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首页> 外文期刊>RSC Advances >N-Doped and Cu-doped TiO2-B nanowires with enhanced photoelectrochemical activity
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N-Doped and Cu-doped TiO2-B nanowires with enhanced photoelectrochemical activity

机译：N掺杂和Cu掺杂的TiO2-B纳米线具有增强的光电化学活性

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摘要

TiO2-B is a metastable phase of titania with an interesting crystal structure and electrochemical properties. N-Doped and Cu-doped TiO2-B nanowires (NWs) were synthesized by hydrothermal and microwave-assisted hydrothermal methods, respectively. All the NWs are single crystal with the same crystal orientation regardless of the synthesis method and doping situation. The doped NWs together with their corresponding pristine NWs were fabricated into a photoelectrochemical (PEC) anode for water oxidation and their photoactivity performances were studied and compared under different illumination wavelength ranges. The Cu-doped TiO2-B NWs exhibited a significantly higher photocurrent density than all the other samples under direct Xe lamp illumination; while their performance rapidly dropped below the hydrothermal NWs when the UV illumination was cut off. On the contrary, N-doped TiO2-B NWs exhibited significantly enhanced photoactivity particularly in the visible light range. X-ray photoelectron spectroscopy revealed that N-doping could narrow the electronic bandgap of TiO2, while the Cu-doping had little impact on the bandgap but rather improved the electrical conductivity. This research provides a new insight into elemental and phase control of TiO2-based solar energy harvesters.
机译：TiO2-B是二氧化钛的亚稳态相，具​​有有趣的晶体结构和电化学性能。分别通过水热法和微波辅助水热法合成了N掺杂和Cu掺杂的TiO2-B纳米线。无论合成方法和掺杂情况如何，所有NW都是具有相同晶体取向的单晶。将掺杂的NW及其相应的原始NW制成用于水氧化的光电化学（PEC）阳极，并研究和比较了它们在不同照射波长范围内的光活性。在直接氙灯照射下，掺杂铜的TiO2-B NWs的光电流密度明显高于所有其他样品。而当紫外线照射被切断时，它们的性能迅速下降到热液西北部以下。相反，N掺杂的TiO2-B NW表现出显着增强的光活性，特别是在可见光范围内。 X射线光电子能谱分析表明，N掺杂可以使TiO2的电子带隙变窄，而Cu掺杂对带隙的影响很小，反而提高了电导率。这项研究为基于TiO2的太阳能收集器的元素和相控制提供了新的见识。

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