研究目的
To study the evolution of the triple semiconductor/dye/electrolyte interface upon electrochemical polarization in dark conditions, specifically focusing on adsorption dynamics and possible degradative phenomena using EryB-sensitized NiO electrodes and the I3?/I? redox couple.
研究成果
EryB sensitization promotes redox processes and inhibits recombination in NiO-based electrodes. Electrochemical treatments affect adsorption dynamics, with oxidative polarization increasing triiodide adsorption and reductive polarization removing adsorbed species. The combined approach provides insights into interface evolution in DSCs.
研究不足
The study is ex situ, which may not fully capture real-time dynamics. The use of specific dyes and redox couples limits generalizability. Potential surface contamination during sample handling could affect results.
1：Experimental Design and Method Selection:
The study involved preparing mesoporous NiO films via screen printing on FTO electrodes, sensitizing with EryB dye, and using a three-electrode cell for electrochemical characterization under dark conditions to simulate DSC environments. XPS was used for ex situ spectroscopic analysis.
2：Sample Selection and Data Sources:
Samples included freshly sensitized NiO films (NiO/EryB), films dipped in electrolyte (NiO/EryB/sol), and films after various electrochemical treatments (CV 1, CV 50, Ox, Red). Electrolyte was 1 M LiI and 0.1 M I2 in acetonitrile.
3：1 M I2 in acetonitrile.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment included a potentiostat/galvanostat (Autolab PGSTAT 128N), XPS system (Omicron NanoTechnology MXPS with DAR 400 anode and EA-127 analyzer), and SEM (Zeiss Auriga 405). Materials included NiO, FTO glass, EryB dye, LiI, I2, acetonitrile, ethanol, silver paste, and adhesive tape.
4：5). Materials included NiO, FTO glass, EryB dye, LiI, I2, acetonitrile, ethanol, silver paste, and adhesive tape.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: NiO films were screen-printed, sensitized by dipping in EryB solution, rinsed, and used as working electrodes. Electrochemical treatments included cyclic voltammetry (1 and 50 scans at 0.02 V/s from -0.27 to 1.13 V vs Ag/AgCl), chronoamperometry at 0.9 V for 8000 s (Ox sample), and at -0.27 V for 8000 s (Red sample). After treatments, samples were rinsed, dried, and analyzed with XPS.
5：02 V/s from -27 to 13 V vs Ag/AgCl), chronoamperometry at 9 V for 8000 s (Ox sample), and at -27 V for 8000 s (Red sample). After treatments, samples were rinsed, dried, and analyzed with XPS.
Data Analysis Methods:
5. Data Analysis Methods: Electrochemical data were analyzed using NOVA 1.9 software. XPS spectra were fitted with pseudo-Voigt functions, and atomic ratios were calculated using Scofield cross-sections. SEM was used for morphological investigation.
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