perovskite oxynitride films on conductive substrates such as ATaO N (A = Ca, Ba) and ANbO N (A = Sr, Ba).
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