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Mahmoudi E, Asghari E, Delibaş N, Niaei A. Application of response surface methodology for optimization of the test condition of oxygen evolution reaction over La 0.8Ba 0.2CoO 3 perovskite-active carbon composite. Sci Rep 2023; 13:22878. [PMID: 38129452 PMCID: PMC10739840 DOI: 10.1038/s41598-023-49836-1] [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: 07/25/2023] [Accepted: 12/12/2023] [Indexed: 12/23/2023] Open
Abstract
The Experimental Design was applied to optimize the electrocatalytic activity of La0.8Ba0.2CoO3 perovskite oxide/Active Carbon composite material in the alkaline solution for the Oxygen Evolution Reaction. After the preparation of La0.8Ba0.2CoO3, and structural characterizations, the experimental design was utilized to determine the optimal amount of the composite material and testing conditions. The overpotential was defined as the response variable, and the mass ratio of perovskite/active carbon, Potassium hydroxide (KOH) concentration, and Poly(vinylidene fluoride) (PVDF) amount were considered effective parameters. The significance of model terms is demonstrated by P-values less than 0.0500. The proposed prediction model determined the optimal amounts of 0.665 mg of PVDF, a KOH concentration of 0.609 M, and A perovskite/Active Carbon mass ratio of 2.81 with 308.22 mV overpotential (2.27% greater than the actual overpotential). The stability test of the optimized electrode material over 24 h suggests that it could be a good candidate electrocatalyst for OER with reusability potential.
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Affiliation(s)
- Elham Mahmoudi
- Department of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, 5166616471, Iran
| | - Elnaz Asghari
- Department of Physical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz, Iran
| | - Nagihan Delibaş
- Department of Physics, Faculty of Art and Science, Sakarya University, Sakarya, Turkey
| | - Aligholi Niaei
- Department of Chemical and Petroleum Engineering, University of Tabriz, Tabriz, 5166616471, Iran.
- Department of Physics, Faculty of Art and Science, Sakarya University, Sakarya, Turkey.
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Khodabakhsh M, Yilmaz B, Firoozi S, Fatmehsari Haghshenas D, Unal U. Enhanced Photocatalytic Properties of Restacked Unilamellar [SrTa 2O 7] 2- Nanosheets of Aurivillius Phase Layered Perovskites. ACS OMEGA 2023; 8:10607-10617. [PMID: 36969431 PMCID: PMC10034980 DOI: 10.1021/acsomega.3c00593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
In the present work, unilamellar [SrTa2O7]2- perovskite nanosheets with variable lateral dimensions were synthesized via a high-yield, three-step liquid exfoliation route from layered Bi2SrTa2O9. The photocatalytic activity of the parent and exfoliated layered perovskites was evaluated for the photocatalytic dye degradation of Rhodamine B under UV light (254 nm) and reduction of water to H2 under the full solar spectrum. A comparative study of the photocatalytic behavior of unilamellar [SrTa2O7]2- perovskite nanosheets and parent layered structure showed a significant improvement in both hydrogen evolution (98.20 vs 3 μmol g-1) and Rhodamine B degradation time (180 vs 30 min), with the restacked nanosheets. The exfoliation of layered perovskites not only increases their specific surface area, providing more active sites, but also reduces the recombination probability of electrons and holes due to their unilamellar structure and reduced charge transport pathways. The synthesis and preparation of strong acid solids such as [SrTa2O7]2- perovskite nanosheets can be a promising approach for effective adsorption of pollutants with cationic nature and more efficient electron transfer between the dye and catalyst. Finally, the photocatalytic characteristics of the restacked unilamellar [SrTa2O7]2- nanosheets remained unchanged after three successive cycles of recycling-reusing.
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Affiliation(s)
| | - Bengisu Yilmaz
- Koc
University Tupras Energy Center (KUTEM), Koc University, Rumelifeneri
yolu, Sariyer, 34450 Istanbul, Turkey
- Materials
Science and Engineering Department, Koc
University, Rumelifeneri
yolu, Sariyer, 34450 Istanbul, Turkey
| | - Sadegh Firoozi
- Department
of Materials and Metallurgical Engineering, Amirkabir University of Technology, No. 350, Hafez Ave, Valiasr Square, 1591634311 Tehran, Iran
| | - Davoud Fatmehsari Haghshenas
- Department
of Materials and Metallurgical Engineering, Amirkabir University of Technology, No. 350, Hafez Ave, Valiasr Square, 1591634311 Tehran, Iran
| | - Ugur Unal
- Chemistry
Department, Koc University, Rumelifeneri yolu, Sariyer, 34450 Istanbul, Turkey
- Koc
University Surface Science and Technology Center (KUYTAM), Koc University, Rumelifeneri yolu, Sariyer, 34450 Istanbul, Turkey
- Koc
University Tupras Energy Center (KUTEM), Koc University, Rumelifeneri
yolu, Sariyer, 34450 Istanbul, Turkey
- Materials
Science and Engineering Department, Koc
University, Rumelifeneri
yolu, Sariyer, 34450 Istanbul, Turkey
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Molybdenum disulfide loading on a Z-scheme graphitic carbon nitride and lanthanum nickelate heterojunction for enhanced photocatalysis: Interfacial charge transfer and mechanistic insights. J Colloid Interface Sci 2022; 611:684-694. [PMID: 34974228 DOI: 10.1016/j.jcis.2021.12.106] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/10/2021] [Accepted: 12/16/2021] [Indexed: 12/11/2022]
Abstract
Interfacial design and the co-catalyst effect are considered to be effective to achieve separation and transport of photogenerated carriers in composite photocatalysts. In this study, a Z-scheme heterojunction was successfully combined with a co-catalyst to achieve a highly efficient LaNiO3/g-C3N4/MoS2 photocatalyst. MoS2 flakes were loaded on a hybrid material surface, which was formed by LaNiO3 nanocubes embedded on layered g-C3N4, and a good heterostructure with multiple attachment sites was obtained. Experimental studies confirmed that the Z-scheme heterojunction completely preserves the strong redox ability of the photogenerated electrons and holes. As a cocatalyst, MoS2 further promoted interfacial charge separation and transport. The synergistic effect of the Z-scheme heterojunction and co-catalyst effectively realized the transfer of photogenerated carriers from "slow transfer" to "high transfer" and promoted water decomposition and pollutant degradation. Results revealed that under simulated sunlight irradiation, LaNiO3/g-C3N4/MoS2 composites exhibit superior hydrogen evolution of 45.1 μmol h-1, which is 19.1 times that of g-C3N4 and 4.9 times that of LaNiO3/g-C3N4, respectively. Moreover, the LaNiO3/g-C3N4/MoS2 Z-scheme photocatalyst exhibited excellent photocatalytic performance for antibiotic degradation and heavy-metal ion reduction under visible light. This study might provide some insights into the development of photocatalysts for solar energy conversion and environmental remediation.
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