Alomair Nuhad Abdullah, Al-Aqeel Nouf Saleh, Alabbad Sanaa Saad, Kochkar Hafedh, Berhault Gilles, Younas Muhammad, Jomni Fathi, Hamdi Ridha, Ercan Ismail
Department of Chemistry, College of Science, Imam Abdulrahman Bin Faisal University, P. O. Box 1982, 31441 Dammam, Saudi Arabia.
Basic & Applied Scientific Research Center, Imam Abdulrahman Bin Faisal University, P. O. Box 1982, 31441 Dammam, Saudi Arabia.
ACS Omega. 2023 Feb 24;8(9):8303-8319. doi: 10.1021/acsomega.2c06717. eCollection 2023 Mar 7.
To evaluate the potential role of in situ formed Sr-Ti-O species as a ferroelectric component able to enhance the photocatalytic properties of an adjacent TiO semiconductor, Cu-doped/graphene oxide (GO)/TiO nanotubes (TiNTs) composites (with 0.5 wt % Cu and 1.0 wt % GO) have been synthesized while progressive amounts of strontium (up to 1.0 wt %) were incorporated at the surface of the composite through incipient wetness impregnation followed by post-thermal treatment at 400 °C. The different resulting photocatalytic systems were then first deeply characterized by means of N adsorption-desorption measurements, X-ray diffraction (XRD), UV-vis diffuse reflectance (UV-vis DR), Raman and photoluminescence (PL) spectroscopies, and scanning electron microscopy (SEM) (with energy-dispersive X-ray (EDX) spectroscopy and -mapping). In a second step, optimization of the kinetic response of the Sr-containing composites was performed for the formic acid photodegradation under UV irradiation. The Sr-containing Cu/GO/TiNT composites were then fully characterized by electrochemical impedance spectroscopy (EIS) for their dielectric properties showing clearly the implication of polarization induced by the Sr addition onto the stabilization of photogenerated charges. Finally, a perfect correlation between the photocatalytic kinetic evaluation and dielectric properties undoubtedly emphasizes the role of ferroelectric polarization as a very valuable approach to enhance the photocatalytic properties in an adjacent semiconductor.
为了评估原位生成的Sr-Ti-O物种作为一种铁电组分增强相邻TiO半导体光催化性能的潜在作用，合成了Cu掺杂/氧化石墨烯（GO）/TiO纳米管（TiNTs）复合材料（含0.5 wt% Cu和1.0 wt% GO），同时通过初湿浸渍法在复合材料表面引入逐渐增加量的锶（最高达1.0 wt%），随后在400℃进行后热处理。然后，首先通过N吸附-脱附测量、X射线衍射（XRD）、紫外-可见漫反射（UV-vis DR）、拉曼光谱和光致发光（PL）光谱以及扫描电子显微镜（SEM）（配备能量色散X射线（EDX）光谱和映射）对不同的光催化体系进行深入表征。第二步，对含Sr复合材料在紫外光照射下甲酸光降解的动力学响应进行优化。然后通过电化学阻抗谱（EIS）对含Sr的Cu/GO/TiNT复合材料的介电性能进行全面表征，结果清楚地表明了Sr添加所诱导的极化对光生电荷稳定化的影响。最后，光催化动力学评估与介电性能之间的完美相关性无疑强调了铁电极化作为增强相邻半导体光催化性能的一种非常有价值方法的作用。
