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首页> 外文期刊>Electroanalysis >Characterization of Nano-Titania Modified CdS /Polysulfide Electrolyte Interface by Utilizing Mott-Schottky and Electrochemical Impedance Spectroscopy
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Characterization of Nano-Titania Modified CdS /Polysulfide Electrolyte Interface by Utilizing Mott-Schottky and Electrochemical Impedance Spectroscopy

机译:利用Mott-Schottky和电化学阻抗谱表征纳米二氧化钛修饰的CdS /聚硫化物电解质界面

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摘要

Photoelectrochemical (PEC) H_2 generation is a green energy solution to upcoming energy crises. We have modified photo-unstable CdS thin film with TiO_2-nanoparticles. Semiconductor electrolyte interface (SEI) of modified CdS surface using Mott-Schottky (MS) analysis is used to evaluate the relative band edge positions and flat-band potential (V_(FB)). Effect of applied AC-frequency, electrolyte pH and electrode surface modification, on V_(FB) and carrier-concentration is studied. Modified photoanode shows high photocurrent and stability, than bare CdS photoanode. Improved performance of modified photoanode is attributed to the higher recombination lifetime of the charge carrier as deduced by electrochemical impedance spectroscopy.
机译:光电化学(PEC)H_2的产生是应对即将来临的能源危机的绿色能源解决方案。我们用TiO_2纳米粒子修饰了光不稳定的CdS薄膜。使用Mott-Schottky(MS)分析对CdS表面进行改性的半导体电解质界面(SEI)用于评估相对能带边缘位置和平坦能带电位(V_(FB))。研究了施加的交流频率,电解质的pH值和电极表面改性对V_(FB)和载流子浓度的影响。改性的光电阳极比裸露的CdS光电阳极显示出更高的光电流和稳定性。改性光电阳极的性能提高归因于电化学阻抗谱法推导的电荷载体的更高复合寿命。

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