Scalable and inexpensive strategy to fabricate CuO/ZnO nanowire heterojunction for efficient photoinduced water splitting

Tsege, Ermias Libnedengel; Cho, Soo Kyung; Tufa, Lemma Teshome; Lee, Jaebeom; Kim, Hyung-Kook; Hwang, Yoon‐Hwae

doi:10.1007/s10853-017-1711-4

Cited by 17 publications

(5 citation statements)

References 26 publications

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Section: Photoelectrochemical Properties Of Cuo Compositesmentioning

confidence: 99%

“…Tsege et al. [ 223 ] fabricated CuO/ZnO nanowire heterojunction with an outstanding photocurrent density of 8.1 mA cm −2 at 0V versus RHE, which showed 13.6% enhancement, compared to that of pristine CuO NW. The schematic illustration of the synthetic procedure of the CuO/ZnO NW heterostructure film can be observed in Figure 6d.…”

Section: Photoelectrochemical Properties Of Cuo Compositesmentioning

confidence: 99%

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Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

et al. 2021

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The cost‐effective, robust, and efficient electrocatalysts for photoelectrochemical (PEC) water‐splitting has been extensively studied over the past decade to address a solution for the energy crisis. The interesting physicochemical properties of CuO have introduced this promising photocathodic material among the few photocatalysts with a narrow bandgap. This photocatalyst has a high activity for the PEC hydrogen evolution reaction (HER) under simulated sunlight irradiation. Here, the recent advancements of CuO‐based photoelectrodes, including undoped CuO, doped CuO, and CuO composites, in the PEC water‐splitting field, are comprehensively studied. Moreover, the synthesis methods, characterization, and fundamental factors of each classification are discussed in detail. Apart from the exclusive characteristics of CuO‐based photoelectrodes, the PEC properties of CuO/2D materials, as groups of the growing nanocomposites in photocurrent‐generating devices, are discussed in separate sections. Regarding the particular attention paid to the CuO heterostructure photocathodes, the PEC water splitting application is reviewed and the properties of each group such as electronic structures, defects, bandgap, and hierarchical structures are critically assessed.

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Section: Photoelectrochemical Properties Of Cuo Compositesmentioning

confidence: 99%

Section: Photoelectrochemical Properties Of Cuo Compositesmentioning

confidence: 99%

Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

et al. 2021

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“…To assess the potential of ZnO/CuO heterojunction with and without oxygen vacancy for photovoltaic applications, different configurations of the device have been considered for quantum efficiency calculations. [39,40] The different configurations of the devices with a channel length of 14.04 Å and Au as electrodes are shown in Figure 5a-d.…”

Section: Resultsmentioning

confidence: 99%

Interface Analysis of CuO/ZnO Heterojunction for Optoelectronic Applications: An Experimental and Simulation Study

Sumanth

Mishra

Rao

et al. 2023

Physica Status Solidi (a)

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Material interfaces are essential building blocks for a wide variety of emerging technologies. Particularly, well‐defined and optimized heterostructures serve as the foundation for developing materials for innovative optoelectronic applications. The distinctive features of heterojunctions has recently attracted the attention of the optoelectronics community, prompting a rise in the construction of modern devices. We present a solution‐based method for developing a heterojunction made of copper oxide nanorods coated with zinc oxide thin films. Coating ZnO thin films on vertically oriented CuO nanorods results in the development of a ZnO/CuO heterojunction configuration, which exhibits outstanding optoelectronic capabilities like broadband absorption, white light emission. Additionally, systematic ab‐initio computations have been done in order to comprehend the impact on various optical and electrical properties. It is observed that defects play a very crucial role in determining the quantum efficiency as well as improved visible to NIR absorption. Moreover, formation of energy levels near conduction bands in the presence of vacancies lead to broad absorption in the UV‐Visible region and therefore greater than 60% quantum efficiency over the range 390 nm to 800 nm is observed. Therefore, the presented work serves as the foundation for additional design and optimization techniques for oxide heterojunctions and emerging applications.This article is protected by copyright. All rights reserved.

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“…Further, the optical band gap for each of the synthesized samples was also estimated using the following Tauc’s relation ( α h v ) = A ( h v − E normalg ) n / 2 where v = incident photon frequency, h = Planck’s constant, α = the coefficient of absorption, A = proportional constant, n = the power index referring to the nature of the transition, and its value for direct transitions is 1. , By extrapolating the linear region of (α h ν) 2 versus the hv axis, as illustrated in Figure b, direct band gaps can be estimated. In this work, the band gap values of W–ZnO, ZnO(ext), ZC20(ext), and ZC50(ext) samples were estimated to be about 3.04, 3.17, 2.68, and 2.57 eV, respectively.…”

Section: Resultsmentioning

confidence: 99%

Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

Endeshaw,

Tufa,

Goddati

et al. 2023

ACS Omega

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The photodegradation of organic pollutants using metal oxidebased catalysts has drawn great attention as an effective method for wastewater treatment. In this study, zinc oxide nanoparticles (ZnO NPs) and zinc oxide/ copper oxide nanocomposites (ZnO/CuO NCs) were fabricated using the leaf extract of Croton macrostachyus as a nontoxic, natural reducing and stabilizing agent. The synthesized samples were characterized by employing X-ray diffraction, microscopic, spectroscopic, and electrochemical methods. The results confirmed the successful synthesis of ZnO NPs and ZnO/CuO NCs with well-defined crystalline structures and morphologies. The prepared samples were tested for the photodegradation of methylene blue (MB) dye under visible light irradiation. Compared to ZnO NPs, ZnO/CuO NCs showed greatly improved photocatalytic performances, particularly with the sample prepared with the 20 mol % Cu precursor (97.02%). The enhancement could be related to the formed p−n heterojunction, which can suppress the recombination of charge carriers and extend the photoresponsive range. A theoretical study of the photocatalytic activity of ZnO/CuO NCs against MB dye degradation was also conducted by using COMSOL Multiphysics software. The results of the simulation are in reasonable agreement with those of the experiment. This study contributes to the development of sustainable and effective photocatalytic materials that are suitable for application in environmental remediation, particularly in the treatment of wastewater.

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Scalable and inexpensive strategy to fabricate CuO/ZnO nanowire heterojunction for efficient photoinduced water splitting

Cited by 17 publications

References 26 publications

Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

Photoelectrochemical Water‐Splitting Using CuO‐Based Electrodes for Hydrogen Production: A Review

Interface Analysis of CuO/ZnO Heterojunction for Optoelectronic Applications: An Experimental and Simulation Study

Croton macrostachyus Leaf Extract-Mediated Green Synthesis of ZnO Nanoparticles and ZnO/CuO Nanocomposites for the Enhanced Photodegradation of Methylene Blue Dye with the COMSOL Simulation Model

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