A BiVO₄ photoanode with exposed (040) facets was prepared to enhance its photoelectrochemical performance. The exposure of the (040) crystal planes of the BiVO₄ film was induced by adding NaCl to the precursor solution. The as-prepared BiVO₄ photoanode exhibits higher solar-light absorption and charge-separation efficiency compared to those of an anode prepared without adding NaCl. To our knowledge, the photocurrent density (1.26 mA cm⁻² at 1.23 V vs. RHE) of as-prepared BiVO₄ photoanode is the highest according to the reports for bare BiVO₄ films under simulated AM1.5G solar light, and the incident photon-to-current conversion efficiency is above 35% at 400 nm. The photoelectrochemical (PEC) water splitting performance was also dramatically improved with a hydrogen evolution rate of 9.11 μmol cm^-2 h^-1, which is five times compared with the BiVO₄ photoanode prepared without NaCl (1.82 μmol cm^-2 h^-1). Intensity-modulated photocurrent spectroscopy and transient photocurrent measurements show a higher charge-carrier transfer rate for this photoanode. These results demonstrate a promising approach for the development of high-performance BiVO₄ photoanodes which can be used for efficient PEC water splitting and degradation of organic pollutants.

制备具有暴露的（040）面的BiVO ₄光电阳极，以增强其光电化学性能。通过将NaCl添加到前体溶液中，诱导BiVO ₄膜的（040）晶面暴露。所制备的BiVO ₄光电阳极与不添加NaCl的阳极相比，具有更高的太阳光吸收和电荷分离效率。据我们所知，根据裸BiVO ₄的报告，所制备的BiVO ₄光电阳极的光电流密度（1.23 V处的RHE为1.26 mA cm ^-2）相对于RHE最高。在模拟的AM1.5G太阳光下拍摄薄膜，入射光子到电流的转换效率在400 nm时高于35％。氢的析出速率为9.11μmolcm ^-2 h ^-1，光电化学（PEC）的水分解性能也得到了显着改善，这是不使用NaCl（1.82μmolcm ^-2 h ^-1）制备的BiVO ₄光电阳极的五倍。。强度调制光电流光谱法和瞬态光电流测量结果表明，该光阳极具有更高的电荷载流子传输速率。这些结果证明了开发高性能BiVO ₄的有前途的方法 可用于有效的PEC水分解和有机污染物降解的光阳极。