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Cotrina-Vinagre FJ, Rodríguez-García ME, Del Pozo-Filíu L, Hernández-Laín A, Arteche-López A, Morte B, Sevilla M, Pérez-Jurado LA, Quijada-Fraile P, Camacho A, Martínez-Azorín F. Expanding the genetic and phenotypic spectrum of congenital myasthenic syndrome: new homozygous VAMP1 splicing variants in 2 novel individuals. J Hum Genet 2024; 69:187-196. [PMID: 38355957 DOI: 10.1038/s10038-024-01228-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 02/05/2024] [Accepted: 02/05/2024] [Indexed: 02/16/2024]
Abstract
We report the cases of two Spanish pediatric patients with hypotonia, muscle weakness and feeding difficulties at birth. Whole-exome sequencing (WES) uncovered two new homozygous VAMP1 (Vesicle Associated Membrane Protein 1) splicing variants, NM_014231.5:c.129+5 G > A in the boy patient (P1) and c.341-24_341-16delinsAGAAAA in the girl patient (P2). This gene encodes the vesicle-associated membrane protein 1 (VAMP1) that is a component of a protein complex involved in the fusion of synaptic vesicles with the presynaptic membrane. VAMP1 has a highly variable C-terminus generated by alternative splicing that gives rise to three main isoforms (A, B and D), being VAMP1A the only isoform expressed in the nervous system. In order to assess the pathogenicity of these variants, expression experiments of RNA for VAMP1 were carried out. The c.129+5 G > A and c.341-24_341-16delinsAGAAAA variants induced aberrant splicing events resulting in the deletion of exon 2 (r.5_131del; p.Ser2TrpfsTer7) in the three isoforms in the first case, and the retention of the last 14 nucleotides of the 3' of intron 4 (r.340_341ins341-14_341-1; p.Ile114AsnfsTer77) in the VAMP1A isoform in the second case. Pathogenic VAMP1 variants have been associated with autosomal dominant spastic ataxia 1 (SPAX1) and with autosomal recessive presynaptic congenital myasthenic syndrome (CMS). Our patients share the clinical manifestations of CMS patients with two important differences: they do not show the typical electrophysiological pattern that suggests pathology of pre-synaptic neuromuscular junction, and their muscular biopsies present hypertrophic fibers type 1. In conclusion, our data expand both genetic and phenotypic spectrum associated with VAMP1 variants.
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Affiliation(s)
- Francisco Javier Cotrina-Vinagre
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN). Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain
| | - María Elena Rodríguez-García
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN). Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)-ISCIII, Madrid, Spain
| | - Lucía Del Pozo-Filíu
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN). Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain
| | - Aurelio Hernández-Laín
- Servicio de Anatomía Patológica (Neuropatología), Hospital Universitario 12 de Octubre, Madrid, Spain
| | - Ana Arteche-López
- Servicio de Genética, Hospital Universitario 12 de Octubre, E-28041, Madrid, Spain
| | - Beatriz Morte
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)-ISCIII, Madrid, Spain
- Instituto de Investigaciones Biomedicas Alberto Sols (CSIC-UAM), Madrid, Spain
| | - Marta Sevilla
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)-ISCIII, Madrid, Spain
- Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona, Spain
- Genetics Service, Hospital del Mar, Barcelona, Spain
| | - Luis Alberto Pérez-Jurado
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)-ISCIII, Madrid, Spain
- Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona, Spain
- Genetics Service, Hospital del Mar, Barcelona, Spain
| | - Pilar Quijada-Fraile
- Unidad Pediátrica de Enfermedades Raras, Enfermedades Mitocondriales y Metabólicas Hereditarias, Hospital 12 de Octubre, Madrid, Spain
| | - Ana Camacho
- Sección de Neurología Infantil, Hospital 12 de Octubre, Universidad Complutense de Madrid, Madrid, Spain
| | - Francisco Martínez-Azorín
- Grupo de Enfermedades Raras, Mitocondriales y Neuromusculares (ERMN). Instituto de Investigación Hospital 12 de Octubre (i+12), Madrid, Spain.
- Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER)-ISCIII, Madrid, Spain.
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Yu S, He J, Zhang Z, Sun Z, Xie M, Xu Y, Bie X, Li Q, Zhang Y, Sevilla M, Titirici MM, Zhou H. Towards Negative Emissions: Hydrothermal Carbonization of Biomass for Sustainable Carbon Materials. Adv Mater 2024; 36:e2307412. [PMID: 38251820 DOI: 10.1002/adma.202307412] [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: 07/25/2023] [Revised: 01/02/2024] [Indexed: 01/23/2024]
Abstract
The contemporary production of carbon materials heavily relies on fossil fuels, contributing significantly to the greenhouse effect. Biomass is a carbon-neutral resource whose organic carbon is formed from atmospheric CO2. Employing biomass as a precursor for synthetic carbon materials can fix atmospheric CO2 into solid materials, achieving negative carbon emissions. Hydrothermal carbonization (HTC) presents an attractive method for converting biomass into carbon materials, by which biomass can be transformed into materials with favorable properties in a distinct hydrothermal environment, and these carbon materials have made extensive progress in many fields. However, the HTC of biomass is a complex and interdisciplinary problem, involving simultaneously the physical properties of the underlying biomass and sub/supercritical water, the chemical mechanisms of hydrothermal synthesis, diverse applications of resulting carbon materials, and the sustainability of the entire technological routes. This review starts with the analysis of biomass composition and distinctive characteristics of the hydrothermal environment. Then, the factors influencing the HTC of biomass, the reaction mechanism, and the properties of resulting carbon materials are discussed in depth, especially the different formation mechanisms of primary and secondary hydrochars. Furthermore, the application and sustainability of biomass-derived carbon materials are summarized, and some insights into future directions are provided.
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Affiliation(s)
- Shijie Yu
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Jiangkai He
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Zhien Zhang
- William G. Lowrie Department of Chemical and Biomolecular Engineering, The Ohio State University, Columbus, OH, 43210, USA
| | - Zhuohua Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing, 100083, P.R. China
| | - Mengyin Xie
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Yongqing Xu
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Xuan Bie
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Qinghai Li
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Yanguo Zhang
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
| | - Marta Sevilla
- Instituto de Ciencia y Tecnología del Carbono (INCAR), CSIC, Francisco Pintado Fe 26, Oviedo, 33011, Spain
| | | | - Hui Zhou
- Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Beijing Key Laboratory of CO2 Utilization and Reduction Technology, Department of Energy and Power Engineering, Tsinghua University, Beijing, 100084, P.R. China
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Casal M, Díez N, Payá S, Sevilla M. Cork-Derived Carbon Sheets for High-Performance Na-Ion Capacitors. ACS Appl Energy Mater 2023; 6:8120-8131. [PMID: 37592928 PMCID: PMC10431350 DOI: 10.1021/acsaem.3c01212] [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] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 07/03/2023] [Indexed: 08/19/2023]
Abstract
S-doped carbon sheets have been easily prepared by deconstructing the 3D cellular structure of a fully sustainable and renewable biomass material such as cork through a mild ball-milling process. S-doping of the material (>14 wt % S) has been achieved by using sulfur as an earth-abundant, cost-effective, and environmentally benign S-dopant. Such synthesized materials provide large Na storage capacities in the range of 300-550 mAh g-1 at 0.1 A g-1 and can handle large current densities of 10 A g-1, providing 55-140 mAh g-1. Their increased packing density compared to the 3D pristine structure allows them to also provide good volumetric capacities in the range of 285-522 mAh cm-3 at 0.1 A g-1 and 53-133 mAh cm-3 at 10 A g-1. In addition, highly porous carbon sheets (SBET > 2700 m2 g-1) have been produced from the same carbon precursor by rationally designing the chemical activation approach. These materials are able to provide good anion storage capacities/capacitances of up to 100-114 mAh g-1/163-196 F g-1. A sodium-ion capacitor assembled with the optimized S-doped carbon sheets and the highly porous carbon sheets with mass matching ratios provided the best energy/power characteristics (90 Wh kg-1 at 29 kW kg-1) in combination with robust cycling stability over 10,000 cycles, with a capacity fade of only 0.0018% per cycle.
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Affiliation(s)
- María
Dolores Casal
- Instituto de Ciencia y Tecnología
del Carbono (INCAR), CSIC, Francisco Pintado Fe 26, 33011 Oviedo, Spain
| | - Noel Díez
- Instituto de Ciencia y Tecnología
del Carbono (INCAR), CSIC, Francisco Pintado Fe 26, 33011 Oviedo, Spain
| | - Sara Payá
- Instituto de Ciencia y Tecnología
del Carbono (INCAR), CSIC, Francisco Pintado Fe 26, 33011 Oviedo, Spain
| | - Marta Sevilla
- Instituto de Ciencia y Tecnología
del Carbono (INCAR), CSIC, Francisco Pintado Fe 26, 33011 Oviedo, Spain
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Fombona‐Pascual A, Díez N, Fuertes AB, Sevilla M. Eco-Friendly Synthesis of 3D Disordered Carbon Materials for High-Performance Dual Carbon Na-Ion Capacitors. ChemSusChem 2022; 15:e202201046. [PMID: 35880627 PMCID: PMC9804518 DOI: 10.1002/cssc.202201046] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 07/14/2022] [Indexed: 06/15/2023]
Abstract
An eco-friendly and sustainable salt-templating approach was proposed for the production of anode materials with a 3D sponge-like structure for sodium-ion capacitors using gluconic acid as carbon precursor and sodium carbonate as water-removable template. The optimized carbon material combined porous thin walls that provided short diffusional paths, a highly disordered microstructure with dilated interlayer spacing, and a large oxygen content, all of which facilitated Na ion transport and provided plenty of active sites for Na adsorption. This material provided a capacity of 314 mAh g-1 at 0.1 A g-1 and 130 mAh g-1 at 10 A g-1 . When combined with a 3D highly porous carbon cathode (SBET ≈2300 m2 g-1 ) synthesized from the same precursor, the Na-ion capacitor showed high specific energy/power, that is 110 Wh kg-1 at low power and still 71 Wh kg-1 at approximately 26 kW kg-1 , and a good capacity retention of 70 % over 10000 cycles.
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Affiliation(s)
- Alba Fombona‐Pascual
- Instituto de Ciencia y Tecnología del Carbono (INCAR)CSICFrancisco Pintado Fe 2633011OviedoSpain
| | - Noel Díez
- Instituto de Ciencia y Tecnología del Carbono (INCAR)CSICFrancisco Pintado Fe 2633011OviedoSpain
| | - Antonio B. Fuertes
- Instituto de Ciencia y Tecnología del Carbono (INCAR)CSICFrancisco Pintado Fe 2633011OviedoSpain
| | - Marta Sevilla
- Instituto de Ciencia y Tecnología del Carbono (INCAR)CSICFrancisco Pintado Fe 2633011OviedoSpain
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Baptista LA, Dutta RC, Sevilla M, Heidari M, Potestio R, Kremer K, Cortes-Huerto R. Density-functional-theory approach to the Hamiltonian adaptive resolution simulation method. J Phys Condens Matter 2021; 33:184003. [PMID: 33690194 DOI: 10.1088/1361-648x/abed1d] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 03/09/2021] [Indexed: 06/12/2023]
Abstract
In the Hamiltonian adaptive resolution simulation method (H-AdResS) it is possible to simulate coexisting atomistic (AT) and ideal gas representations of a physical system that belong to different subdomains within the simulation box. The Hamiltonian includes a field that bridges both models by smoothly switching on (off) the intermolecular potential as particles enter (leave) the AT region. In practice, external one-body forces are calculated and applied to enforce a reference density throughout the simulation box, and the resulting external potential adds up to the Hamiltonian. This procedure suggests an apparent dependence of the final Hamiltonian on the system's thermodynamic state that challenges the method's statistical mechanics consistency. In this paper, we explicitly include an external potential that depends on the switching function. Hence, we build a grand canonical potential for this inhomogeneous system to find the equivalence between H-AdResS and density functional theory (DFT). We thus verify that the external potential inducing a constant density profile is equal to the system's excess chemical potential. Given DFT's one-to-one correspondence between external potential and equilibrium density, we find that a Hamiltonian description of the system is compatible with the numerical implementation based on enforcing the reference density across the simulation box. In the second part of the manuscript, we focus on assessing our approach's convergence and computing efficiency concerning various model parameters, including sample size and solute concentrations. To this aim, we compute the excess chemical potential of water, aqueous urea solutions and Lennard-Jones (LJ) mixtures. The results' convergence and accuracy are convincing in all cases, thus emphasising the method's robustness and capabilities.
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Affiliation(s)
- L A Baptista
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - R C Dutta
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - M Sevilla
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - M Heidari
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - R Potestio
- Physics Department, University of Trento, via Sommarive, 14 I-38123 Trento, Italy
- INFN-TIFPA, Trento Institute for Fundamental Physics and Applications, I-38123 Trento, Italy
| | - K Kremer
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - R Cortes-Huerto
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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6
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Abstract
(Photo)electrocatalysis holds the promise to enable the broad implementation of renewable energies. The articles highlighted in this issue emphasize advances in types and activity of catalysts and electrode materials for a variety of reactions and technologies.
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Affiliation(s)
- Abhishek Dey
- Indian Association for the Cultivation of Science, Kolkata, WB 700032, India.
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Sevilla M, Díez N, Fuertes AB. More Sustainable Chemical Activation Strategies for the Production of Porous Carbons. ChemSusChem 2021; 14:94-117. [PMID: 33047490 DOI: 10.1002/cssc.202001838] [Citation(s) in RCA: 45] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/25/2020] [Indexed: 06/11/2023]
Abstract
The preparation of porous carbons attracts a great deal of attention given the importance of these materials in many emerging applications, such as hydrogen storage, CO2 capture, and energy storage in supercapacitors and batteries. In particular, porous carbons produced by applying chemical activation methods are preferred because of the high pore development achieved. However, given the environmental risks associated with conventional activating agents such as KOH, the development of greener chemical activation methodologies is an important objective. This Review summarizes recent progress in the production of porous carbons by using more sustainable strategies based on chemical activation. The use of less-corrosive chemical agents as an alternative to KOH is thoroughly reviewed. In addition, progress achieved to date by using emerging self-activation methodologies applied to organic salts and biomass products is also discussed.
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Affiliation(s)
- Marta Sevilla
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26., 33011, Oviedo, Spain
| | - Noel Díez
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26., 33011, Oviedo, Spain
| | - Antonio B Fuertes
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC, Francisco Pintado Fe, 26., 33011, Oviedo, Spain
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Díez N, Sevilla M, Fuertes AB. Highly Packed Monodisperse Porous Carbon Microspheres for Energy Storage in Supercapacitors and Li−S Batteries. ChemElectroChem 2020. [DOI: 10.1002/celc.202000960] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Noel Díez
- Instituto de Ciencia y Tecnología del Carbono INCAR-CSIC Francisco Pintado Fe, 26. 33011 Oviedo Spain
| | - Marta Sevilla
- Instituto de Ciencia y Tecnología del Carbono INCAR-CSIC Francisco Pintado Fe, 26. 33011 Oviedo Spain
| | - Antonio B. Fuertes
- Instituto de Ciencia y Tecnología del Carbono INCAR-CSIC Francisco Pintado Fe, 26. 33011 Oviedo Spain
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Wu F, Chu F, Ferrero GA, Sevilla M, Fuertes AB, Borodin O, Yu Y, Yushin G. Boosting High-Performance in Lithium-Sulfur Batteries via Dilute Electrolyte. Nano Lett 2020; 20:5391-5399. [PMID: 32463248 DOI: 10.1021/acs.nanolett.0c01778] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Polysulfide shuttle effects, active material losses, formation of resistive surface layers, and continuous electrolyte consumption create a major barrier for the lightweight and low-cost lithium-sulfur (Li-S) battery adoption. Tuning electrolyte composition by using additives and most importantly by substantially increasing electrolyte molarity was previously shown to be one of the most effective strategies. Contrarily, little attention has been paid to dilute and super-diluted LiTFSI/DME/DOL/LiNO3 based-electrolytes, which have been thought to aggravate the polysulfide dissolution and shuttle effects. Here we challenge this conventional wisdom and demonstrate outstanding capabilities of a dilute (0.1 mol L-1 of LiTFSI in DME/DOL with 1 wt. % LiNO3) electrolyte to enable better electrode wetting, greatly improved high-rate capability, and stable cycle performance for high sulfur loading cathodes and low electrolyte/sulfur ratio in Li-S cells. Overall, the presented study shines light on the extraordinary ability of such electrolyte systems to suppress short-chain polysulfide dissolution and polysulfide shuttle effects.
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Affiliation(s)
- Feixiang Wu
- School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, P.R. China
| | - Fulu Chu
- School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Central South University, Changsha 410083, P.R. China
| | - Guillermo A Ferrero
- Instituto Nacional del Carbón (CSIC), Fco. Pintado Fe 26, Oviedo 33011, Spain
| | - Marta Sevilla
- Instituto Nacional del Carbón (CSIC), Fco. Pintado Fe 26, Oviedo 33011, Spain
| | - Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC), Fco. Pintado Fe 26, Oviedo 33011, Spain
| | - Oleg Borodin
- Energy Storage Branch, Sensors and Electron Devices Directorate, United States Army Research Laboratory, Adelphi, Maryland 20783, United States
| | - Yan Yu
- Hefei National Laboratory for Physical Sciences at the Microscale Department of Materials Science and Engineering, CAS Key Laboratory of Materials for Energy Conversion, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China
- Dalian National Laboratory for Clean Energy (DNL), Chinese Academy of Sciences (CAS), Dalian 116023, P.R. China
| | - Gleb Yushin
- School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States
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Sevilla M, Carro-Rodríguez J, Díez N, Fuertes AB. Straightforward synthesis of Sulfur/N,S-codoped carbon cathodes for Lithium-Sulfur batteries. Sci Rep 2020; 10:4866. [PMID: 32184424 PMCID: PMC7078249 DOI: 10.1038/s41598-020-61583-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Accepted: 02/17/2020] [Indexed: 11/09/2022] Open
Abstract
An upgrade of the scalable fabrication of high-performance sulfur-carbon cathodes is essential for the widespread commercialization of this technology. Herein we present a simple, cost-effective and scalable approach for the fabrication of cathodes comprising sulfur and high-surface area, N,S-codoped carbons. The method involves the use of a sulfur salt, i.e. sodium thiosulfate, as activating agent, sulfur precursor and S-dopant, and polypyrrole as carbon precursor and N-dopant. In this way, the production of the porous host and the incorporation of sulfur are combined in the same procedure. The porous hosts thus produced have BET surface areas in excess of 2000 m2 g−1, a micro-mesoporous structure, as well as sulfur and nitrogen contents of 5–6 wt% and ~2 wt%, respectively. The elemental sulfur content in the composites can be precisely modulated in the range of 24 to ca. 90 wt% by controlling the amount of sodium thiosulfate used. Remarkably, these porous carbons are able to accommodate up to 80 wt% sulfur exclusively within their porosity. When analyzed in lithium-sulfur batteries, these sulfur-carbon composites show high specific capacities of 1100 mAh g−1 at a low C-rate of 0.1 C and above 500 mAh g−1 at a high rate of 2 C for sulfur contents in the range of 50–80 wt%. Remarkably, the composites with 51–65 wt% S can still provide above 400 mAh g−1 at an ultra-fast rate of 4 C (where a charge and discharge cycle takes only ten minutes). The good rate capability and sulfur utilization was additionally assessed for cathodes with a high sulfur content (65–74%) and a high sulfur loading (>5 mg cm−2). In addition, cathodes of 4 mg cm−2 successfully cycled for 260 cycles at 0.2 C showed only a low loss of 0.12%/cycle.
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Affiliation(s)
- Marta Sevilla
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC. Francisco Pintado Fe 26, Oviedo, 33011, Spain.
| | - Jorge Carro-Rodríguez
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC. Francisco Pintado Fe 26, Oviedo, 33011, Spain
| | - Noel Díez
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC. Francisco Pintado Fe 26, Oviedo, 33011, Spain.
| | - Antonio B Fuertes
- Instituto de Ciencia y Tecnología del Carbono, INCAR-CSIC. Francisco Pintado Fe 26, Oviedo, 33011, Spain
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Ren M, Sevilla M, Fuertes AB, Mokaya R, Tour JM, Jalilov AS. Pore Characteristics for Efficient CO 2 Storage in Hydrated Carbons. ACS Appl Mater Interfaces 2019; 11:44390-44398. [PMID: 31689084 DOI: 10.1021/acsami.9b17833] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Development of new approaches for carbon dioxide (CO2) capture is important in both scientific and technological aspects. One of the emerging methods in CO2 capture research is based on the use of gas-hydrate crystallization in confined porous media. Pore dimensions and surface functionality of the pores play important roles in the efficiency of CO2 capture. In this report, we summarize work on several porous carbons (PCs) that differ in pore dimensions that range from supermicropores to mesopores, as well as surfaces ranging from hydrophilic to hydrophobic. Water was imbibed into the PCs, and the CO2 uptake performance, in dry and hydrated forms, was determined at pressures of up to 54 bar to reveal the influence of pore characteristics on the efficiency of CO2 capture and storage. The final hydrated carbon materials had H2O-to-carbon weight ratios of 1.5:1. Upon CO2 capture, the H2O/CO2 molar ratio was found to be as low as 1.8, which indicates a far greater CO2 capture capacity in hydrated PCs than ordinarily seen in CO2-hydrate formations, wherein the H2O/CO2 ratio is 5.72. Our mechanistic proposal for attainment of such a low H2O/CO2 ratio within the PCs is based on the finding that most of the CO2 is captured in gaseous form within micropores of diameter <2 nm, wherein it is blocked by external CO2-hydrate formations generated in the larger mesopores. Therefore, to have efficient high-pressure CO2 capture by this mechanism, it is necessary to have PCs with a wide pore size distribution consisting of both micropores and mesopores. Furthermore, we found that hydrated microporous or supermicroporous PCs do not show any hysteretic CO2 uptake behavior, which indicates that CO2 hydrates cannot be formed within micropores of diameter 1-2 nm. Alternatively, mesoporous and macroporous carbons can accommodate higher yields of CO2 hydrates, which potentially limits the CO2 uptake capacity in those larger pores to a H2O/CO2 ratio of 5.72. We found that high nitrogen content prevents the formation of CO2 hydrates presumably due to their destabilization and associated increase in system entropy via stronger noncovalent interactions between the nitrogen functional groups and H2O or CO2.
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Affiliation(s)
| | - Marta Sevilla
- Instituto Nacional del Carbon (CSIC), Francisco Pintado Fe 26, Oviedo 33011, Spain
| | - Antonio B Fuertes
- Instituto Nacional del Carbon (CSIC), Francisco Pintado Fe 26, Oviedo 33011, Spain
| | - Robert Mokaya
- School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | | | - Almaz S Jalilov
- Department of Chemistry and Center for Integrative Petroleum Research, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
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Qiao M, Ferrero GA, Fernández Velasco L, Vern Hor W, Yang Y, Luo H, Lodewyckx P, Fuertes AB, Sevilla M, Titirici MM. Boosting the Oxygen Reduction Electrocatalytic Performance of Nonprecious Metal Nanocarbons via Triple Boundary Engineering Using Protic Ionic Liquids. ACS Appl Mater Interfaces 2019; 11:11298-11305. [PMID: 30817109 DOI: 10.1021/acsami.8b18375] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
The oxygen reduction reaction (ORR) in aqueous media plays a critical role in sustainable and clean energy technologies such as polymer electrolyte membrane and alkaline fuel cells. In this work, we present a new concept to improve the ORR performance by engineering the interface reaction at the electrocatalyst/electrolyte/oxygen triple-phase boundary using a protic and hydrophobic ionic liquid and demonstrate the wide and general applicability of this concept to several Pt-free catalysts. Two catalysts, Fe-N codoped and metal-free N-doped carbon electrocatalysts, are used as a proof of concept. The ionic liquid layer grafted at the nanocarbon surface creates a water-equilibrated secondary reaction medium with a higher O2 affinity toward oxygen adsorption, promoting the diffusion toward the catalytic active site, while its protic character provides sufficient H+/H3O+ conductivity, and the hydrophobic nature prevents the resulting reaction product water from accumulating and blocking the interface. Our strategy brings obvious improvements in the ORR performance in both acid and alkaline electrolytes, while the catalytic activity of FeNC-nanocarbon outperforms commercial Pt-C in alkaline electrolytes. We believe that this research will pave new routes toward the development of high-performance ORR catalysts free of noble metals via careful interface engineering at the triple point.
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Affiliation(s)
- Mo Qiao
- Department of Chemical Engineering , Imperial College London , South Kensington Campus , London SW7 2AZ , U.K
| | | | | | | | | | | | - Peter Lodewyckx
- Department of Chemistry , Royal Military Academy , Avenue Renaissance 30 , Brussels 1000 , Belgium
| | - Antonio B Fuertes
- Instituto Nacional del Carbon (CSIC) , P.O. Box 73, Oviedo 33080 , Spain
| | - Marta Sevilla
- Instituto Nacional del Carbon (CSIC) , P.O. Box 73, Oviedo 33080 , Spain
| | - Maria-Magdalena Titirici
- Department of Chemical Engineering , Imperial College London , South Kensington Campus , London SW7 2AZ , U.K
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Vaquero J, Zurita M, Rico MA, Aguayo C, Bonilla C, Marin E, Tapiador N, Sevilla M, Vazquez D, Carballido J, Fernandez C, Rodriguez-Boto G, Ovejero M. Intrathecal administration of autologous mesenchymal stromal cells for spinal cord injury: Safety and efficacy of the 100/3 guideline. Cytotherapy 2018; 20:806-819. [PMID: 29853256 DOI: 10.1016/j.jcyt.2018.03.032] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2018] [Revised: 03/15/2018] [Accepted: 03/19/2018] [Indexed: 12/12/2022]
Abstract
BACKGROUND AIMS Cell therapy with autologous mesenchymal stromal cells (MSCs) in patients with spinal cord injury (SCI) is beginning, and the search for its better clinical application is an urgent need. METHODS We present a phase 2 clinical trial in patients with chronic SCI who received three intrathecal administrations of 100 x 106 MSCs and were followed for 10 months from the first administration. Efficacy analysis was performed on nine patients, and safety analysis was performed on 11 patients. Clinical scales, urodynamic, neurophysiological and neuroimaging studies were performed previous to treatment and at the end of the follow-up. RESULTS The treatment was well-tolerated, without any adverse event related to MSC administration. Patients showed variable clinical improvement in sensitivity, motor power, spasms, spasticity, neuropathic pain, sexual function or sphincter dysfunction, regardless of the level or degree of injury, age or time elapsed from the SCI. In the course of follow-up three patients, initially classified as ASIA A, B and C, changed to ASIA B, C and D, respectively. In urodynamic studies, at the end of follow-up, 66.6% of the patients showed decrease in postmicturition residue and improvement in bladder compliance. At this time, neurophysiological studies showed that 55.5% of patients improved in somatosensory or motor-evoked potentials, and that 44.4% of patients improved in voluntary muscle contraction together with infralesional active muscle reinnervation. CONCLUSIONS The present guideline for cell therapy is safe and shows efficacy in patients with SCI, mainly in recovery of sphincter dysfunction, neuropathic pain and sensitivity.
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Affiliation(s)
- Jesús Vaquero
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain.
| | - Mercedes Zurita
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Miguel A Rico
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Concepcion Aguayo
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Celia Bonilla
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Esperanza Marin
- Clinical Neurophysiology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Noemi Tapiador
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Marta Sevilla
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - David Vazquez
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Joaquin Carballido
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Cecilia Fernandez
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Gregorio Rodriguez-Boto
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Mercedes Ovejero
- Statistic Unit, Sermes Contract Research Organization (CRO), Madrid, Spain
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Vaquero J, Zurita M, Rico MA, Aguayo C, Fernandez C, Rodriguez-Boto G, Marin E, Tapiador N, Sevilla M, Carballido J, Vazquez D, Garcia-Olmo D, Guadalajara H, Leon M, Valverde I. Cell therapy with autologous mesenchymal stromal cells in post-traumatic syringomyelia. Cytotherapy 2018; 20:796-805. [PMID: 29784434 DOI: 10.1016/j.jcyt.2018.04.006] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/10/2018] [Accepted: 04/21/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND AIMS Recently, clinical studies show that cell therapy with mesenchymal stromal cells (MSCs) improves the sequelae chronically established in paraplegic patients, being necessary to know which of them can obtain better benefit. METHODS We present here a phase 2 clinical trial that includes six paraplegic patients with post-traumatic syringomyelia who received 300 million MSCs inside the syrinx and who were followed up for 6 months. Clinical scales, urodynamic, neurophysiological, magnetic resonance (MR) and studies of ano-rectal manometry were performed to assess possible improvements. RESULTS In all the cases, MR at the end of the study showed a clear reduction of the syrinx, and, at this time, signs of improvement in the urodynamic studies were found. Moreover, four patients improved in ano-rectal manometry. Four patients improved in neurophysiological studies, with signs of improvement in evoked potentials in three patients. In the American Spinal Injury Association (ASIA) assessment, only two patients improved in sensitivity, but clinical improvement in neurogenic bowel dysfunction was observed in four patients and three patients described improvement in bladder dysfunction. Spasms reduced in two of the five patients who had them previous to cell therapy, and spasticity was improved in the other two patients. Three patients had neuropathic pain before treatment, and it was reduced or disappeared completely during the study. Only two adverse events ocurred, without relation to the cell therapy. CONCLUSIONS Cell therapy can be considered as a new alternative to the treatment of post-traumatic syringomyelia, achieving reduction of syrinx and clinical improvements in individual patients.
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Affiliation(s)
- Jesús Vaquero
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain.
| | - Mercedes Zurita
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Miguel A Rico
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Concepcion Aguayo
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Cecilia Fernandez
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Gregorio Rodriguez-Boto
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Esperanza Marin
- Clinical Neurophysiology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Noemi Tapiador
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Marta Sevilla
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Joaquin Carballido
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - David Vazquez
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | | | | | - Miguel Leon
- Service of Coloproctology, Hospital General de Villalba, Madrid, Spain
| | - Ignacio Valverde
- Service of Coloproctology, Hospital General de Villalba, Madrid, Spain
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Sevilla M, Al-Jumialy ASM, Fuertes AB, Mokaya R. Optimization of the Pore Structure of Biomass-Based Carbons in Relation to Their Use for CO 2 Capture under Low- and High-Pressure Regimes. ACS Appl Mater Interfaces 2018; 10:1623-1633. [PMID: 29261288 DOI: 10.1021/acsami.7b10433] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
A versatile chemical activation approach for the fabrication of sustainable porous carbons with a pore network tunable from micro- to hierarchical micro-/mesoporous is hereby presented. It is based on the use of a less corrosive and less toxic chemical, i.e., potassium oxalate, rather than the widely used KOH. The fabrication procedure is exemplified for glucose as precursor, although it can be extended to other biomass derivatives (saccharides) with similar results. When potassium oxalate alone is used as activating agent, highly microporous carbons are obtained (SBET ≈ 1300-1700 m2 g-1). When a melamine-mediated activation process is used, hierarchical micro-/mesoporous carbons with surface areas as large as 3500 m2 g-1 are obtained. The microporous carbons are excellent adsorbents for CO2 capture at low pressure and room temperature, able to adsorb 4.2-4.5 mmol CO2 g-1 at 1 bar and 1.1-1.4 mmol CO2 g-1 at 0.15 bar. However, the micro-/mesoporous carbons provide record-high room temperature CO2 uptakes at 30 bar of 32-33 mmol g-1 CO2 and 44-49 mmol g-1 CO2 at 50 bar. The findings demonstrate the key relevance of pore size in CO2 capture, with narrow micropores having the leading role at pressures <1 bar and supermicropores/small mesopores at high pressures. In this regard, the fabrication strategy presented here allows fine-tuning of the pore network to maximize both the overall CO2 uptake and the working capacity at any target pressure.
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Affiliation(s)
- Marta Sevilla
- Instituto Nacional del Carbón (CSIC) , Francisco Pintado Fe 26, Oviedo 33011, Spain
| | - Abdul Salam M Al-Jumialy
- School of Chemistry, University of Nottingham , University Park, NG7 2RD Nottingham, United Kingdom
| | - Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC) , Francisco Pintado Fe 26, Oviedo 33011, Spain
| | - Robert Mokaya
- School of Chemistry, University of Nottingham , University Park, NG7 2RD Nottingham, United Kingdom
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Vaquero J, Zurita M, Rico MA, Bonilla C, Aguayo C, Fernández C, Tapiador N, Sevilla M, Morejón C, Montilla J, Martínez F, Marín E, Bustamante S, Vázquez D, Carballido J, Rodríguez A, Martínez P, García C, Ovejero M, Fernández MV. Repeated subarachnoid administrations of autologous mesenchymal stromal cells supported in autologous plasma improve quality of life in patients suffering incomplete spinal cord injury. Cytotherapy 2017; 19:349-359. [PMID: 28089079 DOI: 10.1016/j.jcyt.2016.12.002] [Citation(s) in RCA: 85] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2016] [Revised: 12/12/2016] [Accepted: 12/13/2016] [Indexed: 12/26/2022]
Abstract
BACKGROUND AIMS Cell therapy with mesenchymal stromal cells (MSCs) offers new hope for patients suffering from spinal cord injury (SCI). METHODS Ten patients with established incomplete SCI received four subarachnoid administrations of 30 × 106 autologous bone marrow MSCs, supported in autologous plasma, at months 1, 4, 7 and 10 of the study, and were followed until the month 12. Urodynamic, neurophysiological and neuroimaging studies were performed at months 6 and 12, and compared with basal studies. RESULTS Variable improvement was found in the patients of the series. All of them showed some degree of improvement in sensitivity and motor function. Sexual function improved in two of the eight male patients. Neuropathic pain was present in four patients before treatment; it disappeared in two of them and decreased in another. Clear improvement in bladder and bowel control were found in all patients suffering previous dysfunction. Before treatment, seven patients suffered spasms, and two improved. Before cell therapy, nine patients suffered variable degree of spasticity, and 3 of them showed clear decrease at the end of follow-up. At this time, nine patients showed infra-lesional electromyographic recordings suggesting active muscle reinnervation, and eight patients showed improvement in bladder compliance. After three administrations of MSCs, mean values of brain-derived neurotrophic factor, glial-derived neurotrophic factor, ciliary neurotrophic factor, and neurotrophin 3 and 4 showed slight increases compared with basal levels, but without statistically significant difference. CONCLUSIONS Administration of repeated doses of MSCs by subarachnoid route is a well-tolerated procedure that is able to achieve progressive and significant improvement in the quality of life of patients suffering incomplete SCI.
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Affiliation(s)
- Jesús Vaquero
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain; Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain.
| | - Mercedes Zurita
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Miguel A Rico
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Celia Bonilla
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Concepción Aguayo
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Cecilia Fernández
- Neurosurgery Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Noemí Tapiador
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Marta Sevilla
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Carlos Morejón
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Jesús Montilla
- Rehabilitation Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Francisco Martínez
- Clinical Neurophysiology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Esperanza Marín
- Clinical Neurophysiology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Salvador Bustamante
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - David Vázquez
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Joaquín Carballido
- Urology Service, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Alicia Rodríguez
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Paula Martínez
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | - Coral García
- Neuroimmunology Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
| | | | - Marta V Fernández
- Neuroscience Research Unit, University Hospital Puerta de Hierro-Majadahonda, Autonomous University, Madrid, Spain
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Sevilla M, Ferrero GA, Fuertes AB. Aqueous Dispersions of Graphene from Electrochemically Exfoliated Graphite. Chemistry 2016; 22:17351-17358. [PMID: 27775199 DOI: 10.1002/chem.201603321] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 09/07/2016] [Indexed: 11/07/2022]
Abstract
A facile and environmentally friendly synthetic strategy for the production of stable and easily processable dispersions of graphene in water is presented. This strategy represents an alternative to classical chemical exfoliation methods (for example the Hummers method) that are more complex, harmful, and dangerous. The process is based on the electrochemical exfoliation of graphite and includes three simple steps: 1) the anodic exfoliation of graphite in (NH4 )2 SO4 , 2) sonication to separate the oxidized graphene sheets, and 3) reduction of oxidized graphene to graphene. The procedure makes it possible to convert around 30 wt % of the initial graphite into graphene with short processing times and high yields. The graphene sheets are well dispersed in water, have a carbon/oxygen atomic ratio of 11.7, a lateral size of about 0.5-1 μm, and contain only a few graphene layers, most of which are bilayer sheets. The processability of this type of aqueous dispersion has been demonstrated in the fabrication of macroscopic graphene structures, such as graphene aerogels and graphene films, which have been successfully employed as absorbents or as electrodes in supercapacitors, respectively.
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Affiliation(s)
- Marta Sevilla
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo, 33080, Spain
| | | | - Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo, 33080, Spain
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Sevilla M, Fuertes AB. A Green Approach to High-Performance Supercapacitor Electrodes: The Chemical Activation of Hydrochar with Potassium Bicarbonate. ChemSusChem 2016; 9:1880-8. [PMID: 27273466 DOI: 10.1002/cssc.201600426] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Indexed: 05/11/2023]
Abstract
Sustainable synthesis schemes for the production of porous carbons with appropriate textural properties for use as supercapacitor electrodes are in high demand. In this work a greener option to the widely used but corrosive KOH is proposed for the production of highly porous carbons. Hydrochar products are used as carbon precursors. It is demonstrated that a mild alkaline potassium salt such as potassium bicarbonate is very effective to generate porosity in hydrochar to lead to materials with large surface areas (> 2000 m(2) g(-1) ) and a tunable pore size distribution. Furthermore, the use of KHCO3 instead of KOH gives rise to a significant 10 % increase in the yield of activated carbon, and the spherical morphology of hydrochar is retained, which translates into better packing properties and reduced ion diffusion distances. These features lead to a supercapacitor performance that can compete with, and even surpass, that of KOH-activated hydrochar in a variety of electrolytes.
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Affiliation(s)
- Marta Sevilla
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo, 33080, Spain.
| | - Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo, 33080, Spain
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Ferrero GA, Preuss K, Marinovic A, Jorge AB, Mansor N, Brett DJL, Fuertes AB, Sevilla M, Titirici MM. Fe-N-Doped Carbon Capsules with Outstanding Electrochemical Performance and Stability for the Oxygen Reduction Reaction in Both Acid and Alkaline Conditions. ACS Nano 2016; 10:5922-32. [PMID: 27214056 DOI: 10.1021/acsnano.6b01247] [Citation(s) in RCA: 165] [Impact Index Per Article: 20.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
High surface area N-doped mesoporous carbon capsules with iron traces exhibit outstanding electrocatalytic activity for the oxygen reduction reaction in both alkaline and acidic media. In alkaline conditions, they exhibit more positive onset (0.94 V vs RHE) and half-wave potentials (0.83 V vs RHE) than commercial Pt/C, while in acidic media the onset potential is comparable to that of commercial Pt/C with a peroxide yield lower than 10%. The Fe-N-doped carbon catalyst combines high catalytic activity with remarkable performance stability (3500 cycles between 0.6 and 1.0 V vs RHE), which stems from the fact that iron is coordinated to nitrogen. Additionally, the newly developed electrocatalyst is unaffected by the methanol crossover effect in both acid and basic media, contrary to commercial Pt/C. The excellent catalytic behavior of the Fe-N-doped carbon, even in the more relevant acid medium, is attributable to the combination of chemical functions (N-pyridinic, N-quaternary, and Fe-N coordination sites) and structural properties (large surface area, open mesoporous structure, and short diffusion paths), which guarantees a large number of highly active and fully accessible catalytic sites and rapid mass-transfer kinetics. Thus, this catalyst represents an important step forward toward replacing Pt catalysts with cheaper alternatives. In this regard, an alkaline anion exchange membrane fuel cell was assembled with Fe-N-doped mesoporous carbon capsules as the cathode catalyst to provide current and power densities matching those of a commercial Pt/C, which indicates the practical applicability of the Fe-N-carbon catalyst.
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Affiliation(s)
| | | | | | - Ana Belen Jorge
- Department of Chemistry, University College London , WC1H 0AJ London, U.K
| | - Noramalina Mansor
- Department of Chemical Engineering, University College London , WC1E 7JE London, U.K
| | - Dan J L Brett
- Department of Chemical Engineering, University College London , WC1E 7JE London, U.K
| | - Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC) , P.O. Box 73, Oviedo 33080, Spain
| | - Marta Sevilla
- Instituto Nacional del Carbón (CSIC) , P.O. Box 73, Oviedo 33080, Spain
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Alatalo SM, Pileidis F, Mäkilä E, Sevilla M, Repo E, Salonen J, Sillanpää M, Titirici MM. Versatile Cellulose-Based Carbon Aerogel for the Removal of Both Cationic and Anionic Metal Contaminants from Water. ACS Appl Mater Interfaces 2015; 7:25875-83. [PMID: 26540557 DOI: 10.1021/acsami.5b08287] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Hydrothermal carbonization of cellulose in the presence of the globular protein ovalbumin leads to the formation of nitrogen-doped carbon aerogel with a fibrillar continuous carbon network. The protein plays here a double role: (i) a natural source of nitrogen functionalities (2.1 wt %) and (ii) structural directing agent (S(BET) = 38 m(2)/g). The applicability in wastewater treatment, namely, for heavy metal removal, was examined through adsorption of Cr(VI) and Pb(II) ion solely and in a mixed bicomponent aqueous solutions. This cellulose-based carbogel shows an enhanced ability to remove both Cr(VI) (∼68 mg/g) and Pb(II) (∼240 mg/g) from the targeted solutions in comparison to other carbon materials reported in the literature. The presence of competing ions showed little effect on the adsorption efficiency toward Cr(VI) and Pb(II).
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Affiliation(s)
- Sara-Maaria Alatalo
- Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology , Sammonkatu 12, FI-50130 Mikkeli, Finland
| | - Filoklis Pileidis
- School of Materials Science and Engineering, Queen Mary University of London , Mile End Road, E1 4NS, London, United Kingdom
- Materials Research Institute, Queen Mary University of London , Mile End Road, E1 4NS, London, United Kingdom
| | - Ermei Mäkilä
- Laboratory of Industrial Physics, Department of Physics and Astronomy, University of Turku , FI-20014 Turku, Finland
| | - Marta Sevilla
- Instituto Nacional del Carbón (CSIC) , P.O. Box 73, 33080 OVIEDO, Spain
| | - Eveliina Repo
- Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology , Sammonkatu 12, FI-50130 Mikkeli, Finland
| | - Jarno Salonen
- Laboratory of Industrial Physics, Department of Physics and Astronomy, University of Turku , FI-20014 Turku, Finland
| | - Mika Sillanpää
- Laboratory of Green Chemistry, Department of Chemistry, Lappeenranta University of Technology , Sammonkatu 12, FI-50130 Mikkeli, Finland
| | - Maria-Magdalena Titirici
- School of Materials Science and Engineering, Queen Mary University of London , Mile End Road, E1 4NS, London, United Kingdom
- Materials Research Institute, Queen Mary University of London , Mile End Road, E1 4NS, London, United Kingdom
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Abstract
Supercapacitor technology is an extremely timely area of research with fierce international competition to develop cost-effective, environmentally friendlier EC electrode materials that have real world application. Herein, nitrogen-doped carbons with large specific surface area, optimized micropore structure and surface chemistry have been prepared by means of an environmentally sound hydrothermal carbonization process using defatted soybean (i.e., Soybean meal), a widely available and cost-effective protein-rich biomass, as precursor followed by a chemical activation step. When tested as supercapacitor electrodes in aqueous electrolytes (i.e. H2SO4 and Li2SO4), they demonstrate excellent capacitive performance and robustness, with high values of specific capacitance in both gravimetric (250-260 and 176 F g(-1) in H2SO4 and Li2SO4 respectively) and volumetric (150-210 and 102 F cm(-3) in H2SO4 and Li2SO4 respectively) units, and remarkable rate capability (>60% capacitance retention at 20 A g(-1) in both media). Interestingly, when Li2SO4 is used, the voltage window is extended up to 1.7 V (in contrast to 1.1 V in H2SO4). Thus, the amount of energy stored is increased by 50% compared to H2SO4 electrolyte, enabling this environmentally sound Li2SO4-based supercapacitor to deliver ~12 Wh kg(-1) at a high power density of ~2 kW kg(-1).
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Affiliation(s)
- G. A. Ferrero
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain
| | - A. B. Fuertes
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain
| | - M. Sevilla
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain
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Fuertes AB, Sevilla M. Superior capacitive performance of hydrochar-based porous carbons in aqueous electrolytes. ChemSusChem 2015; 8:1049-1057. [PMID: 25677575 DOI: 10.1002/cssc.201403267] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Indexed: 06/04/2023]
Abstract
Biomass-based highly porous carbons with excellent performances in aqueous electrolyte-based supercapacitors have been developed. The synthesis of these materials is based on the chemical activation of biomass-based hydrochar. The addition of melamine to the activation mixture leads to porous carbons with a porosity consisting of micropores/small mesopores. Furthermore, melamine promotes the introduction of nitrogen heteroatoms in the carbon framework, along with abundant oxygen functionalities, to improve the wettability. The materials produced in the presence or absence of melamine exhibit high specific capacitances in aqueous electrolytes (>270 F g(-1) in H2 SO4 and >190 F g(-1) in Li2SO4). Additionally, the mesopores present in the melamine-based micro-/mesoporous carbons notably improve the ion-transport kinetics, especially in Li2SO4. Furthermore, in Li2SO4, they remain stable up to a cell voltage of 1.6 V; thus exhibiting superior energy and power characteristics than those in H2 SO4.
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Affiliation(s)
- Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080 (Spain)
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Fuertes AB, Sevilla M. Hierarchical microporous/mesoporous carbon nanosheets for high-performance supercapacitors. ACS Appl Mater Interfaces 2015; 7:4344-4353. [PMID: 25675347 DOI: 10.1021/am508794f] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
A straightforward one-pot approach for the synthesis of highly porous carbon nanosheets with an excellent performance as supercapacitor electrodes is presented. The procedure is based on the carbonization of an organic salt (i.e., sodium gluconate) at a temperature in the range of 700-900 °C. The carbon nanosheets have a large aspect ratio (length/thickness ≈ 10(2)-10(3)), a thickness within the range of 40-200 nm, high BET surface areas (SBET) of up to 1390 m(2) g(-1), and a porosity with a hierarchical organization in the micropore-mesopore range. Importantly, via an additional activation step, the textural properties can be substantially enhanced (SBET up to 1890 m(2) g(-1)). Both the nanosheet morphology (short diffusional paths) and the hierarchical microporous/mesoporous pore structure allow the rapid transport of ions throughout the carbonaceous matrix, leading to excellent electrochemical performance. Thus, the hierarchical nanosheets exhibit specific capacitances of up to 140 F g(-1) at an ultrahigh discharge current of 150 A g(-1) in 1 M H2SO4 and 100 F g(-1) at 120 A g(-1) in 1 M TEABF4/AN. The maximum specific power recorded in an aqueous electrolyte is ∼ 20-30 kW kg(-1) and ∼ 90-110 kW kg(-1) in an organic electrolyte. These promising power characteristics are accompanied by excellent cycling stability.
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Affiliation(s)
- Antonio B Fuertes
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, Oviedo 33080, Spain
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Briscoe J, Marinovic A, Sevilla M, Dunn S, Titirici M. Biomass-Derived Carbon Quantum Dot Sensitizers for Solid-State Nanostructured Solar Cells. Angew Chem Int Ed Engl 2015; 54:4463-8. [DOI: 10.1002/anie.201409290] [Citation(s) in RCA: 266] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 11/28/2014] [Indexed: 11/11/2022]
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Briscoe J, Marinovic A, Sevilla M, Dunn S, Titirici M. Aus Biomasse hergestellte Kohlenstoff-Quantenpunkt-Sensibilisatoren für nanostrukturierte Festkörper-Solarzellen. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201409290] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Sevilla M, Yu L, Ania CO, Titirici MM. Supercapacitive Behavior of Two Glucose-Derived Microporous Carbons: Direct Pyrolysis versus Hydrothermal Carbonization. ChemElectroChem 2014. [DOI: 10.1002/celc.201402233] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Sevilla M, Fuertes AB. Direct synthesis of highly porous interconnected carbon nanosheets and their application as high-performance supercapacitors. ACS Nano 2014; 8:5069-78. [PMID: 24731137 DOI: 10.1021/nn501124h] [Citation(s) in RCA: 169] [Impact Index Per Article: 16.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
An easy, one-step procedure is proposed for the synthesis of highly porous carbon nanosheets with an excellent performance as supercapacitor electrodes. The procedure is based on the carbonization of an organic salt, i.e., potassium citrate, at a temperature in the 750-900 °C range. In this way, carbon particles made up of interconnected carbon nanosheets with a thickness of <80 nm are obtained. The porosity of the carbon nanosheets consists essentially of micropores distributed in two pore systems of 0.7-0.85 nm and 0.95-1.6 nm. Importantly, the micropore sizes of both systems can be enlarged by simply increasing the carbonization temperature. Furthermore, the carbon nanosheets possess BET surface areas in the ∼1400-2200 m(2) g(-1) range and electronic conductivities in the range of 1.7-7.4 S cm(-1) (measured at 7.1 MPa). These materials behave as high-performance supercapacitor electrodes in organic electrolyte and exhibit an excellent power handling ability and a superb robustness over long-term cycling. Excellent results were obtained with the supercapacitor fabricated from the material synthesized at 850 °C in terms of both gravimetric and volumetric energy and power densities. This device was able to deliver ∼13 Wh kg(-1) (5.2 Wh L(-1)) at an extremely high power density of 78 kW kg(-1) (31 kW L(-1)) and ∼30 Wh kg(-1) (12 Wh L(-1)) at a power density of 13 kW kg(-1) (5.2 kW L(-1)) (voltage range of 2.7 V).
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Affiliation(s)
- Marta Sevilla
- Instituto Nacional del Carbón (CSIC) , P.O. Box 73, Oviedo 33080, Spain
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Sevilla M, Parra JB, Fuertes AB. Assessment of the role of micropore size and N-doping in CO2 capture by porous carbons. ACS Appl Mater Interfaces 2013; 5:6360-8. [PMID: 23789916 DOI: 10.1021/am401423b] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The role of micropore size and N-doping in CO2 capture by microporous carbons has been investigated by analyzing the CO2 adsorption properties of two types of activated carbons with analogous textural properties: (a) N-free carbon microspheres and (b) N-doped carbon microspheres. Both materials exhibit a porosity made up exclusively of micropores ranging in size between <0.6 nm in the case of the pristine materials and up to 1.6 nm for the highly activated carbons (47% burnoff). The N-doped carbons possess ~3 wt % of N heteroatoms that are incorporated into several types of functional groups (i.e., pyrrole/pyridone, pyridine, quaternary, and pyridine-N-oxide). Under conventional operation conditions (i.e., T ~ 0-25 °C and P(CO2) ~ 0-1 bar), CO2 adsorption proceeds via a volume-filling mechanism, the size limit for volume-filling being ~0.7-0.8 nm. Under these circumstances, the adsorption of CO2 by nonfunctionalized porous carbons is mainly determined by the volume of the micropores with a size below 0.8 nm. It was also observed that the CO2 capture capacities of undoped and N-doped carbons are analogous which shows that the nitrogen functionalities present in these N-doped samples do not influence CO2 adsorption. Taking into account the temperature invariance of the characteristic curve postulated by the Dubinin theory, we show that CO2 uptakes can be accurately predicted by using the adsorption data measured at just one temperature.
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Affiliation(s)
- Marta Sevilla
- Instituto Nacional del Carbón (CSIC), Oviedo, Spain.
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Falco C, Sieben JM, Brun N, Sevilla M, van der Mauelen T, Morallón E, Cazorla-Amorós D, Titirici MM. Hydrothermal carbons from hemicellulose-derived aqueous hydrolysis products as electrode materials for supercapacitors. ChemSusChem 2013; 6:374-382. [PMID: 23319452 DOI: 10.1002/cssc.201200817] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Indexed: 06/01/2023]
Abstract
Acid pretreatment of lignocellulosic biomass, required for bioethanol production, generates large amounts of by-products, such as lignin and hydrolyzed hemicellulose fractions, which have found so far very limited applications. In this work, we demonstrate how the recovered hemicellulose hydrolysis products can be effectively utilized as a precursor for the synthesis of functional carbon materials through hydrothermal carbonization (HTC). The morphology and chemical structure of the synthesized HTC carbons are thoroughly characterized to highlight their similarities with glucose-derived HTC carbons. Furthermore, two routes for introducing porosity within the HTC carbon structure are presented: i) silica nanoparticle hard-templating, which is shown to be a viable method for the synthesis of carbonaceous hollow spheres; and ii) KOH chemical activation. The synthesized activated carbons (ACs) show an extremely high porosity (pore volume≈1.0 cm(3) g(-1)) mostly composed of micropores (90 % of total pore volume). Because of their favorable textural properties, the ACs are further tested as electrodes for supercapacitors, yielding very promising results (300 F g(-1) at 250 mA g(-1)) and confirming the high suitability of KOH-activated HTC carbons derived from spruce and corncob hydrolysis products as materials for electric double layer supercapacitors.
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Affiliation(s)
- Camillo Falco
- IASS - Institute for Advanced Sustainability Studies, BerlinerStrasse 130, 14467, Potsdam, Germany.
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Sevilla M, Yu L, Fellinger TP, Fuertes AB, Titirici MM. Polypyrrole-derived mesoporous nitrogen-doped carbons with intrinsic catalytic activity in the oxygen reduction reaction. RSC Adv 2013. [DOI: 10.1039/c3ra41719k] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Falco C, Sevilla M, White RJ, Rothe R, Titirici MM. Renewable nitrogen-doped hydrothermal carbons derived from microalgae. ChemSusChem 2012; 5:1834-1840. [PMID: 22544481 DOI: 10.1002/cssc.201200022] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Indexed: 05/31/2023]
Abstract
Nitrogen-doped carbon materials are synthesized via an effective, sustainable, and green one-step route based on the hydrothermal carbonization of microalgae with high nitrogen content (ca. 11 wt %). The addition of the monosaccharide glucose to the reaction mixture is found to be advantageous, enhancing the fixation of nitrogen in the synthesized carbons, resulting in materials possessing nitrogen content in excess of 7 wt %, and leading to promising reaction yields. Increasing the amount of glucose leads to a higher nitrogen retention in the carbons, which suggests co-condensation of the microalgae and glucose-derived degradation/hydrolysis products via Maillard-type cascade reactions, yielding nitrogen-containing aromatic heterocycles (e.g., pyrroles) as confirmed by several analytical techniques. Increasing the HTC processing temperature leads to a further aromatization of the chemical structure of the HTC carbon and the formation of increasingly more condensed nitrogen-containing functional motifs (i.e., pyridinic and quaternary nitrogen).
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Affiliation(s)
- Camillo Falco
- Department of Colloid Chemistry, Max Planck Institute for Colloids and Interfaces, Am Muhlenberg 1, 14476 Potsdam, Germany
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Ponrouch A, Sevilla M, Marchante E, Palacín MR, Fuertes AB. Facile synthesis of graphitic carbons decorated with SnO2 nanoparticles and their application as high capacity lithium-ion battery anodes. J APPL ELECTROCHEM 2012. [DOI: 10.1007/s10800-012-0467-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Fuertes AB, Valle-Vigón P, Sevilla M. One-step synthesis of silica@resorcinol–formaldehyde spheres and their application for the fabrication of polymer and carbon capsules. Chem Commun (Camb) 2012; 48:6124-6. [DOI: 10.1039/c2cc32552g] [Citation(s) in RCA: 178] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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Sevilla M, Mokaya R. Activation of carbide-derived carbons: a route to materials with enhanced gas and energy storage properties. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c0jm03347b] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Fernández-García MP, Gorria P, Sevilla M, Fuertes AB, Boada R, Chaboy J, Aquilanti G, Blanco JA. Co nanoparticles inserted into a porous carbon amorphous matrix: the role of cooling field and temperature on the exchange bias effect. Phys Chem Chem Phys 2011; 13:927-32. [DOI: 10.1039/c0cp00396d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Maciá-Agulló JA, Sevilla M, Diez MA, Fuertes AB. Synthesis of carbon-based solid acid microspheres and their application to the production of biodiesel. ChemSusChem 2010; 3:1352-1354. [PMID: 21069661 DOI: 10.1002/cssc.201000308] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
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Affiliation(s)
- Marta Sevilla
- Departamento de Química de Materiales, Instituto Nacional del Carbón (CSIC), P.O. Box 73, 33080 Oviedo, Spain
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Sevilla M, Sanchís C, Valdés-Solís T, Morallón E, Fuertes A. Highly dispersed platinum nanoparticles on carbon nanocoils and their electrocatalytic performance for fuel cell reactions. Electrochim Acta 2009. [DOI: 10.1016/j.electacta.2008.10.042] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Rebolledo AF, Fuertes AB, Gonzalez-Carreño T, Sevilla M, Valdes-Solis T, Tartaj P. Signatures of clustering in superparamagnetic colloidal nanocomposites of an inorganic and hybrid nature. Small 2008; 4:254-261. [PMID: 18203231 DOI: 10.1002/smll.200700515] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
The individual and co-operative properties of inorganic and hybrid superparamagnetic colloidal nanocomposites that satisfy all the requirements of magnetic carriers in the biosciences and/or catalysis fields are been studied. Essential to the success of this study is the selection of suitable synthetic routes (aerosol and nanocasting) that allow the preparation of materials with different matrix characteristics (carbon, silica, and polymers with controlled porosity). These materials present magnetic properties that depend on the average particle size and the degree of polydispersity. Finally, the analysis of the co-operative behavior of samples allows for the detection of signatures of clustering, which are closely related to the textural characteristics of samples and the methodology used to produce the magnetic carriers.
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Affiliation(s)
- Aldo F Rebolledo
- Instituto de Ciencia de Materiales de Madrid (CSIC), Campus Universitario de Cantoblanco, 28049 Madrid, Spain
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Sevilla M, Salinas Martínez-de Lecea C, Valdés-Solís T, Morallón E, Fuertes AB. Solid-phase synthesis of graphitic carbon nanostructures from iron and cobalt gluconates and their utilization as electrocatalyst supports. Phys Chem Chem Phys 2008; 10:1433-42. [PMID: 18309400 DOI: 10.1039/b714924g] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a novel and facile synthesis methodology for obtaining graphitic carbon structures from Fe(II) and Co(II) gluconates. The formation of graphitic carbon can be carried out in only one step by means of heat treatment of these organic salts at a temperature of 900 degrees C or 1000 degrees C under inert atmosphere. This process consists of the following steps: (a) pyrolysis of the organic gluconate and its transformation to amorphous carbon, (b) conversion of Fe(2+) and Co(2+) ions to Fe(2)O(3) and CoO and their subsequent reduction to metallic nanoparticles by the carbon and (c) conversion of a fraction of formed amorphous carbon to graphitic structures by Fe and Co nanoparticles that act as catalysts in the graphitization process. The removal of the amorphous carbon and metallic nanoparticles by means of oxidative treatment (KMnO(4) in an acid solution) allows graphitic carbon nanostructures (GCNs) to be selectively recovered. The GCNs thus obtained (i.e. nanocapsules and nanopipes) have a high crystallinity as evidenced by TEM/SAED, XRD and Raman analysis. In addition, we used these GCNs as supports for platinum nanoparticles, which were well dispersed (mean Pt size approximately 2.5-3.2 nm). Most electrocatalysts prepared in this way have a high electrocatalytical surface area, up to 90 m(2) g(-1) Pt, and exhibit high catalytic activities toward methanol electrooxidation.
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Affiliation(s)
- M Sevilla
- Instituto Nacional del Carbón (CSIC), P.O. Box 73, 33080-Oviedo, Spain
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Vilar E, Martinez M, Alonso V, Sevilla M, Sastre J, Castellano D, Marazuela M, Diaz J, Villabona C, Salazar R. Influence of first line treatment in the 5 (5yS) and 10-year (10yS) survival outcomes of patients with gastroenteropancreatic neuroendocrine tumors (GNETs): 2001–2005 Spanish task force GNET group. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.14058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
14058 Background: Data on incidence, morbidity and mortality of GNETs is limited due to the low frequency of these tumors. However this survival data is critical to design studies with new agents. Methods: Data was obtained from medical records of 262 patients with GNETs and centralized in an online registry at www.retegep.net . Among the study parameters were histology, localization, stage, diagnostic workup, 1st line and subsequent treatments, 5yS and 10yS for the whole dataset and for different stages, tumor types and 1st line systemic treatment. Results: Mean age 58, 58% male. Primary tumors: 49% Carcinoids (C), 19% non-functioning pancreatic tumors (PT), 9% insulinomas, 6% gastrinomas and 8% unknown primary. Localizations: midgut (36%), head (17%) and body of pancreas (10%). Functioning symptoms led to diagnosis in 38% of cases. 4% were associated to MEN1. Stage at diagnosis was advanced (Adv) in 46%, localised (L) in 30% and locorregional (LR) in 13% (unknown in 11%). Diagnostic workup were CT Scan (84%), Octreoscan (52%) and US (52%) and serum hormone tests (65%). Treatments for Adv disease included somatostatin analogues (SA) (47%), surgery (S) (43%), chemotherapy (CT) (35%) and interferon (IFN) (34%), embolization (7%) and radiofrequency ablation (3%). 5yS and 10yS for the whole group was 61.6% (SD: 5.2%) and 49.8% (SD: 7.7%) respectively. 5yS and 10yS for the L/LR and Adv stages were 78.1% (SD: 7.3%) and 71% (SD: 10%), and 48.9% (SD: 7.7%) and 29% (SD: 12.4%), respectively. LR PT and C had similar 5 and 10yS but Adv PT did worse than Adv C (5yS of 36.2% and 61.1%, respectively). 1st line systemic treatment for LR and Adv disease (n=90) included SA (39%), CT (34.4%), IFN (5.6%), combinations of SA+IFN (13.3%), A+CT (4.4%) and other combinations (3.3%), with a 10yS rate of 69%, 79%, 50%, 89%, 66% and 50%, respectively. Adv PT perform worse than C regardless of treatment choice. As second line systemic treatment (n=43) 30% received SA, 30% CT, 26% inmunotherapy and 14% combinations. Conclusions: An extensive use of systemic therapy and a scarce use of non-surgical LR treatments is observed in the Adv stages. Choice of 1st line systemic treatment does not seem to influence survival outcomes. No significant financial relationships to disclose.
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Affiliation(s)
- E. Vilar
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - M. Martinez
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - V. Alonso
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - M. Sevilla
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - J. Sastre
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - D. Castellano
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - M. Marazuela
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - J. Diaz
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - C. Villabona
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
| | - R. Salazar
- Vall d’Hebron University Hospital, Barcelona, Spain; Hospital de Basurto, Vizcaya, Spain; Hospital Miguel Servet, Zaragoza, Spain; Hospital Virgen de la Victoria, Málaga, Spain; Hospital Clinico Universitario San Carlos, Madrid, Spain; Hospital 12 de Octubre, Madrid, Spain; Hospital de La Princesa, Madrid, Spain; Ciutat Sanitaria I Universitaria de Bellvitge, Barcelona, Spain; Hospital Duran I Reynals, Barcelona, Spain
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Cigarrán S, Coronel F, Torrente J, Sevilla M, Baylón J. Risk of Inadequate Dialysis Dose in Hemodialysis Patients with High Watson Volume. A Warning. Hemodial Int 2004. [DOI: 10.1111/j.1492-7535.2004.0085o.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Cigarrán S, Coronel F, Torrente J, Sevilla M, Baylón J. Dialysis Dose Parameters. How Much We Can Improve Them in Our Clinical Practice? Role of Online Conductivity Monitor. Hemodial Int 2004. [DOI: 10.1111/j.1492-7535.2004.0085n.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Cigarrán S, Coronel F, Torrente J, Sevilla M, Baylón J. Accuracy of Online Conductivity Monitor Compared with Daugirdas (dPVV/Kt/V) Model. Use in the Clinical Field. Hemodial Int 2004. [DOI: 10.1111/j.1492-7535.2004.0085m.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sevilla M, Burris RH, Gunapala N, Kennedy C. Comparison of benefit to sugarcane plant growth and 15N2 incorporation following inoculation of sterile plants with Acetobacter diazotrophicus wild-type and Nif- mutants strains. Mol Plant Microbe Interact 2001; 14:358-366. [PMID: 11277433 DOI: 10.1094/mpmi.2001.14.3.358] [Citation(s) in RCA: 134] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The ability of the nitrogen-fixing bacterial endophyte Acetobacter diazotrophicus strain PAl5 to enhance the growth of sugarcane SP70-1143 was evaluated in the growth chamber, greenhouse, and field by comparing plants inoculated with wild-type and Nif mutant MAd3A in two independent experiments. The wild-type and Nif mutant strains colonized sugarcane plants equally and persisted in mature plants. In N-deficient conditions, sugarcane plants inoculated with A. diazotrophicus PAl5 generally grew better and had a higher total N content 60 days after planting than did plants inoculated with mutant MAd3A or uninoculated plants. These results indicate that the transfer of fixed N from A. diazotrophicus to sugarcane might be a significant mechanism for plant growth promotion in this association. When N was not limiting, growth enhancement was observed in plants inoculated with either wild-type or Nif- mutants, suggesting the additional effect of a plant growth promoting factor provided by A. diazotrophicus. A 15N2 incorporation experiment demonstrated that A. diazotrophicus wild-type strains actively fixed N2 inside sugarcane plants, whereas the Nif- mutants did not.
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Affiliation(s)
- M Sevilla
- Department of Plant Pathology, University of Arizona, Tucson 85721, USA
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Lee S, Reth A, Meletzus D, Sevilla M, Kennedy C. Characterization of a major cluster of nif, fix, and associated genes in a sugarcane endophyte, Acetobacter diazotrophicus. J Bacteriol 2000; 182:7088-91. [PMID: 11092875 PMCID: PMC94840 DOI: 10.1128/jb.182.24.7088-7091.2000] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2000] [Accepted: 09/23/2000] [Indexed: 11/20/2022] Open
Abstract
A major 30.5-kb cluster of nif and associated genes of Acetobacter diazotrophicus (syn. Gluconacetobacter diazotrophicus), a nitrogen-fixing endophyte of sugarcane, was sequenced and analyzed. This cluster represents the largest assembly of contiguous nif-fix and associated genes so far characterized in any diazotrophic bacterial species. Northern blots and promoter sequence analysis indicated that the genes are organized into eight transcriptional units. The overall arrangement of genes is most like that of the nif-fix cluster in Azospirillum brasilense, while the individual gene products are more similar to those in species of Rhizobiaceae or in Rhodobacter capsulatus.
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Affiliation(s)
- S Lee
- Department of Plant Pathology, University of Arizona, Tucson, Arizona 85721, USA
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