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Huynh K, Maddipudi B, Shende R. Hybrid Mesoporous Carbon/Copper Ferrite Electrode for Asymmetric Supercapacitors. Nanomaterials (Basel) 2023; 13:2365. [PMID: 37630952 PMCID: PMC10459617 DOI: 10.3390/nano13162365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Revised: 08/13/2023] [Accepted: 08/15/2023] [Indexed: 08/27/2023]
Abstract
Asymmetric supercapacitors (ASCs) with two dissimilar electrodes are known to exhibit relatively moderate energy and power densities. If electrodes derived from earth-abundant materials or renewable resources such as lignocellulosic biomass (LCB) are used for fabrication, energy storage systems are expected to become less expensive and more sustainable. Hybrid electrode materials have advantages such as higher surface area, better chemical stability, and superior energy density. This study reports on the synthesis of a novel hybrid electrode material containing porous carbon (POC) and copper ferrite, which is designated as POC@Cu-ferrite, and its electrochemical performance in ASC configuration. Corn stover derived hydrochar is utilized for the sol-gel synthesis of POC@Cu-ferrite hybrid material using earth-abundant Cu and Fe-based precursors. This material is characterized using X-ray diffraction (XRD), Raman spectroscopy, Brunauer-Emmett-Teller (BET) surface area analyzer, and scanning and transmission electron microscopy (SEM/TEM). As-synthesized Cu-ferrite is found to contain 89.2% CuFe2O4 and 10.8% Fe2O3, whereas other phases such as Fe3O4, CuFeO2, and CuO are observed for the POC@Cu-ferrite. BET-specific surface area (SSA) and pore volume of POC@Cu-ferrite are observed as 1068 m2/g and 0.72 cm3/g, respectively. POC@Cu-ferrite hybrid electrode is used with POC opposite electrode to fabricate ASC, which is tested using Gamry G-300 potentiostat/galvanostat/ZRA to obtain cyclic voltammetry (CV) profiles and galvanostatic charge-discharge (GCD) plots. ASC is also prepared using Cu-ferrite and POC materials and its specific capacitance and stability are compared with ASCs prepared with POC@Cu-ferrite and POC or graphene nanoplatelets (GNPs) electrodes. POC@Cu-ferrite hybrid electrode is found to be superior with a 2-fold higher capacitance and significant electrochemical stability over 100 GCD cycles as compared to the Cu-ferrite electrode.
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Affiliation(s)
| | | | - Rajesh Shende
- Karen M. Swindler Department of Chemical and Biological Engineering, South Dakota School of Mines & Technology, Rapid City, SD 57701, USA; (K.H.); (B.M.)
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Bennie RB, Joel C, Raj ANP, Antony AJ, Pillai SI. Electrical conductivity and electrochemical studies of Cr-doped MoO(3) nanoflakes for energy storage applications. J Solid State Electrochem 2023; 27:271-80. [PMID: 36373059 DOI: 10.1007/s10008-022-05319-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2022] [Revised: 10/19/2022] [Accepted: 10/23/2022] [Indexed: 11/06/2022]
Abstract
The growing demand for electricity has increased the interest of the researchers towards exploration of energy storing devices (ESDs). With the motif for developing electrochemical energy storage devices, this research work is focussed on the study of MoO3 nanoparticles and its doping with chromium as an efficient electrode material for energy storage applications. The nanoparticles were synthesized by hydrothermal method and were examined by powder X-ray diffraction, which determined the thermodynamically stable orthorhombic phase of MoO3, and their morphologies were examined using scanning electron microscopy displaying flake-like structures. The typical vibrational bands of Mo-O were identified from Infra-red and Raman spectral analysis. The ultra violet diffuse reflectance spectra revealed the decrease in optical band gap after doping with chromium. The temperature dependent AC and DC conductivities were enhanced on doping. Electrochemical behaviour of the nanoparticles was probed by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) measurements and galvanostatic charge-discharge (GCD) analysis for which specific capacitance (C sp) value of 334 Fg-1 was achieved for Cr-doped MoO3 nanoparticles. The electrochemical performance of the sample was found to be increased after doping with Cr.
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Ullah R, Khan N, Khattak R, Khan M, Khan MS, Ali OM. Preparation of Electrochemical Supercapacitor Based on Polypyrrole/Gum Arabic Composites. Polymers (Basel) 2022; 14:242. [PMID: 35054647 DOI: 10.3390/polym14020242] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Revised: 01/01/2022] [Accepted: 01/04/2022] [Indexed: 02/04/2023] Open
Abstract
The current research focused on the super capacitive behavior of organic conducting polymer, i.e., polypyrrole (PPy) and its composites with gum arabic (GA) prepared via inverse emulsion polymerization. The synthesized composites material was analyzed by different analytical techniques, such as UV-visible, FTIR, TGA, XRD, and SEM. The UV-Vis and FTIR spectroscopy clearly show the successful insertion of GA into PPy matrix. The TGA analysis shows high thermal stability for composites than pure PPy. The XRD and SEM analysis show the crystalline and amorphous structures and overall morphology of the composites is more compact and mesoporous as compared to the pure PPy. The electrochemical properties of modified solid state supercapacitors established on pure polypyrrole (PPy), polypyrrole/gum arabic (PPy/GA) based composites were investigated through cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS) and galvanostatic charge–discharge (GCD). The specific capacitance of the PPy modified gold electrode is impressive (~168 F/g). The specific capacitance of PPy/GA 1 electrode has been increased to 368 F/g with a high energy density and power density (~73 Wh/kg), and (~599 W/kg) respectively.
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Okuni M, Yakushijin K, Uehara K, Ichikawa H, Suto H, Hashimoto A, Tanaka Y, Shinzato I, Sakai R, Mizutani Y, Nagao S, Kurata K, Kakiuchi S, Miyata Y, Inui Y, Saito Y, Kawamoto S, Yamamoto K, Ito M, Matsuoka H, Minami H. Successful Bridging Chemotherapy with Gemcitabine, Carboplatin, and Dexamethasone before Unrelated Stem Cell Transplantation for Hepatosplenic T-cell Lymphoma. Intern Med 2019; 58:707-712. [PMID: 30449784 PMCID: PMC6443557 DOI: 10.2169/internalmedicine.1266-18] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
A 45-year-old woman was diagnosed with hepatosplenic T-cell lymphoma (HSTCL), a rare subtype of peripheral T-cell lymphoma. She received different types of chemotherapy, but disease progression was observed. To reduce the tumor burden before an unrelated bone marrow transplantation, combination chemotherapy consisting of the gemcitabine, carboplatin, and dexamethasone (GCD) was administered as bridging therapy, resulting in a reduction in the number of lymphoma cells. We were then able to perform bone marrow transplantation. Although she experienced some adverse events, she successfully achieved long-term remission. We herein report a successful case of HSTCL treated with unrelated stem cell transplantation following the GCD regimen as bridging chemotherapy.
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Affiliation(s)
- Marika Okuni
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Kimikazu Yakushijin
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Keiichiro Uehara
- Department of Diagnostic Pathology, Kobe University Hospital, Japan
| | - Hiroya Ichikawa
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Hirotaka Suto
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Akiko Hashimoto
- Department of Hematology and Clinical Immunology, Kobe City Nishi-Kobe Medical Center, Japan
| | - Yasuhiro Tanaka
- Department of Hematology and Clinical Immunology, Kobe City Nishi-Kobe Medical Center, Japan
| | - Isaku Shinzato
- Department of Hematology and Clinical Immunology, Kobe City Nishi-Kobe Medical Center, Japan
| | - Rina Sakai
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Yu Mizutani
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Shigeki Nagao
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Keiji Kurata
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Seiji Kakiuchi
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Yoshiharu Miyata
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Yumiko Inui
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Yasuyuki Saito
- Division of Molecular and Cellular Signaling, Department of Biochemistry and Molecular Biology, Kobe University Graduate School of Medicine, Japan
| | - Shinichiro Kawamoto
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Katsuya Yamamoto
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Mitsuhiro Ito
- Laboratory of Hematology, Division of Medical Biophysics, Kobe University Graduate School of Health Sciences, Japan
| | - Hiroshi Matsuoka
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
| | - Hironobu Minami
- The Division of Medical Oncology and Hematology, Department of Medicine, Kobe University Hospital, Japan
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Underhaug J, Koldsø H, Runager K, Nielsen JT, Sørensen CS, Kristensen T, Otzen DE, Karring H, Malmendal A, Schiøtt B, Enghild JJ, Nielsen NC. Mutation in transforming growth factor beta induced protein associated with granular corneal dystrophy type 1 reduces the proteolytic susceptibility through local structural stabilization. Biochim Biophys Acta 2013; 1834:2812-22. [PMID: 24129074 DOI: 10.1016/j.bbapap.2013.10.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 09/30/2013] [Accepted: 10/06/2013] [Indexed: 10/26/2022]
Abstract
Hereditary mutations in the transforming growth factor beta induced (TGFBI) gene cause phenotypically distinct corneal dystrophies characterized by protein deposition in cornea. We show here that the Arg555Trp mutant of the fourth fasciclin 1 (FAS1-4) domain of the protein (TGFBIp/keratoepithelin/βig-h3), associated with granular corneal dystrophy type 1, is significantly less susceptible to proteolysis by thermolysin and trypsin than the WT domain. High-resolution liquid-state NMR of the WT and Arg555Trp mutant FAS1-4 domains revealed very similar structures except for the region around position 555. The Arg555Trp substitution causes Trp555 to be buried in an otherwise empty hydrophobic cavity of the FAS1-4 domain. The first thermolysin cleavage in the core of the FAS1-4 domain occurs on the N-terminal side of Leu558 adjacent to the Arg555 mutation. MD simulations indicated that the C-terminal end of helix α3' containing this cleavage site is less flexible in the mutant domain, explaining the observed proteolytic resistance. This structural change also alters the electrostatic properties, which may explain increased propensity of the mutant to aggregate in vitro with 2,2,2-trifluoroethanol. Based on our results we propose that the Arg555Trp mutation disrupts the normal degradation/turnover of corneal TGFBIp, leading to accumulation and increased propensity to aggregate through electrostatic interactions.
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Affiliation(s)
- Jarl Underhaug
- Center for Insoluble Protein Structures (inSPIN), Interdisciplinary Nanoscience Center (iNANO) and Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark; Department of Biomedicine, University of Bergen, Jonas Lies vei 91, NO-5009 Bergen, Norway
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