研究目的
To design an efficient and stable photoelectrode structure for photoelectrochemical (PEC) water splitting by synthesizing a novel CuO/Al photocathode with an Al2O3 passivation layer to enhance photocurrent density and photocorrosion stability.
研究成果
The CuO/Al/Al2O3 photocathode demonstrates significantly improved photocurrent density and photocorrosion stability due to the synergistic effects of Al nanoparticles' LSPR and the Al2O3 passivation layer. This study presents a promising approach for enhancing the performance and durability of photoelectrodes in PEC water splitting applications.
研究不足
The study is limited by the potential oxidation of Al nanoparticles in air, which could affect their plasmonic properties. Additionally, the thickness of the Al2O3 passivation layer and its impact on the photocathode's performance were not extensively varied to explore optimal conditions.
1：Experimental Design and Method Selection:
The study involved the synthesis of a CuO/Al photocathode followed by the introduction of an Al2O3 passivation layer through spontaneous oxidation in air. The methodology aimed to leverage the localized surface plasmon resonance (LSPR) of Al nanoparticles and the protective properties of the Al2O3 layer.
2：Sample Selection and Data Sources:
Bare CuO and CuO/Al/Al2O3 photocathodes were prepared and characterized. Data on photocurrent density and photocorrosion stability were collected under simulated sunlight illumination.
3：List of Experimental Equipment and Materials:
Magnetron sputtering was used for depositing Al nanoparticles on CuO. UV-Vis diffuse reflectance spectroscopy, SEM, TEM, HRTEM, XRD, XPS, and electrochemical measurements were employed for characterization.
4：Experimental Procedures and Operational Workflow:
The CuO/Al photocathode was synthesized and then subjected to oxidation in air to form the Al2O3 passivation layer. PEC performance was evaluated through photocurrent density–voltage (J–V) curves and chronoamperometry.
5：Data Analysis Methods:
The enhancement in PEC performance was attributed to the LSPR effect of Al nanoparticles and the passivation effect of the Al2O3 layer, as evidenced by UV-Vis absorption spectra, SPV measurements, and EIS analysis.
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