Enhancing the photocatalytic performance of spin coated SrTiO3 and 0.6Ba(Zr0·2Ti0.8)O3-0.4(Ba0·7 Ca0.3)TiO3 heterostructure films via charge coupling effect

IF 4.3 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Journal of Physics and Chemistry of Solids Pub Date : 2025-04-04 DOI:10.1016/j.jpcs.2025.112750

M. Bhakyalatha , M. Tasneem , R. Soundarya , K.C. Sekhar , Koppole Kamakshi

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Abstract

In this work, the microstructure, optical, electrical and photocatalytic performance of SrTiO₃(STO) film and 0.6Ba(Zr_0·2Ti_0.8)O₃-0.4(Ba_0·7Ca_0.3)TiO₃(BCZT)-STO heterostructure are investigated in detail. XRD analysis confirms the cubic phase of STO and morphotropic phase (coexistence of both tetragonal and rhombohedral phases) of BCZT. The presence of resistive switching effect and current minima at non-zero bias confirms charge coupling effect in BCZT-STO heterostructure. The ratio of photocurrent to dark is found to be 3 times higher in heterostructure compared to STO film due to the charge coupling effect. The photocatalytic performance of STO and BCZT-STO are investigated with Rhodamine-B as a model dye. The STO photocatalyst showed an efficiency of 39 % after an irradiation time of 2 h due to its paraelectric nature. However, its efficiency is boosted to 77 % when it is integrated with ferroelectric BCZT layer due to high rate of reaction. The mechanism of photocatalytic activity is proposed based on the band alignment of heterostructure and charge coupling effect. The radical trapping experiments suggest that O₂⁻ significantly contributed to photocatalytic activity. Further, the heterostructure also showed good recyclability up to 5 cycles. The BCZT-STO heterostructures are also efficient for photodegradation of other coloured dyes like Rose Bengal dye with 75 % efficiency after 60 min of light irradiation and 100 % for ampicillin antibiotics after 20 min light irradiation. Thus, this work showed that an efficient and recyclable photocatalyst can be obtained through charge coupling effect in ferroelectric-wide gap semiconductor heterostructure.

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利用电荷耦合效应增强自旋包覆SrTiO3和0.6Ba(Zr0·2Ti0.8)O3-0.4(Ba0·7ca0.3)TiO3异质结构薄膜的光催化性能

本文详细研究了SrTiO3（STO）薄膜和0.6Ba(Zr0·2Ti0.8)O3-0.4(Ba0·7Ca0.3)TiO3(BCZT)-STO异质结构的微观结构、光学、电学和光催化性能。XRD分析证实了BCZT中存在STO的立方相和形貌相（四方相和菱形相共存）。电阻开关效应和非零偏置下电流最小值的存在证实了BCZT-STO异质结构中电荷耦合效应的存在。由于电荷耦合效应，光电流与暗比在异质结构中比STO薄膜高3倍。以罗丹明- b为模型染料，研究了STO和BCZT-STO的光催化性能。STO光催化剂的准电性使其在照射2 h后的效率达到39%。而与铁电BCZT层结合后，由于反应速率高，效率可提高到77%。基于异质结构的能带对准和电荷耦合效应，提出了光催化活性的机理。自由基捕获实验表明O2−对光催化活性有显著影响。此外，该异质结构具有良好的可循环性，循环次数可达5次。BCZT-STO异质结构也可以有效地光降解其他有色染料，如玫瑰孟加拉染料，光照60分钟后效率为75%，光照20分钟后氨苄西林抗生素效率为100%。因此，本工作表明，在铁电宽间隙半导体异质结构中，通过电荷耦合效应可以获得一种高效且可回收的光催化剂。

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来源期刊

Journal of Physics and Chemistry of Solids 工程技术-化学综合

CiteScore

7.80

自引率

2.50%

发文量

605

审稿时长

40 days

期刊介绍： The Journal of Physics and Chemistry of Solids is a well-established international medium for publication of archival research in condensed matter and materials sciences. Areas of interest broadly include experimental and theoretical research on electronic, magnetic, spectroscopic and structural properties as well as the statistical mechanics and thermodynamics of materials. The focus is on gaining physical and chemical insight into the properties and potential applications of condensed matter systems. Within the broad scope of the journal, beyond regular contributions, the editors have identified submissions in the following areas of physics and chemistry of solids to be of special current interest to the journal: Low-dimensional systems Exotic states of quantum electron matter including topological phases Energy conversion and storage Interfaces, nanoparticles and catalysts.