کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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6455552 | 1419756 | 2017 | 8 صفحه PDF | دانلود رایگان |
- An α-Fe2O3 engineered ZnCdS heterostructure was synthesized.
- The photocatalyst was tested for Z-scheme water splitting.
- High charge separation efficiency and long-term stability were obtained.
- Interfacial contact between α-Fe2O3 and Zn0.4Cd0.6S enhanced performance.
We present an α-Fe2O3/Zn0.4Cd0.6S heterostructure that shows visible light photocatalytic H2 production as high as 536.8 μmol hâ1 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.
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Journal: Journal of Catalysis - Volume 353, September 2017, Pages 81-88