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Zhang H, Zhang F, Li A, Zhao B, Li D, Liu Y, Yang Y, Li F, Liu R, Wei Y. Controllable synthesis of Na, K-based titanium oxide nanoribbons as functional electrodes for supercapacitors and separation of aqueous ions. NEW J CHEM 2022. [DOI: 10.1039/d1nj05811h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By facile controllable preparation, as-synthesized NTO and KTO exhibit remarkable electrochemical behavior for the applications of supercapacitors and capacitive deionization.
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Affiliation(s)
- Hao Zhang
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, P. R. China
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Fang Zhang
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Aiyang Li
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
- Environmental Standard Institute, Ministry of Ecology and Environment, Beijing 100012, P. R. China
| | - Bin Zhao
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
- Institute of Eco-environmental and Soil Sciences, Guangdong Academy of Sciences, Guangzhou 510650, P. R. China
| | - Danni Li
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Yifei Liu
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, P. R. China
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Yang Yang
- Technical Centre for Soil, Agriculture and Rural Ecology and Environment, Ministry of Ecology and Environment, Beijing 100012, P. R. China
| | - Fangzhou Li
- School of Environment, Tsinghua University, Beijing 100084, P. R. China
| | - Rui Liu
- Beijing Key Laboratory of Biodiversity and Organic Farming, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P. R. China
| | - Yuquan Wei
- Beijing Key Laboratory of Biodiversity and Organic Farming, College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, P. R. China
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Lee C, Kim SK, Chang H, Jang HD. K 2Ti 6O 13 Nanoparticle-Loaded Porous rGO Crumples for Supercapacitors. NANO-MICRO LETTERS 2019; 12:10. [PMID: 34138076 PMCID: PMC7770654 DOI: 10.1007/s40820-019-0344-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Accepted: 11/20/2019] [Indexed: 06/12/2023]
Abstract
One-dimensional alkali metal titanates containing potassium, sodium, and lithium are of great concern owing to their high ion mobility and high specific surface area. When those titanates are combined with conductive materials such as graphene, carbon nanotube, and carbon nanofiber, they are able to be employed as efficient electrode materials for supercapacitors. Potassium hexa-titanate (K2Ti6O13, KTO), in particular, has shown superior electrochemical properties compared to other alkali metal titanates because of their large lattice parameters induced by the large radius of potassium ions. Here, we present porous rGO crumples (PGC) decorated with KTO nanoparticles (NPs) for application to supercapacitors. The KTO NP/PGC composites were synthesized by aerosol spray pyrolysis and post-heat treatment. KTO NPs less than 10 nm in diameter were loaded onto PGCs ranging from 3 to 5 µm. Enhanced porous structure of the composites was obtained by the activation of rGO by adding an excessive amount of KOH to the composites. The KTO NP/PGC composite electrodes fabricated at the GO/KOH/TiO2 ratio of 1:3:0.25 showed the highest performance (275 F g-1) in capacitance with different KOH concentrations and cycling stability (83%) after 2000 cycles at a current density of 1 A g-1.
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Affiliation(s)
- Chongmin Lee
- Department of Nanomaterials Science and Engineering, University of Science and Technology, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon, 34132, Republic of Korea
| | - Sun Kyung Kim
- Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon, 34132, Republic of Korea
| | - Hankwon Chang
- Department of Nanomaterials Science and Engineering, University of Science and Technology, Yuseong-gu, Daejeon, 34113, Republic of Korea
- Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon, 34132, Republic of Korea
| | - Hee Dong Jang
- Department of Nanomaterials Science and Engineering, University of Science and Technology, Yuseong-gu, Daejeon, 34113, Republic of Korea.
- Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Yuseong-gu, Daejeon, 34132, Republic of Korea.
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Ji P, Wan J, Xi Y, Guan Y, Zhang C, Gu X, Li J, Lu J, Zhang D. In situ growth of MnO@Na 2Ti 6O 13 heterojunction nanowires for high performance supercapacitors. NANOTECHNOLOGY 2019; 30:335401. [PMID: 30836342 DOI: 10.1088/1361-6528/ab0cd1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
One-dimensional tunnel and layer frame crystal structure materials are extremely attractive for energy storage in electrode materials. The energy storage properties of the electrode materials depend on their conductivity. Furthermore, the conductivity of electrode materials can be tailored through combination or doping with other materials, which transforms their properties from semiconductor to semimetallic or metallic and allow them to show unequaled performance for storage devices. In this work, heterostructures of manganese oxide (MnO) and modified sodium titanate (Na2Ti6O13) (MnO@Na2Ti6O13) nanowires are attained by the in situ thermal decomposition method. The heterojunction between MnO and Na2Ti6O13 allows the semiconductor properties of pure Na2Ti6O13 to show remarkable metallic behavior for improving the electrochemical performance. The capacitance of MnO@Na2Ti6O13 heterojunction nanowires can reach 272.3 F g-1, a power intensity of 250 W kg-1 at the energy density of 37.83 Wh kg-1 and retain 5000 W kg-1 at 6.67 Wh kg-1 as well. The energy storage mechanism of the MnO@Na2Ti6O13 heterostructure is studied by density functional theory. All of the results show that the MnO@Na2Ti6O13 heterostructure material has the potential to be an excellent supercapacitor material in the future.
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Affiliation(s)
- Peiyuan Ji
- Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing, 400044, People's Republic of China
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