Barium hydrogen phosphate (BaHPO₄) thin films were electrodeposited on fluorine-doped tin oxide (FTO) and used as electrocatalysts for organics degradation. The effects of applied current density and deposition time on the phase and morphology of electrodeposited films were analyzed with X-ray diffraction (XRD), scanning electron microscopy (SEM), attenuated total reflectance-Fourier-transform infrared (ATR-FTIR) spectroscopy, Raman spectroscopy, electrochemical impedance spectroscopy (Mott–Schottky) plots, and photocurrent response. The electrodeposited BaHPO₄ films crystallize in the orthorhombic structure and form platelets on the FTO substrate. Response surface methodology (RSM) was used to optimize the operational conditions. Four independent process variables were considered: NaCl concentration, rhodamine B (RhB) initial concentration, applied current density, and reaction time. Based on the model prediction, the optimum conditions for RhB degradation were determined with the maximum RhB degradation of 98.78%. The corresponding experimental value of RhB degradation under the optimum conditions was determined as 99%, which is very close to the optimized one, implying that RSM is a powerful strategy for the process optimization. The photoelectrochemical degradation of RhB, performed at optimal operational conditions, allowed the very fast degradation rates of almost 99% during 7 min due to the synergic effect while combining photocatalysis and electrocatalysis.

将磷酸氢钡（BaHPO ₄）薄膜电沉积在掺氟氧化锡（FTO）上，并用作有机物降解的电催化剂。用X射线衍射（XRD），扫描电子显微镜（SEM），衰减全反射-傅里叶变换红外光谱（ATR-FTIR）分析了施加的电流密度和沉积时间对电沉积膜的相和形态的影响，拉曼光谱，电化学阻抗光谱（莫特-肖特基）图和光电流响应。电沉积的BaHPO ₄薄膜以正交晶体结构结晶，并在FTO基板上形成血小板。响应面方法（RSM）用于优化操作条件。考虑了四个独立的过程变量：NaCl浓度，若丹明B（RhB）初始浓度，施加的电流密度和反应时间。根据模型预测，确定了RhB降解的最佳条件，最大RhB降解率为98.78％。在最佳条件下，RhB降解的相应实验值确定为99％，非常接近优化值，这表明RSM是工艺优化的强大策略。在最佳操作条件下进行RhB的光电化学降解，