研究目的
To synthesize polycrystalline NbON (Nb5+) by a thermal nitridation method using NH3 and O2, and to investigate its photoelectrochemical properties for solar water splitting.
研究成果
Polycrystalline NbON (Nb5+) with a baddeleyite structure was successfully synthesized using thermal NH3 nitridation of Nb2O5 films with O2 addition. The material shows potential for solar water splitting with a band gap of 2.16 eV and a photocurrent of 0.6 mA cm-2 at 1.2 V vs. RHE.
研究不足
The use of TCO substrates with large surface area and roughness may affect the optimal O2 concentration for NbON synthesis. The photocurrent of NbON is lower than that of some other oxynitrides, indicating a need for optimization of the photoanode structure for light absorption.
1：Experimental Design and Method Selection:
The synthesis of NbON involved thermal NH3 nitridation of Nb2O5 films with the addition of O2 to prevent Nb reduction. The relationship between O2 concentration and the crystal phase of the resulting samples was investigated.
2：Sample Selection and Data Sources:
Nb2O5 thin films deposited on sapphire substrates by sputtering were used as precursors.
3：List of Experimental Equipment and Materials:
An infrared lamp furnace (MILA-5000, ADVANCE RIKO, Inc.) was used for nitridation. NH3, N2, and O2 gases were used in the reaction.
4：Experimental Procedures and Operational Workflow:
Samples were heated to desired temperatures (600–750 °C) under reaction gas flow including NH3, N2, and O2, held for 60 min, then cooled under N2 flow.
5：Data Analysis Methods:
The crystal phases were analyzed using XRD (SmartLab, Rigaku). Absorption spectra were obtained using a spectrometer (V-670, JASCO). XPS (JPS-9010TR, JEOL) was used for surface element analysis.
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