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Ozgur C, Erdil T, Geyikci U, Okuyucu C, Lokcu E, Kalay YE, Toparli C. Engineering Oxygen Vacancies in (FeCrCoMnZn) 3O 4-δ High Entropy Spinel Oxides Through Altering Fabrication Atmosphere for High-Performance Rechargeable Zinc-Air Batteries. GLOBAL CHALLENGES (HOBOKEN, NJ) 2024; 8:2300199. [PMID: 38223889 PMCID: PMC10784197 DOI: 10.1002/gch2.202300199] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 11/03/2023] [Indexed: 01/16/2024]
Abstract
High entropy oxides (HEOs) offer great potential as catalysts for oxygen electrocatalytic reactions in alkaline environments. Herein, a novel synthesis approach to prepare (FeCrCoMnZn)3O4-δ high entropy spinel oxide in a vacuum atmosphere, with the primary objective of introducing oxygen vacancies into the crystal structure, is presented. As compared to the air-synthesized counterpart, the (FeCrCoMnZn)3O4-δ with abundant oxygen vacancies demonstrates a low (better) bifunctional (BI) index of 0.89 V in alkaline media, indicating enhanced electrocatalytic oxygen catalytic activity. Importantly, (FeCrCoMnZn)3O4-δ demonstrates outstanding long-term electrochemical and structural stability. When utilized as electrocatalysts in the air cathode of Zn-air batteries, the vacuum atmosphere synthesized (FeCrCoMnZn)3O4-δ catalysts outperform the samples treated in an air atmosphere, displaying superior peak power density, specific capacity, and cycling stability. These findings provide compelling evidence that manipulating the synthesis atmosphere of multi-component oxides can serve as a novel approach to tailor their electrochemical performance.
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Affiliation(s)
- Cagla Ozgur
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
| | - Tuncay Erdil
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
| | - Uygar Geyikci
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
| | - Can Okuyucu
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
| | - Ersu Lokcu
- Department of Metallurgical and Materials EngineeringEskisehir Osmangazi UniversityEskisehir26040Turkey
| | - Yunus Eren Kalay
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
| | - Cigdem Toparli
- Department of Metallurgical and Materials EngineeringMiddle East Technical UniversityAnkara06800Turkey
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Khellaf N, Kahoul A, Naamoune F, Cheriti M. Impact of the Synthesis Method on Electrochemical Performance of La0.5Sr0.5MnO3 Perovskite Oxide as a Cathode Material in Alkaline Fuel Cells. RUSS J ELECTROCHEM+ 2022. [DOI: 10.1134/s1023193522010062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Graphene Nanosheet-Wrapped Mesoporous La 0.8Ce 0.2Fe 0.5Mn 0.5O 3 Perovskite Oxide Composite for Improved Oxygen Reaction Electro-Kinetics and Li-O 2 Battery Application. NANOMATERIALS 2021; 11:nano11041025. [PMID: 33923729 PMCID: PMC8072543 DOI: 10.3390/nano11041025] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/12/2021] [Accepted: 04/12/2021] [Indexed: 11/21/2022]
Abstract
A novel design and synthesis methodology is the most important consideration in the development of a superior electrocatalyst for improving the kinetics of oxygen electrode reactions, such as the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER) in Li-O2 battery application. Herein, we demonstrate a glycine-assisted hydrothermal and probe sonication method for the synthesis of a mesoporous spherical La0.8Ce0.2Fe0.5Mn0.5O3 perovskite particle and embedded graphene nanosheet (LCFM(8255)-gly/GNS) composite and evaluate its bifunctional ORR/OER kinetics in Li-O2 battery application. The physicochemical characterization confirms that the as-formed LCFM(8255)-gly perovskite catalyst has a highly crystalline structure and mesoporous morphology with a large specific surface area. The LCFM(8255)-gly/GNS composite hybrid structure exhibits an improved onset potential and high current density toward ORR/OER in both aqueous and non-aqueous electrolytes. The LCFM(8255)-gly/GNS composite cathode (ca. 8475 mAh g−1) delivers a higher discharge capacity than the La0.5Ce0.5Fe0.5Mn0.5O3-gly/GNS cathode (ca. 5796 mAh g−1) in a Li-O2 battery at a current density of 100 mA g−1. Our results revealed that the composite’s high electrochemical activity comes from the synergism of highly abundant oxygen vacancies and redox-active sites due to the Ce and Fe dopant in LaMnO3 and the excellent charge transfer characteristics of the graphene materials. The as-developed cathode catalyst performed appreciable cycle stability up to 55 cycles at a limited capacity of 1000 mAh g−1 based on conventional glass fiber separators.
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Sahare S, Ghoderao P, Khan SB, Chan Y, Lee SL. Recent progress in hybrid perovskite solar cells through scanning tunneling microscopy and spectroscopy. NANOSCALE 2020; 12:15970-15992. [PMID: 32761037 DOI: 10.1039/d0nr03499a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Currently, sustainable renewable energy sources are urgently required to fulfill the cumulative energy needs of the world's 7.8 billion population, since the conventional coal and fossil fuels will be exhausted soon. Photovoltaic devices are a direct and efficient means to produce a huge amount of energy to meet these energy targets. In particular, hybrid-perovskite-based photovoltaic devices merit special attention not only due to their exceptional efficiency for generating appreciable energy but also their tunable band gaps and the ease of device fabrication. However, the commercialization of such devices suffers from the instability of the compositional materials. The cause of instability is the perovskite's structure and its morphology at the sub-molecular level; thereby revealing and eliminating these instabilities are a striking challenge. To address this issue, scanning tunneling microscopy/spectroscopy (STM/STS) presents a comprehensive method to allow the visualization of the morphology and electronic structure of materials at atomic-level resolution. Here, we review the recent developments of perovskite-based solar cells (PSCs), the STM/STS analysis of photoactive halide/hybrid and oxide materials, and the real-time STM/STS investigation of electronic structures with defects and traps that are believed to mainly affect device performances. The detailed STM/STS analysis can facilitate a better understanding of the properties of materials at the nanoscale. This informative study may hold great promise to advance the development of stable PSCs under atmospheric conditions.
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Affiliation(s)
- Sanjay Sahare
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China. and Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronics Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 China
| | - Prachi Ghoderao
- Department of Applied Physics, Defence Institute of Advanced Technology, Pune, 411025 India
| | - Sadaf Bashir Khan
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China. and Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronics Engineering, Shenzhen University, Shenzhen, Guangdong, 518060 China
| | - Yue Chan
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China.
| | - Shern-Long Lee
- Institute for Advanced Study, Shenzhen University, Shenzhen, Guangdong, 518060 China.
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Li Q, Guo M, Wang K, Wei Z, Du G, Zhang G, Chen N. LaSr2Mn2O7 Ruddlesden-Popper manganites for oxygen reduction and electrochemical capacitors. J RARE EARTH 2020. [DOI: 10.1016/j.jre.2019.07.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Xu J, Chen C, Han Z, Yang Y, Li J, Deng Q. Recent Advances in Oxygen Electrocatalysts Based on Perovskite Oxides. NANOMATERIALS 2019; 9:nano9081161. [PMID: 31416200 PMCID: PMC6724126 DOI: 10.3390/nano9081161] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 08/07/2019] [Accepted: 08/12/2019] [Indexed: 12/15/2022]
Abstract
Electrochemical oxygen reduction and oxygen evolution are two key processes that limit the efficiency of important energy conversion devices such as metal–air battery and electrolysis. Perovskite oxides are receiving discernable attention as potential bifunctional oxygen electrocatalysts to replace precious metals because of their low cost, good activity, and versatility. In this review, we provide a brief summary on the fundamentals of perovskite oxygen electrocatalysts and a detailed discussion on emerging high-performance oxygen electrocatalysts based on perovskite, which include perovskite with a controlled composition, perovskite with high surface area, and perovskite composites. Challenges and outlooks in the further development of perovskite oxygen electrocatalysts are also presented.
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Affiliation(s)
- Jun Xu
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Chan Chen
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Zhifei Han
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
| | - Yuanyuan Yang
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China
| | - Junsheng Li
- Department of Chemistry, School of Chemistry, Chemical Engineering and Life Sciences, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
- Hubei Provincial Key Laboratory of Fuel Cell, Wuhan University of Technology, 122 Luoshi Road, Wuhan 430070, China.
| | - Qibo Deng
- School of Materials Science and Engineering, Tianjin University of Technology, Tianjin 300384, China
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Liu S, Liu L, Chen X, Yang Z, Li M, Wang Y, Lv W, Zhu P, Zhao X, Wang G. On an Easy Way to Prepare Fe, S, N Tri-Doped Mesoporous Carbon Materials as Efficient Electrocatalysts for Oxygen Reduction Reaction. Electrocatalysis (N Y) 2018. [DOI: 10.1007/s12678-018-0496-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Bai L, Li M, Guan J. Co(II) or Cu(II) Schiff Base Complex Immobilized onto Carbon Nanotubes as a Synergistic Catalyst for the Oxygen Reduction Reaction. ChemistrySelect 2018. [DOI: 10.1002/slct.201702801] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Lu Bai
- College of Chemistry; Jilin University; Changchun 130023 P.R. China
| | - Min Li
- College of Chemistry; Jilin University; Changchun 130023 P.R. China
| | - Jingqi Guan
- College of Chemistry; Jilin University; Changchun 130023 P.R. China
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