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Highly efficient sustainable photocatalytic Z-scheme hydrogen production from an α-Fe2O3 engineered ZnCdS heterostructure
Journal of Catalysis ( IF 7.3 ) Pub Date : 2017-07-28 , DOI: 10.1016/j.jcat.2017.06.019
M. Imran , Ammar Bin Yousaf , Peter Kasak , Akif Zeb , Syed Javaid Zaidi

We present an α-Fe2O3/Zn0.4Cd0.6S heterostructure that shows visible light photocatalytic H2 production as high as 536.8 μmol h−1 with apparent quantum efficiency of 11.2% at 420 nm. The UV–vis diffuse reflectance spectra of as-synthesized α-Fe2O3/Zn0.4Cd0.6S heterostructure reveal efficient absorption in the visible region, which is a key factor in the enhanced catalytic activity. Moreover, the increase in charge separation efficiency of α-Fe2O3/Zn0.4Cd0.6S suggested by electrochemical impedance spectroscopy and photocurrent response also results in enhanced photocatalytic H2 production. The interface contact between α-Fe2O3 and Zn0.4Cd0.6S ascertained from HRTEM images promotes the recombination of photogenerated electrons from the conduction band of α-Fe2O3 and holes from the valence band of Zn0.4Cd0.6S, thus enhancing the utilization of solar light and increasing the efficiency. Our coupling approach to synthesizing an efficient Z-scheme photocatalyst provides insight into the design of further solar energy utilization photocatalysts.



中文翻译:

从高效光催化可持续Z-方案制氢的α-Fe 2个ö 3工程ZnCdS异质结构

我们提出了一个的α-Fe 2 ö 3 /锌0.40.6小号异质该节目可见光催化ħ 2生产高达536.8微摩尔ħ -1与在420nm处的11.2%的表观量子效率。紫外可见漫反射所合成的α-Fe的谱2 ö 3 /锌0.40.6 š异质结构揭示在可见光区,这是在增强的催化活性的关键因素有效的吸收。此外,增加的电荷分离效率的α-Fe 2 ö 3 /锌0.40.6电化学阻抗光谱法和光电流响应所建议的S也导致增强的光催化H 2产生。的α-Fe之间的界面接触2 ö 3和Zn 0.4 Cd的0.6期从HRTEM图像确定促进光生电子从的的α-Fe的导带中的重组2 ö 3选自Zn的价带和空穴0.40.6 S,从而提高了太阳光的利用率并提高了效率。我们用于合成高效Z方案光催化剂的耦合方法为进一步利用太阳能的光催化剂的设计提供了见识。

更新日期:2017-07-28
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