Abstract
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(2)N as a prototype, we prepared SrTaO(2)N films on Ta foils under NH(3) flow by utilizing the vaporized SrCl(2)/SrCO(3) eutectic salt. The SrTaO(2)N films exhibit solar water-splitting photocurrents of 3.0 mA cm(-2) at 1.23 V vs. RHE (reversible hydrogen electrode), which increases by 270% compared to the highest photocurrent (1.1 mA cm(-2) at 1.23 V vs. RHE) of SrTaO(2)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(2)N (A = Ca, Ba) and ANbO(2)N (A = Sr, Ba).