研究目的
To improve the photoelectrochemical performance of p-type dye-sensitized solar cells (p-DSSCs) by introducing a novel hierarchical nanocomposite of NiO nanoparticles anchored on highly ordered mesoporous carbons CMK-3 (NiO/CMK-3).
研究成果
A hierarchical NiO/CMK-3 nanocomposite was synthesized using CMK-3 as a template and backbone to support and avoid the NiO nanoparticles aggregation. The hierarchical nanostructure possesses a large surface area that can absorb many more dye molecules and trap more light. A p-DSSC device fabricated using NiO/CMK-3 photocathodes showed photovoltaic conversion efficiency as high as 1.48%. The device also showed superior hole transport kinetics, fast hole transport, long hole lifetime, prohibition of recombination, and hole collection efficiency.
研究不足
The study focuses on the improvement of p-DSSCs using NiO/CMK-3 nanocomposite, but the efficiency is still not on a comparable level to that of n-DSSCs, which is due to the mismatching of dye, electrolyte, and p-type semiconductor.
1：Experimental Design and Method Selection:
The study involved the synthesis of a hierarchical NiO/CMK-3 nanocomposite using CMK-3 as a template and backbone to support NiO nanoparticles.
2：Sample Selection and Data Sources:
Mesoporous CMK-3 was prepared, and NiO/CMK-3 composite was synthesized by dispersing CMK-3 into deionized water, followed by the addition of Ni(NO3)2·6H2O, hexamethylenetetramine (HMT), and citric acid trisodium salt dehydrate.
3：List of Experimental Equipment and Materials:
Rigaku X-ray diffractometer, field-emission scanning electron microscope (FESEM), transmission electron microscope (TEM), scanning transmission electron microscope (STEM), X-ray photoelectron spectroscopy (XPS), Thermal Gravimetric Analysis (TGA), NOVA 2000e instrument for N2 adsorption-desorption data.
4：Experimental Procedures and Operational Workflow:
The solution was sonicated, stirred, centrifuged, washed, dried, and thermally treated. The photocathode semiconductor films were made by a two-step method on fluorine-doped tin oxide (FTO) conductive glass.
5：Data Analysis Methods:
The structure and morphology of the NiO nanomaterials were characterized using various techniques, and the photoelectrochemical performance was evaluated.
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