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• W2969157506 endingPage "151846" @default.
• W2969157506 startingPage "151846" @default.
• W2969157506 abstract "Tantalum (oxy) nitrides have been considered as very promising visible-light-driven photocatalysts for overall water splitting. The traditional tantalum (oxy) nitrides preparation using NH3 gas at high temperature (850-1150 °C) is not favored for the dangerous process and complexity. Furthermore, the undesirable defects (O impurities and N vacancies) in tantalum (oxy) nitrides reduce the photocatalytic activity. Herein, we developed a safer and simpler approach for controllable preparing high-efficient TaOxNy and Ta3N5 through vacuum nitriding using melamine as a nitrogen source. The effect of vacuum nitriding conditions on the microstructure, composition, photo-adsorption and photocatalytic H2 evolution of the samples were studied. TaOxNy and Ta3N5 can be obtained with the pressure below 2 × 104 Pa, temperature of 500–700 °C and holding time for 6 h. Compared to the samples synthesized by traditional NH3 nitriding, the as-prepared TaOxNy and Ta3N5 by vacuum nitriding exhibited enhanced photocatalytic H2 evolution owing to the lower defects, higher charger separation rate and higher specific surface area. Furthermore, according to the nitrogen potential theory, vacuum condition increased the nitrogen potential and promoted the collision of active nitrogen with the sample, which achieved more effective nitrogen replacement. This study contributes to the simple synthesis of high-efficient tantalum (oxy) nitrides with lower defects." @default.
• W2969157506 created "2019-08-22" @default.
• W2969157506 creator A5059445221 @default.
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• W2969157506 date "2019-11-01" @default.
• W2969157506 modified "2023-10-18" @default.
• W2969157506 title "Controllable synthesis of high-efficient TaOxNy and Ta3N5 photocatalysts through vacuum nitriding using melamine as a nitrogen source" @default.
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• W2969157506 doi "https://doi.org/10.1016/j.jallcom.2019.151846" @default.
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