Si/ZnO heterostructures for efficient diode and water-splitting applications

Mitta, Sekhar Babu; Murahari, Prashantha; Nandanapalli, Koteeswara Reddy; Devika, M.; Karuppannan, Ramesh; Whang, Dongmok

doi:10.1016/j.ijhydene.2018.07.038

Cited by 14 publications

(2 citation statements)

References 78 publications

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“…In particular, nanoparticles (NPs) made of ZnO, a wide band-gap semiconductor, are attracting a lot of attention due to their low-temperature synthesis, various morphologies, high crystallinity, good optical properties, and excellent electrical characteristics. ZnO has a broad range of applications in photocatalysis [ 3 ], photovoltaics [ 4 ], gas sensing [ 5 ], electronics (diodes), and water-splitting [ 6 ]. It has also received growing interest in the field of biochemical sensors [ 7 ] thanks to its outstanding sensitivity to chemical species.…”

Section: Introductionmentioning

confidence: 99%

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

et al. 2021

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Copper-doped zinc oxide nanoparticles (NPs) CuxZn1−xO (x = 0, 0.01, 0.02, 0.03, and 0.04) were synthesized via a sol-gel process and used as an active electrode material to fabricate a non-enzymatic electrochemical sensor for the detection of glucose. Their structure, composition, and chemical properties were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) and Raman spectroscopies, and zeta potential measurements. The electrochemical characterization of the sensors was studied using cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and differential pulse voltammetry (DPV). Cu doping was shown to improve the electrocatalytic activity for the oxidation of glucose, which resulted from the accelerated electron transfer and greatly improved electrochemical conductivity. The experimental conditions for the detection of glucose were optimized: a linear dependence between the glucose concentration and current intensity was established in the range from 1 nM to 100 μM with a limit of detection of 0.7 nM. The proposed sensor exhibited high selectivity for glucose in the presence of various interfering species. The developed sensor was also successfully tested for the detection of glucose in human serum samples.

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Section: Introductionmentioning

confidence: 99%

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

et al. 2021

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“…In recent years, the advanced oxidation method has been an up-and-coming method for the treatment of wastewater. 13) Semiconductor oxides are used as photocatalysts, and under the illumination of suitable radiation, electron-hole pairs are created through the photoelectric effect. 4,5) These electronhole pairs will participate in a series of redox reactions to generate reactive radicals such as ( + O 2¹ , HO 2+ ) to degrade pollutants.…”

Section: Introductionmentioning

confidence: 99%

The Roles of the CuO Buffer Layer on the Photocatalytic Activity of the p-Si/p-CuO/n-ZnO Composite Films

Lâm¹,

Thanh²,

Thien

et al. 2023

Mater. Trans.

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The photocatalytic activity of p-Si/p-CuO buffer layer/n-ZnO nanorod (NR) composite films was studied using experimental and simulation methods. The simulation results indicated that in the p-Si/p-CuO/n-ZnO composite film, the 250 nm CuO buffer layer contributes the highest value of 11% to the total current density compared to the p-Si/n-ZnO composite film. Besides that, the experimental results also indicated that by introducing the p-CuO buffer layer, the pseudo-order rate constant (k) could be enhanced up to 12% compared to the composite film without the p-CuO buffer layer -the p-Si/n-ZnO composite film. Furthermore, the recycle result indicated that the pseudo-order rate constant -k value decreased sharply after the first three reaction cycle times and gradually stabilized at a value of 0.88 s ¹1 after the fourth reaction cycle. Therefore, it can be concluded that by introducing the 250 nm thick of p-CuO buffer layer in the p-Si/p-CuO/n-ZnO NRs composite film, the photocatalytic activity could be improved up to 12% compared to that without the p-CuO buffer layer. In addition, the composite film, p-Si/p-CuO buffer layer/n-Zno, is a reusable photocatalyst with high photostability.

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Construction of Heterostructured Sn/TiO₂/Si Photocathode for Efficient Photoelectrochemical CO₂Reduction

Zhou

Zhang

et al. 2022

ChemSusChem

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Using renewable energy to convert CO2 into liquid products, as a sustainable way to produce fuels and chemicals, has attracted intense attention. Herein, a novel heterostructured photocathode composed of Si wafer, TiO2 layer, and Sn metal particles has been successfully fabricated by combining of a facile hydrothermal and electrodeposition method. The obtained Sn/TiO2/Si photocathode shows enhanced light absorption performance by the surface plasmon resonance effect of Sn metal. Especially, the Sn/TiO2/Si photocathode together with rich oxygen vacancy defects jointly promote photoelectrochemical CO2 reduction, harvesting a high faradaic efficiency of HCOOH and a desirable average current density (−4.72 mA cm−2) at −1.0 V vs. reversible hydrogen electrode. Significantly, the photocathode Sn/TiO2/Si also shows good stability due to the design of protecting layer TiO2. This study provides a facile strategy of constructing an efficient photocathode to improve the light absorption performance and the electron transfer efficiency, exhibiting great potential in the CO2 reduction.

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Si/ZnO heterostructures for efficient diode and water-splitting applications

Cited by 14 publications

References 78 publications

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

The Roles of the CuO Buffer Layer on the Photocatalytic Activity of the p-Si/p-CuO/n-ZnO Composite Films

Construction of Heterostructured Sn/TiO₂/Si Photocathode for Efficient Photoelectrochemical CO₂Reduction

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Si/ZnO heterostructures for efficient diode and water-splitting applications

Cited by 14 publications

References 78 publications

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

Cu-Doped ZnO Nanoparticles for Non-Enzymatic Glucose Sensing

The Roles of the CuO Buffer Layer on the Photocatalytic Activity of the p-Si/p-CuO/n-ZnO Composite Films

Construction of Heterostructured Sn/TiO2/Si Photocathode for Efficient Photoelectrochemical CO2Reduction

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Construction of Heterostructured Sn/TiO₂/Si Photocathode for Efficient Photoelectrochemical CO₂Reduction