Oxygen evolution is kinetically the key step in the photocatalytic water splitting, but it is negatively affected by the poor charge transport properties. However, this can be modified by the loading of cocatalysts on the surface of a semiconductor which could form heterojunctions to boost the charge separation and lower the activation potential for O₂ evolution. In this paper we demonstrate that the poor O₂ evolution activity of photocatalytic water splitting of the multiferroics BiFeO₃ can be enhanced when a proper cocatalyst like IrO₂ nanoparticles are deposited on the surface and proper electron scavenger is used. The choice of the persulfate, S₂O₈ as electron scavenger is influenced by its high redox potential and its close position to the valence band of BiFeO₃ compared to other commonly used scavengers. Another interesting information was revealed by using transient absorption spectroscopy under different environment namely, inert, oxidizing and reducing. The absorption peak of holes was identified and correlated to the strong absorption around 560 nm The hole absorption peak showed a 50% decrease in the absorption intensity after 2.5 μsec indicating that holes are captured by IrO₂ nanoparticles on the surface. O₂ evolution of multiferroics, especially BiFeO₃ has been less investigated. Therefore, the development of efficient photocatalytic materials has relied on both photocatalysts and cocatalysts. Identification of the photogenerated charge absorption peak from transient absorption spectra facilitate the evaluation of the IrO₂ loading effect on the charge separation and the overall O₂ evolution process.

析氧在动力学上是光催化分解水的关键步骤，但它受到电荷传输性能差的负面影响。然而，这可以通过在半导体表面加载助催化剂来改变，这可以形成异质结以促进电荷分离并降低 O ₂析出的活化电位。在本文中，我们证明，当适当的助催化剂（如 IrO ₂纳米粒子）沉积在表面上并使用适当的电子清除剂时，可以增强多铁性 BiFeO ₃光催化分解水的较差 O ₂析出活性。过硫酸盐的选择，S ₂ O ₈因为与其他常用的清除剂相比，电子清除剂受其高氧化还原电位和靠近 BiFeO ₃价带的位置的影响。通过在惰性、氧化和还原等不同环境下使用瞬态吸收光谱，揭示了另一个有趣的信息。确定了空穴的吸收峰并将其与 560 nm 附近的强吸收相关联。空穴吸收峰在 2.5 微秒后显示吸收强度降低 50%，表明空穴被表面上的IrO ₂纳米颗粒捕获。多铁性材料的O ₂演化，尤其是 BiFeO ₃已被较少调查。因此，高效光催化材料的开发既依赖于光催化剂，也依赖于助催化剂。从瞬态吸收光谱识别光生电荷吸收峰有助于评估 IrO ₂负载对电荷分离和整体 O ₂演化过程的影响。