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Pundir S, Upadhyay S, Priya R, Kumar N, Chetana S, Hossain I, Joshi NC, Pandey OP. Synthesis of 1D β-MnO2 for high-performance supercapacitor application. J Solid State Electrochem 2022. [DOI: 10.1007/s10008-022-05347-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Abdollahi A, Abnavi A, Ghasemi F, Ghasemi S, Sanaee Z, Mohajerzadeh S. Facile synthesis and simulation of MnO2 nanoflakes on vertically aligned carbon nanotubes, as a high-performance electrode for Li-ion battery and supercapacitor. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138826] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Plasma-Assisted Chemical Vapor Deposition of F-Doped MnO 2 Nanostructures on Single Crystal Substrates. NANOMATERIALS 2020; 10:nano10071335. [PMID: 32650613 PMCID: PMC7407531 DOI: 10.3390/nano10071335] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/02/2020] [Accepted: 07/04/2020] [Indexed: 11/29/2022]
Abstract
MnO2 nanostructures were fabricated by plasma assisted-chemical vapor deposition (PA-CVD) using a fluorinated diketonate diamine manganese complex, acting as single-source precursor for both Mn and F. The syntheses were performed from Ar/O2 plasmas on MgAl2O4(100), YAlO3(010), and Y3Al5O12(100) single crystals at a growth temperature of 300 °C, in order to investigate the substrate influence on material chemico-physical properties. A detailed characterization through complementary analytical techniques highlighted the formation of highly pure and oriented F-doped systems, comprising the sole β-MnO2 polymorph and exhibiting an inherent oxygen deficiency. Optical absorption spectroscopy revealed the presence of an appreciable Vis-light harvesting, of interest in view of possible photocatalytic applications in pollutant degradation and hydrogen production. The used substrates directly affected the system structural features, as well as the resulting magnetic characteristics. In particular, magnetic force microscopy (MFM) measurements, sensitive to the out-of-plane magnetization component, highlighted the formation of spin domains and long-range magnetic ordering in the developed materials, with features dependent on the system morphology. These results open the door to future engineering of the present nanostructures as possible magnetic media for integration in data storage devices.
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Hong SB, Jeong JM, Kang HG, Seo D, Cha Y, Jeon H, Lee GY, Irshad M, Kim DH, Hwang SY, Kim JW, Choi BG. Fast and Scalable Hydrodynamic Synthesis of MnO 2/Defect-Free Graphene Nanocomposites with High Rate Capability and Long Cycle Life. ACS APPLIED MATERIALS & INTERFACES 2018; 10:35250-35259. [PMID: 30289681 DOI: 10.1021/acsami.8b12894] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
The integration of metal oxides and carbon materials provides a great potential for enhancing the high energy and power densities of supercapacitors, but the rational design and scalable fabrication of such composite materials still remain a challenge. Herein, we report a fast, scalable, and one-pot hydrodynamic synthesis for preparing ion conductive and defect-free graphene from graphite and MnO2/graphene nanocomposites. The use of this hydrodynamic method using Taylor-Couette flow allows us to efficiently fast shear-exfoliate graphite into large quantities of high-quality graphene sheets. Deposition of MnO2 on graphene is subsequently performed in a fluidic reactor within 10 min. The prepared MnO2/graphene nanocomposite shows outstanding electrochemical performances, such as a high specific capacitance of 679 F/g at 25 mV/s, a high rate capability of 74.7% retention at an extremely high rate of 1000 mV/s, and an excellent cycling characteristic (∼94.7% retention over 20 000 cycles). An asymmetric supercapacitor device is fabricated by assembling an anode of graphene and a cathode of MnO2/graphene, which resulted in high energy (35.2 W h/kg) and power (7.4 kW/kg) densities (accounting for the mass of both electrodes and the electrolyte) with a high rate capability and long cycle life.
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Affiliation(s)
- Seok Bok Hong
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
| | - Jae-Min Jeong
- Department of Chemical & Biomolecular Engineering , KAIST , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Heon Gyu Kang
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
| | - Donghyuk Seo
- Department of Chemical & Biomolecular Engineering , KAIST , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Younghyun Cha
- Department of Chemical & Biomolecular Engineering , KAIST , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Hyeonyeol Jeon
- Research Center for Bio-Based Chemistry , Korea Research Institute of Chemical Technology (KRICT) , Ulsan 44429 , Republic of Korea
| | - Geun Young Lee
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
| | - Mobina Irshad
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
| | - Do Hyun Kim
- Department of Chemical & Biomolecular Engineering , KAIST , 291 Daehak-ro , Yuseong-gu, Daejeon 34141 , Republic of Korea
| | - Sung Yeon Hwang
- Research Center for Bio-Based Chemistry , Korea Research Institute of Chemical Technology (KRICT) , Ulsan 44429 , Republic of Korea
- Advanced Materials and Chemical Engineering , University of Science and Technology (UST) , Daejeon 34113 , Republic of Korea
| | - Jung Won Kim
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
| | - Bong Gill Choi
- Department of Chemical Engineering , Kangwon National University , 346 Joongang-ro , Samcheok , Gangwon-do 25913 , Republic of Korea
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Krishnamoorthy K, Pazhamalai P, Sahoo S, Lim JH, Choi KH, Kim SJ. A High-Energy Aqueous Sodium-Ion Capacitor with Nickel Hexacyanoferrate and Graphene Electrodes. ChemElectroChem 2017. [DOI: 10.1002/celc.201700690] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Parthiban Pazhamalai
- Department of Mechatronics Engineering; Jeju National University; 63243 Republic of Korea
| | - Surjit Sahoo
- Department of Mechatronics Engineering; Jeju National University; 63243 Republic of Korea
| | - Jong Hwan Lim
- Department of Mechatronics Engineering; Jeju National University; 63243 Republic of Korea
| | - Kyung Hyun Choi
- Department of Mechatronics Engineering; Jeju National University; 63243 Republic of Korea
| | - Sang Jae Kim
- Department of Mechatronics Engineering; Jeju National University; 63243 Republic of Korea
- Department of Advanced Convergence Science and Technology; Jeju National University; Jeju 63243 Republic of Korea
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