Dubey Raghvendra S, Jadkar Sandesh R, Bhorde Ajinkya B
Advanced Research Laboratory for Nanomaterials and Devices, Department of Nanotechnology, Swarnandhra College of Engineering and Technology, Seetharampuram, Narsapur (A.P.) 534280, India.
Department of Physics, Savitribai Phule Pune University, (M.S.) Pune 411007, India.
ACS Omega. 2021 Jan 29;6(5):3470-3482. doi: 10.1021/acsomega.0c01614. eCollection 2021 Feb 9.
Few works are reported on solvothermal preparation of nanoparticles by utilizing acetone alone without a surfactant. This synthesis approach is found to be prominent for producing the mesoporous structure, which is crucial in improving the dye loading of the photoanode. In addition, doping of metal ions is advantageous in order to bring down the excitation energy, which is promising for boosting the performance of the doped oxides. This research aims to synthesize various kinds of doped-TiO nanocrystals to serve as photoanode materials in dye-sensitized solar cells (DSSCs). An X-ray diffraction study evidenced the existence of the crystalline phase in pure and doped-TiO nanocrystals. Rietveld refinement study showed the mixed phases of crystalline TiO in the CrT, CuNT, and ST as compared to a single anatase phase in the samples PT, AgT, BT, CoT, FeT, SnT, ZT, VT, and ZMT. The absorption spectroscopy analysis demonstrated the reduced optical band gap from 3.10 to 2.79 eV. Scanning electron microscopy investigation endorsed the formation of TiO mesoporous microspheres with a mean diameter ranging from 200 to 331 nm along with a nanocrystal diameter ranging from 10 to 20 nm. Doping with the different dopants enhanced the conversion efficiency of DSSCs from 1.31 to ∼6%. Furthermore, we have performed the electrochemical impedance spectroscopy of DSSCs, and the findings are presented.
关于仅使用丙酮而不添加表面活性剂通过溶剂热法制备纳米颗粒的研究报道较少。发现这种合成方法对于产生介孔结构非常突出，这对于提高光阳极的染料负载至关重要。此外，金属离子掺杂有利于降低激发能，这对于提高掺杂氧化物的性能很有前景。本研究旨在合成各种掺杂的TiO纳米晶体，用作染料敏化太阳能电池（DSSC）中的光阳极材料。X射线衍射研究证明了纯TiO纳米晶体和掺杂TiO纳米晶体中晶相的存在。Rietveld精修研究表明，与PT、AgT、BT、CoT、FeT、SnT、ZT、VT和ZMT样品中的单一锐钛矿相相比，CrT、CuNT和ST中的TiO为混合相。吸收光谱分析表明光学带隙从3.10 eV降低到2.79 eV。扫描电子显微镜研究证实形成了平均直径为200至331 nm的TiO介孔微球以及直径为10至20 nm的纳米晶体。用不同的掺杂剂进行掺杂可将DSSC的转换效率从1.31%提高到约6%。此外，我们还进行了DSSC的电化学阻抗谱分析，并展示了研究结果。
