Fazil Mohd, Alshehri Saad M, Mao Yuanbing, Ahmad Tokeer
Nanochemistry Laboratory, Department of Chemistry, Jamia Millia Islamia, New Delhi 110025, India.
Department of Chemistry, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia.
Langmuir. 2024 Feb 27;40(8):4063-4076. doi: 10.1021/acs.langmuir.3c02860. Epub 2024 Feb 14.
Highly efficient nanocatalysts with a high specific surface area were successfully synthesized by a cost-effective and environmentally friendly hydrothermal method. Structural and elemental purity, size, morphology, specific surface area, and band gap of pristine and 1 to 5% Cu-doped TiO nanoparticles were characterized by powder X-ray diffraction (PXRD), X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), energy dispersive X-ray analysis (EDAX), inductively coupled plasma mass spectrometry (ICP-MS), liquid chromatography-high resolution mass spectrometry (LC-HRMS), scanning electron microscopy (SEM), transmission electron microscopy (TEM), BET surface area, Raman spectroscopy, photoluminescence spectroscopy (PL) and UV-visible diffused reflectance spectroscopy (UV-DRS) studies. The XPS and EPR findings indicated the successful integration of Cu ions into the TiO lattice. UV-DRS and BET surface area investigations revealed that with an increase in dopant concentration, Cu-doped TiO NPs show a decrease in band gap (3.19-3.08 eV) and an increase in specific surface area (169.9-188.2 m/g). Among all compositions, 2.5% Cu-doped TiO has shown significant H evolution with an apparent quantum yield of 17.67%. Furthermore, the electrochemical water-splitting study shows that 5% Cu-doped TiO NPs have superiority over pristine TiO for H evolution reaction. It was thus revealed that the band gap tuning with the desired dopant concentration led to enhanced photo/electrocatalytic sustainable energy applications.
通过一种经济高效且环境友好的水热法成功合成了具有高比表面积的高效纳米催化剂。采用粉末X射线衍射（PXRD）、X射线光电子能谱（XPS）、电子顺磁共振（EPR）、能量色散X射线分析（EDAX）、电感耦合等离子体质谱（ICP-MS）、液相色谱-高分辨率质谱（LC-HRMS）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、BET比表面积、拉曼光谱、光致发光光谱（PL）和紫外-可见漫反射光谱（UV-DRS）研究对原始的以及1%至5%铜掺杂的TiO纳米颗粒的结构、元素纯度、尺寸、形态、比表面积和带隙进行了表征。XPS和EPR研究结果表明铜离子成功整合到TiO晶格中。UV-DRS和BET比表面积研究表明，随着掺杂剂浓度的增加，铜掺杂的TiO纳米颗粒的带隙减小（3.19 - 3.08 eV），比表面积增加（169.9 - 188.2 m/g）。在所有组成中，2.5%铜掺杂的TiO表现出显著的析氢性能，表观量子产率为17.67%。此外，电化学水分解研究表明，5%铜掺杂的TiO纳米颗粒在析氢反应方面优于原始的TiO。因此揭示了通过所需的掺杂剂浓度进行带隙调节可增强光/电催化可持续能源应用。
