Because the oxygen evolution reaction (OER) involves a complicated four-electron process, reducing the overpotential for the OER by loading cocatalysts at as high a concentration as possible is critical for achieving efficient photoelectrochemical (PEC) water oxidation. However, such surface modifications should also be designed to not interfere with the bandgap photoexcitation of the light-absorbing materials. In the present study, cobalt-phosphate-loaded TiO₂ (CoPi/TiO₂) nanoparticles were used to modify a particulate BaTaO₂N (BTON) photoanode, resulting in an improvement in the photoanode PEC OER performance. The TiO₂ nanoparticles functioned as a transparent and conductive support with a high specific surface area to immobilize CoPi on the photoanode surface. Electrochemical measurements revealed that the CoPi/TiO₂ modification led to improved reaction kinetics and that the electrochemically active surface area of the CoPi cocatalysts deposited on the electrode surface substantially increased by a factor of 7.45 as a result of the TiO₂ modification. The CoPi/TiO₂ modification increased the number of active sites on the surface of the particulate BTON photoanode and minimized the harmful influence of light shielding, thereby accelerating the OER kinetics.

中文翻译：

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在负载钴磷酸盐的 TiO2 纳米粒子修饰的 BaTaO2N 光阳极上加速光电化学析氧

由于析氧反应 (OER) 涉及复杂的四电子过程，因此通过以尽可能高的浓度负载助催化剂来降低 OER 的过电位对于实现有效的光电化学 (PEC) 水氧化至关重要。然而，此类表面改性也应设计为不干扰光吸收材料的带隙光激发。在本研究中，负载钴磷酸盐的 TiO ₂ (CoPi/TiO ₂ ) 纳米粒子用于改性颗粒 BaTaO ₂ N (BTON) 光阳极，从而提高光阳极 PEC OER 性能。钛白粉₂纳米粒子作为透明导电载体，具有高比表面积，可将 CoPi 固定在光阳极表面。电化学测量表明COPI /二氧化钛₂变形导致改进的反应动力学和沉积在电极表面上的助催化剂COPI的电化学活性表面积大幅上升的7.45倍如在TiO的结果₂修饰。CoPi/TiO ₂改性增加了颗粒状 BTON 光阳极表面活性位点的数量，并最大限度地减少了光屏蔽的有害影响，从而加速了 OER 动力学。