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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Electrospun Black Titania Nanofibers: Influence of Hydrogen Plasma-Induced Disorder on the Electronic Structure and Photoelectrochemical Performance
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Electrospun Black Titania Nanofibers: Influence of Hydrogen Plasma-Induced Disorder on the Electronic Structure and Photoelectrochemical Performance

机译：黑色静电二氧化钛纳米纤维：氢等离子体诱导的紊乱对电子结构和光电化学性能的影响

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This work encompasses a facile method for tailoring surface defects in electrospun TiO2 nanofibers by employing hydrogen plasma treatments. This amiable processing method was proven with SQUID, EPR, and XPS to be highly effective in generating oxygen vacancies, accompanied by the reduction of Ti4+ centers to Ti3+, resulting in the formation of black titania. The treatment temperature was found to affect the Ti3+/Ti4+ ratios and surface valence, while preserving the original 1D morphology of the titania fibers. Ab initio DFT calculations showed that a high concentration of oxygen vacancies is highly efficient in producing midgap states that enhance the system absorption over the whole visible range, as observed with UV/vis/NIR diffuse reflectance spectroscopy. Pristine TiO2 nanofibers produced a photocurrent density of similar to 0.02 mA/cm(2) at 1.23 V vs RHE, whereas the hydrogen plasma treatment resulted in up to a 10-fold increase in the photoelectrochemical performance.
机译：这项工作包括一种通过采用氢等离子体处理来修饰电纺TiO2纳米纤维中表面缺陷的简便方法。 SQUID，EPR和XPS证明了这种友好的加工方法在产生氧空位方面非常有效，并且伴随着Ti4 +中心还原为Ti3 +，从而形成了黑色二氧化钛。发现处理温度会影响Ti3 + / Ti4 +的比例和表面化合价，同时保留二氧化钛纤维的原始一维形态。从头算DFT计算表明，如通过UV / vis / NIR漫反射光谱法观察到的，高浓度的氧空位在产生中间能隙状态时非常有效，该中间能隙状态可增强系统在整个可见范围内的吸收。原始的TiO2纳米纤维在1.23 V vs RHE下产生的光电流密度类似于0.02 mA / cm（2），而氢等离子体处理导致光电化学性能提高了10倍。

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