García-Santos Lidia, Fernández-Catalá Javier, Berenguer-Murcia Ángel, Cazorla-Amorós Diego
Inorganic Chemistry Department, Materials Science Institute, University of Alicante, Ap. 99, 03080 Alicante, Spain.
Nanomaterials (Basel). 2024 Nov 12;14(22):1809. doi: 10.3390/nano14221809.
This work focuses on the production of methane through the photocatalytic reduction of carbon dioxide using Pt-doped CdS/TiO heterostructures. The photocatalysts were prepared using P25 commercial titania and CdS synthesized through a solvothermal methodology, followed by the impregnation of Pt onto the surface to enhance the physicochemical properties of the resulting photocatalysts. The pure and heterostructure-based materials were characterized using X-ray diffraction (XRD), inductively coupled plasma optical emission spectroscopy (ICP-OES), scanning electron microscopy (SEM) with energy dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-Vis), ultraviolet photoelectron spectroscopy (UPS), and photoluminescence spectroscopy (PL). The obtained results show the successful synthesis of the heterostructure impregnated with Pt. Moreover, the observed key role of CdS and Pt nanoparticles in the final semiconductor is to reduce the electron-hole pair recombination rate by acting as an electron sink, which slows down the recombination process and increases the photocatalyst efficiency. Thus, Pt-doped CdS/TiO heterostructures with the best observed composition presents better catalytic activity than P25 titania with methane production values being 460 and 397 µmol CH/g·h, respectively.
这项工作聚焦于使用铂掺杂的硫化镉/二氧化钛异质结构通过光催化还原二氧化碳来生产甲烷。光催化剂是使用P25商用二氧化钛和通过溶剂热法合成的硫化镉制备的，随后将铂浸渍到其表面以增强所得光催化剂的物理化学性质。使用X射线衍射（XRD）、电感耦合等离子体发射光谱（ICP - OES）、带有能量色散X射线光谱（EDX）的扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X射线光电子能谱（XPS）、紫外可见光谱（UV - Vis）、紫外光电子能谱（UPS）和光致发光光谱（PL）对纯材料和基于异质结构的材料进行了表征。所得结果表明成功合成了浸渍有铂的异质结构。此外，在最终的半导体中观察到的硫化镉和铂纳米颗粒的关键作用是通过充当电子阱来降低电子 - 空穴对的复合率，这减缓了复合过程并提高了光催化剂效率。因此，观察到的具有最佳组成的铂掺杂硫化镉/二氧化钛异质结构呈现出比P25二氧化钛更好的催化活性，甲烷产量分别为460和397 μmol CH₄/g·h。
