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Huang X, Perera IP, Shubhashish S, Suib SL. Unveiling Enhanced PEC Water Oxidation: Morphology Tuning and Interfacial Phase Change in α-Fe 2O 3@K-OMS-2 Branched Core-Shell Nanoarrays. ACS APPLIED MATERIALS & INTERFACES 2024. [PMID: 38691761 DOI: 10.1021/acsami.4c03164] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2024]
Abstract
A simple fabrication method that involves two steps of hydrothermal reaction has been demonstrated for the growth of α-Fe2O3@K-OMS-2 branched core-shell nanoarrays. Different reactant concentrations in the shell-forming step led to different morphologies in the resultant composites, denoted as 0.25 OC, 0.5 OC, and 1.0 OC. Both 0.25 OC and 0.5 OC formed perfect branched core-shell structures, with 0.5 OC possessing longer branches, which were observed by SEM and TEM. The core K-OMS-2 and shell α-Fe2O3 were confirmed by grazing incidence X-ray diffraction (GIXRD), EDS mapping, and atomic alignment from high-resolution STEM images. Further investigation with high-resolution HAADF-STEM, EELS, and XPS indicated the existence of an ultrathin layer of Mn3O4 sandwiched at the interface. All composite materials offered greatly enhanced photocurrent density at 1.23 VRHE, compared to the pristine Fe2O3 photoanode (0.33 mA/cm2), and sample 0.5 OC showed the highest photocurrent density of 2.81 mA/cm2. Photoelectrochemical (PEC) performance was evaluated for the samples by conducting linear sweep voltammetry (LSV), applied bias photo-to-current efficiency (ABPE), electrochemical impedance spectroscopy (EIS), incident-photo-to-current efficiency (IPCE), transient photocurrent responses, and stability tests. The charge separation and transfer efficiencies, together with the electrochemically active surface area, were also investigated. The significant enhancement in sample 0.5 OC is ascribed to the synergetic effect brought by the longer branches in the core-shell structure, the conductive K-OMS-2 core, and the formation of the Mn3O4 thin layer formed between the core and shell.
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Affiliation(s)
- Xueni Huang
- Department of Chemistry, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, Connecticut 06269, United States
| | - Inosh P Perera
- Department of Chemistry, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, Connecticut 06269, United States
| | - Shubhashish Shubhashish
- Department of Chemistry, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, Connecticut 06269, United States
| | - Steven L Suib
- Department of Chemistry, University of Connecticut, U-3060, 55 North Eagleville Rd., Storrs, Connecticut 06269, United States
- Institute of Materials Science, University of Connecticut, 97 North Eagleville Rd., Storrs, Connecticut 06269, United States
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Ghafoor F, Kim H, Ghafoor B, Rehman S, Asghar Khan M, Aziz J, Rabeel M, Faheem Maqsood M, Dastgeer G, Lee MJ, Farooq Khan M, Kim DK. Interface engineering in ZnO/CdO hybrid nanocomposites to enhanced resistive switching memory for neuromorphic computing. J Colloid Interface Sci 2024; 659:1-10. [PMID: 38157721 DOI: 10.1016/j.jcis.2023.12.084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 11/29/2023] [Accepted: 12/13/2023] [Indexed: 01/03/2024]
Abstract
Resistive random-access memory (RRAMs) has attracted significant interest for their potential applications in embedded storage and neuromorphic computing. Materials based on metal chalcogenides have emerged as promising candidates for the fulfilment of these requirements. Due to its ability to manipulate electronic states and control trap states through controlled compositional dynamics, metal chalcogenide RRAM has excellent non-volatile resistive memory properties. In the present we have synthesized ZnO-CdO hybrid nanocomposite by using hydrothermal method as an active layer. The Ag/C15ZO/Pt hybrid nanocomposite structure memristors showed electrical properties similar to biological synapses. The device exhibited remarkably stable resistive switching properties that have a low SET/RESET (0.41/-0.2) voltage, a high RON/OFF ratio of approximately 105, a high retention stability, excellent endurance reliability up to 104 cycles and multilevel device storage performance by controlling the compliance current. Furthermore, they exhibited an impressive performance in terms of emulating biological synaptic functions, which include long-term potentiation (LTP), long-term depression (LTD), and paired-pulse facilitation (PPF), via the continuous modulation of conductance. The hybrid nanocomposite memristors notably achieved an impressive recognition accuracy of up to 92.6 % for handwritten digit recognition under artificial neural network (ANN). This study shows that hybrid-nanocomposite memristor performance could lead to efficient future neuromorphic architectures.
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Affiliation(s)
- Faisal Ghafoor
- Department of Electrical Engineering and Convergence Engineering for Intelligent Drone, Sejong University, Seoul 05006, Republic of Korea
| | - Honggyun Kim
- Department of Semiconductor Systems Engineering, Sejong University, Seoul 05006, Republic of Korea
| | - Bilal Ghafoor
- PPGE3M, Federal University of Rio Grande do Sul, Porto Alegre /RS, Brazil
| | - Shania Rehman
- Department of Semiconductor Systems Engineering, Sejong University, Seoul 05006, Republic of Korea
| | | | - Jamal Aziz
- Chair of Smart Sensor Systems, University of Wuppertal, Wuppertal, Germany
| | - Muhammad Rabeel
- Department of Electrical Engineering and Convergence Engineering for Intelligent Drone, Sejong University, Seoul 05006, Republic of Korea
| | - Muhammad Faheem Maqsood
- Department of Nanotechnology and Advanced Materials Engineering, Sejong University, 05006 Seoul, Republic of Korea
| | - Ghulam Dastgeer
- Department of Physics and Astronomy, Sejong University, Seoul 05006, Korea
| | - Myoung-Jae Lee
- Institute of Conversion Daegu Gyeongbuk Institute of Science and Technology (DGIST)., Daegu 42988, Republic of Korea.
| | - Muhammad Farooq Khan
- Department of Electrical Engineering and Convergence Engineering for Intelligent Drone, Sejong University, Seoul 05006, Republic of Korea.
| | - Deok-Kee Kim
- Department of Electrical Engineering and Convergence Engineering for Intelligent Drone, Sejong University, Seoul 05006, Republic of Korea; Department of Semiconductor Systems Engineering, Sejong University, Seoul 05006, Republic of Korea.
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Kumar S Kumar S, Kaushik RD, Purohit LP. ZnO-CdO nanocomposites incorporated with graphene oxide nanosheets for efficient photocatalytic degradation of bisphenol A, thymol blue and ciprofloxacin. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127332. [PMID: 34607025 DOI: 10.1016/j.jhazmat.2021.127332] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/01/2021] [Revised: 09/11/2021] [Accepted: 09/21/2021] [Indexed: 05/27/2023]
Abstract
The widespread existence of different organic contaminants mostly phenolic compounds, organic dyes and antibiotics in water bodies initiated by the various industrial wastes that raised great scientific concern and public awareness as well recently owing to their prospective capability to spread these contaminants resistant gene and pose hazard to human. In the present study, a series of nanostructured ZnO-CdO incorporated with reduced graphene oxide (ZCG nanocomposites) were successfully synthesized by a simple refluxing method and characterized by using the X-ray diffraction (XRD), Raman spectroscopy, FT-IR spectroscopy, photoluminescence spectroscopy, field emission-scanning microscope (FE-SEM) and UV-visible diffused reflectance spectroscopy (DRS) for the photocatalytic degradation of bisphenol A (BPA), thymol blue (ThB) and ciprofloxacin (CFn) with illumination of UV light. The maximum degradation and mineralization of BPA, ThB and CFn was achieved around 98.5%, 98.38% and 99.28% over the ZCG-5 nanocomposite photocatalyst after UV light irradiation for 180 min, 120 min and 75 min, respectively. The superior photocatalytic activity of ZCG-5 ascribed to enhance adsorption capacity, effective separation of charge carriers consequential for the production of more ROS after incorporation of RGO nanosheets with ZnO-CdO in photocatalyst. The conceivable photocatalytic degradation mechanism of BPA, ThB and CFn was elucidated through ROS identification and the assessment of photocatalyst stability by reusability, EEO (kwh/m3order) and UV light dose (mJ/cm2) were evaluated. The plausible photocatalytic degradation pathways were proposed for the degradation of BPA, ThB and CFn via GC-MS analysis. The present work investigates the efficient removal of BPA, ThB and CFn using ZCG nanocomposites as photocatalyst.
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Affiliation(s)
- Sonu Kumar S Kumar
- Department of Chemistry, Gurukula Kangri (Deemed University), Haridwar, India
| | - R D Kaushik
- Department of Chemistry, Gurukula Kangri (Deemed University), Haridwar, India
| | - L P Purohit
- Department of Physics, Gurukula Kangri (Deemed University), Haridwar, India.
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Li Y, Zhao D, Shi Y, Sun Z, Liu R. Role of Co in the Electrocatalytic Activity of Monolayer Ternary NiFeCo-Double Hydroxide Nanosheets for Oxygen Evolution Reaction. MATERIALS 2021; 14:ma14010207. [PMID: 33406720 PMCID: PMC7795402 DOI: 10.3390/ma14010207] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 12/07/2020] [Accepted: 12/14/2020] [Indexed: 02/06/2023]
Abstract
Monolayer nanosheets have gained significant attention as functional materials and also in photo/electrocatalysis due to their unique physical/chemical properties, abundance of highly exposed coordination sites, edges, and corner sites, motivating the pursuit of highly active monolayer nanosheets. NiFe-based layered double hydroxide (NiFe-LDH) nanosheets have been regarded as the most efficient electrocatalysis for oxygen evolution. However, the limited catalytic active site and the stacking layer limited the performance. Therefore, by introducing highly electroactive Co ions into monolayer NiFe-LDH, the obtained ternary NiFeCo-LDH monolayer structure possessed an increased concentration of defect (oxygen and metal vacancies), providing enough unsaturated coordination sites, benefitting the electrocatalytic water oxidation, as also explained by the density functional theory (DFT). This work reported an efficient strategy for the synthesis of ternary monolayer LDH in the application of energy conversion and storage.
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Affiliation(s)
- Ye Li
- Beijing Institute of Graphic Communication, School of New Media, Beijing 102600, China;
| | - Dan Zhao
- Beijing Institute of Graphic Communication, School of Printing and Packaging Engineering, Beijing 102600, China; (D.Z.); (Y.S.); (Z.S.)
| | - Yue Shi
- Beijing Institute of Graphic Communication, School of Printing and Packaging Engineering, Beijing 102600, China; (D.Z.); (Y.S.); (Z.S.)
| | - Zhicheng Sun
- Beijing Institute of Graphic Communication, School of Printing and Packaging Engineering, Beijing 102600, China; (D.Z.); (Y.S.); (Z.S.)
| | - Ruping Liu
- Beijing Institute of Graphic Communication, School of Printing and Packaging Engineering, Beijing 102600, China; (D.Z.); (Y.S.); (Z.S.)
- Correspondence: ; Tel.: +86-010-6026-1603
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Al-Rawashdeh NAF, Allabadi O, Aljarrah MT. Photocatalytic Activity of Graphene Oxide/Zinc Oxide Nanocomposites with Embedded Metal Nanoparticles for the Degradation of Organic Dyes. ACS OMEGA 2020; 5:28046-28055. [PMID: 33163787 PMCID: PMC7643185 DOI: 10.1021/acsomega.0c03608] [Citation(s) in RCA: 34] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2020] [Accepted: 10/09/2020] [Indexed: 05/14/2023]
Abstract
Nanocomposite materials based on metal nanoparticles and graphene oxide (GO) have gained increasing attention for their wide range of potential applications in various materials science fields. In this study, an efficient photocatalyst based on GO/ZnO nanocomposites with embedded metal nanoparticles was successfully synthesized via a simple one-pot method. The synthesized nanocomposites were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier transform infrared (FTIR) spectroscopy. The photocatalytic activity of the synthesized nanocomposites was tested in the degradation of methylene blue (MB) dyes, as a model of water pollutants. A catalytic activity of 84% was achieved using a nanocomposite with a percentage of 3.125% GO, after 90 min sunlight irradiation. Furthermore, embedded copper and silver nanoparticles were used as dopants to study their effects on the activity of the photocatalyst. The GO-ZnO-Cu nanocomposite showed that the activity toward MB degradation was decreased by 50%, while a significant increase in the activity of MB degradation was achieved by the GO-ZnO-Ag nanocomposite. The removal efficiency of MB by the GO-ZnO-Ag nanocomposite reached 100% after 40 min of sunlight irradiation. Thus, the GO-ZnO-Ag nanocomposite has the potential to be an efficient adaptable photocatalyst for the photodegradation of organic dyes in industrial wastewater.
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Affiliation(s)
| | - Odai Allabadi
- Chemistry
Department, Jordan University of Science
& Technology, Irbid 22110, Jordan
| | - Mohannad T. Aljarrah
- Department
of Chemical Engineering, Jordan University
of Science & Technology, Irbid 22110, Jordan
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Liang YC, Zhao WC. Morphology-dependent photocatalytic and gas-sensing functions of three-dimensional TiO2–ZnO nanoarchitectures. CrystEngComm 2020. [DOI: 10.1039/d0ce01036g] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Nanocomposites consisting of three-dimensional ZnO nanorods-decorated TiO2 nanorod templates (TiO2–ZnO) have been prepared by combining sputtering and hydrothermal growth strategies.
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Affiliation(s)
- Yuan-Chang Liang
- Department of Optoelectronics and Materials Technology
- National Taiwan Ocean University
- Taiwan
| | - Wei-Cheng Zhao
- Department of Optoelectronics and Materials Technology
- National Taiwan Ocean University
- Taiwan
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