研究目的
To overcome the severe aggregation of reduced graphene oxide nanosheets and their weak adhesion to the conductive substrate, which largely restricts the electrocatalytic property, by proposing a simple strategy for fabrication of efficient reduced graphene oxide film through in-situ thermal conversion of graphene oxide film.
研究成果
The study demonstrates a simple and feasible strategy to fabricate uniform RGO films with strong adhesion through thermal conversion of GO films. The DSSC with the thermal-converted RGO CE yields a power conversion efficiency of 6.35%, which is 5.3 times that of the DSSC with the directly adsorbed RGO CE. The RGO CE achieves an impressive fill factor of 0.73, highlighting its potential as a low-cost and efficient counter electrode for dye-sensitized solar cells.
研究不足
The study focuses on the fabrication and characterization of RGO films through in-situ thermal conversion of GO films. The limitations include the specific conditions required for the thermal conversion process and the comparison with only one alternative method (direct adsorption of RGO nanosheets).
1：Experimental Design and Method Selection:
The study involves the fabrication of reduced graphene oxide (RGO) films through in-situ thermal conversion of graphene oxide (GO) films adsorbed onto conductive substrates. The method includes annealing GO films in nitrogen atmosphere to convert them into RGO films.
2：Sample Selection and Data Sources:
GO was prepared according to the modified Hummers’ method. The RGO powder was prepared by annealing the GO powder at 300 °C in nitrogen atmosphere. The GO and RGO solutions were prepared by dispersing the weighed GO and RGO powders into deionized water, respectively.
3：List of Experimental Equipment and Materials:
Fluorine doped tin oxide (FTO) substrates, isopropanol-KOH solution, ethanol, deionized water, UV ozone cleaning system, tube furnace filled with N2, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM, JEM-2100 F, JEOL), XploRA spectrometer, X-ray photoelectron spectroscopy (XPS) analysis (Kratos Axis Ultra Dld), electrochemical workstation (CHI660C Instruments).
4：Experimental Procedures and Operational Workflow:
The GO films were formed onto the FTO substrates by dipping the FTO substrate in the GO solution. The resultant GO films were first dried in a heat panel at 120 °C and then annealed at 300 °C for 1 h in a tube furnace filled with N2. The RGO2 films were prepared with the same procedures except that the GO solution is replaced with the RGO solution.
5：The RGO2 films were prepared with the same procedures except that the GO solution is replaced with the RGO solution.
Data Analysis Methods:
5. Data Analysis Methods: The electrocatalytic activity was evaluated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and Tafel polarization measurements. The photovoltaic performances of DSSCs were evaluated under the solar illumination of AM1.5 G simulated solar light.
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