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Santa-Cruz LA, Mantovi PS, Loguercio LF, Galvão RA, Navarro M, Passos STA, Neto BAD, Tavares FC, Torresi RM, Machado G. Gel Biopolymer Electrolytes Based on Saline Water and Seaweed to Support the Large-Scale Production of Sustainable Supercapacitors. CHEMSUSCHEM 2024; 17:e202300884. [PMID: 37707501 DOI: 10.1002/cssc.202300884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 09/11/2023] [Accepted: 09/12/2023] [Indexed: 09/15/2023]
Abstract
Climate change and the demand for clean energy have challenged scientists worldwide to produce/store more energy to reduce carbon emissions. This work proposes a conductive gel biopolymer electrolyte to support the sustainable development of high-power aqueous supercapacitors. The gel uses saline water and seaweed as sustainable resources. Herein, a biopolymer agar-agar, extracted from red algae, is modified to increase gel viscosity up to 17-fold. This occurs due to alkaline treatment and an increase in the concentration of the agar-agar biopolymer, resulting in a strengthened gel with cohesive superfibres. The thermal degradation and agar modification mechanisms are explored. The electrolyte is applied to manufacture sustainable and flexible supercapacitors with satisfactory energy density (0.764 Wh kg-1 ) and power density (230 W kg-1 ). As an electrolyte, the aqueous gel promotes a long device cycle life (3500 cycles) for 1 A g-1 , showing good transport properties and low cost of acquisition and enabling the supercapacitor to be manufactured outside a glove box. These features decrease the cost of production and favor scale-up. To this end, this work provides eco-friendly electrolytes for the next generation of flexible energy storage devices.
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Mosquera N, Chauque S, Torresi RM, Calderón JA. Energy Storage Enhancement of LixMn1.8Ti0.2O4@N-doped graphene oxide in Organic and Ionic Liquid Electrolytes. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2023.142210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2023]
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Sánchez-Ramírez N, Monje IE, Bélanger D, Camargo PH, Torresi RM. High rate and long-term cycling of silicon anodes with phosphonium-based ionic liquids as electrolytes for lithium-ion batteries. Electrochim Acta 2023. [DOI: 10.1016/j.electacta.2022.141680] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Sánchez‐Ramírez N, Monje IE, Martins VL, Bélanger D, Camargo PHC, Torresi RM. Four Phosphonium‐based Ionic Liquids. Synthesis, Characterization and Electrochemical Performance as Electrolytes for Silicon Anodes. ChemistrySelect 2022. [DOI: 10.1002/slct.202104430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Monje IE, Sanchez-Ramirez N, Santagneli SH, Camargo PH, Bélanger D, Schougaard SB, Torresi RM. In situ-formed nitrogen-doped carbon/silicon-based materials as negative electrodes for lithium-ion batteries. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Souza BL, Chauque S, de Oliveira PF, Emmerling FF, Torresi RM. Mechanochemical optimization of ZIF-8/Carbon/S8 composites for lithium-sulfur batteries positive electrodes. J Electroanal Chem (Lausanne) 2021. [DOI: 10.1016/j.jelechem.2021.115459] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Chauque S, da Silva AG, Batista APDL, de Oliveira-Filho AG, Braga AH, Torresi RM. Cerium oxide-sulfur nanohybrids: Combining the robust adsorption of polysulfides with enhanced redox kinetics to improve the energy Storage capabilities of Li-S batteries. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.138284] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Martins VL, Mantovi PS, Torresi RM. Suppressing early capacitance fade of electrochemical capacitors with water-in-salt electrolytes. Electrochim Acta 2021. [DOI: 10.1016/j.electacta.2021.137854] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Obana TT, Leite MM, Martins VL, Torresi RM. Downplaying the role of water in the rheological changes of conducting polymers by using water-in-salt electrolytes. Phys Chem Chem Phys 2021; 23:12251-12259. [PMID: 34013936 DOI: 10.1039/d1cp01003d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Volumetric changes associated with solvent/electrolyte exchange in electronic conducting polymers (ECPs) play an important role in the mechanical stability of the polymers, as these changes are a critical factor in ECP-based energy storage devices. Thus, the present work explores the hindering of such volumetric deformations for polypyrrole films doped with dodecylbenzenesulphonate (PPy(DBS)) by employing highly concentrated aqueous electrolytes (or water-in-salt electrolytes, WiSEs), and their effects over the corresponding electrochemical capacitor cell energy retention. Electrochemical quartz crystal microbalance with dissipation monitoring measurements for thin PPy(DBS) films in the WiSEs revealed negligible dissipation changes (ΔDn ≈ 0), in contrast with those in dilute aqueous electrolyte (ΔDn ≠ 0), indicating inexpressive structural deformation of PPy(DBS) in the WiSE. This phenomenon is observed for thick freestanding PPy(DBS) films, which presented a maximum bending angle decay from ∼56° (diluted aqueous electrolyte) to 3.5° when working in the WiSE, thus proving the hindering of film bending. The observed trends are reflected in the PPy(DBS) cell energy retention, where the use of a WiSE decreased cell energy fading by 30% after 600 cycles, in comparison with cells based on diluted electrolytes.
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Antoniassi RM, Erikson H, Solla‐Gullón J, Torresi RM, Feliu JM. Small (<5 nm), Clean, and Well‐Structured Cubic Platinum Nanoparticles: Synthesis and Electrochemical Characterization. ChemElectroChem 2020. [DOI: 10.1002/celc.202001336] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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Martins VL, Neves HR, Monje IE, Leite MM, Oliveira PFMDE, Antoniassi RM, Chauque S, Morais WG, Melo EC, Obana TT, Souza BL, Torresi RM. An Overview on the Development of Electrochemical Capacitors and Batteries - part II. AN ACAD BRAS CIENC 2020; 92:e20200800. [PMID: 32638868 DOI: 10.1590/0001-3765202020200800] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Accepted: 05/25/2020] [Indexed: 11/22/2022] Open
Abstract
In the second part of the review on electrochemical energy storage, the devolvement of batteries is explored. First, fundamental aspects of battery operation will be given, then, different materials and chemistry of rechargeable batteries will be explored, including each component of the cell. In negative electrodes, metallic, intercalation and transformation materials will be addressed. Examples are Li or Na metal batteries, graphite and other carbonaceous materials (such as graphene) for intercalation of metal-ions and transition metal oxides and silicon for transformation. In the positive electrode section, materials for intercalation and transformation will be reviewed. The state-of-the-art on intercalation as lithium cobalt oxide and nickel containing oxides will be approached for intercalation materials, whereas sulfur and metal-air will also be explored for transformation. Alongside, the role of electrolyte will be discussed concerning performance and safety, with examples for the next generation devices. Finally, a general future perspective will address both electrochemical capacitors and batteries.
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Chauque S, Braga AH, Gonçalves RV, Rossi LM, Torresi RM. Enhanced Energy Storage of Fe
3
O
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Nanoparticles Embedded in N‐Doped Graphene. ChemElectroChem 2020. [DOI: 10.1002/celc.202000134] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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de Oliveira PFM, Michalchuk AAL, Marquardt J, Feiler T, Prinz C, Torresi RM, Camargo PHC, Emmerling F. Investigating the role of reducing agents on mechanosynthesis of Au nanoparticles. CrystEngComm 2020. [DOI: 10.1039/d0ce00826e] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The influence of reducing agents on the mechanochemical synthesis of Au nanoparticles differ significantly from analogous solution syntheses. Environmentally benign mechanochemical syntheses of metal nanoparticles therefore require dedicated studies.
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de Oliveira PFM, Michalchuk AAL, Buzanich AG, Bienert R, Torresi RM, Camargo PHC, Emmerling F. Tandem X-ray absorption spectroscopy and scattering for in situ time-resolved monitoring of gold nanoparticle mechanosynthesis. Chem Commun (Camb) 2020; 56:10329-10332. [DOI: 10.1039/d0cc03862h] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A new tandem approach combines XRD and XANES for time-resolved in situ monitoring of the mechanochemical synthesis of gold nanoparticles.
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Saleta ME, Tobia D, Figueroa SJA, López CA, Granada M, Sánchez RD, Malta M, Torresi RM. Aging effect on vanadium oxide hybrid nanotubes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2019; 31:505701. [PMID: 31469102 DOI: 10.1088/1361-648x/ab3ed3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Vanadium oxides present a rich magnetic phase diagram depending on the oxidation state of the V ions. In particular the vanadium oxide nanotubes (VO x NTs) present several promising perspectives for different technological applications for which it is essential to know the oxidation state of V ions, as well as to evaluate the stability with the aging time of the tubes. In this work we present a systematic study of the time evolution of the magnetic properties of VO x NTs. For this complete characterization, we used electron spin resonance (ESR) and dc-susceptibility techniques, which were supplemented with TEM microscopy and XANES. We observed that for aging in normal environmental conditions of pressure, temperature and humidity, the V4+ ions oxidize to V5+ . Although the multiwall tubular structure is maintained, this oxidation process produces a marked change in the magnetic properties. We conclude that the aging of the samples affects the V4+ /V5+ relationship in the VO x NTs, which may contribute to explain the significant dispersion of data reported in the bibliography.
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Antonio JL, Martins VL, Córdoba de Torresi SI, Torresi RM. QCM-D study of electrochemical synthesis of 3D polypyrrole thin films for negative electrodes in supercapacitors. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.134887] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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17
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Critelli RA, Bertotti M, Torresi RM. Probe effects on concentration profiles in the diffusion layer: Computational modeling and near-surface pH measurements using microelectrodes. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.09.157] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Dourado AHB, Silva RA, Torresi RM, Sumodjo PTA, Arenz M, Cordoba de Torresi SI. Kinetics, Assembling, and Conformation Control of L‐Cysteine Adsorption on Pt Investigated by
in situ
FTIR Spectroscopy and QCM‐D. Chemphyschem 2018; 19:2340-2348. [DOI: 10.1002/cphc.201800380] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2018] [Indexed: 01/26/2023]
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Corrêa CM, Córdoba de Torresi SI, Benedetti TM, Torresi RM. Viologen-functionalized poly(ionic liquids): Spectroelectrochemical and QCM-D studies. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2017.11.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Martins VL, Torresi RM, Rennie AJ. Design considerations for ionic liquid based electrochemical double layer capacitors. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2018.03.094] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Martins VL, Rennie AJR, Sanchez-Ramirez N, Torresi RM, Hall PJ. Improved Performance of Ionic Liquid Supercapacitors by using Tetracyanoborate Anions. ChemElectroChem 2018; 5:598-604. [PMID: 29577008 PMCID: PMC5861663 DOI: 10.1002/celc.201701164] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Indexed: 11/06/2022]
Abstract
Supercapacitors are energy storage devices designed to operate at higher power densities than conventional batteries, but their energy density is still too low for many applications. Efforts are made to design new electrolytes with wider electrochemical windows than aqueous or conventional organic electrolytes in order to increase energy density. Ionic liquids (ILs) with wide electrochemical stability windows are excellent candidates to be employed as supercapacitor electrolytes. ILs containing tetracyanoborate anions [B(CN)4] offer wider electrochemical stability than conventional electrolytes and maintain a high ionic conductivity (6.9 mS cm−1). Herein, we report the use of ILs containing the [B(CN)4] anion for such an application. They presented a high maximum operating voltage of 3.7 V, and two‐electrode devices demonstrate high specific capacitances even when operating at relatively high rates (ca. 20 F g−1 @ 15 A g−1). This supercapacitor stored more energy and operated at a higher power at all rates studied when compared with cells using a commonly studied ILs.
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Critelli RA, Sumodjo PT, Bertotti M, Torresi RM. Influence of glycine on Co electrodeposition: IR spectroscopy and near-surface pH investigations. Electrochim Acta 2018. [DOI: 10.1016/j.electacta.2017.12.032] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Martins VL, Rennie AJR, Torresi RM, Hall PJ. Ionic liquids containing tricyanomethanide anions: physicochemical characterisation and performance as electrochemical double-layer capacitor electrolytes. Phys Chem Chem Phys 2017. [PMID: 28627530 DOI: 10.1039/c7cp03377j] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorine free ionic liquids with low density and high ionic conductivity for high energy electrochemical double-layer capacitors.
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Torresi RM. Electrochemistry with a Latin-American flavor. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.02.033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Martins VL, Sanchez-Ramirez N, Ribeiro MCC, Torresi RM. Two phosphonium ionic liquids with high Li+ transport number. Phys Chem Chem Phys 2015; 17:23041-51. [DOI: 10.1039/c5cp02799c] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This work presents the physicochemical characterization of two ionic liquids (ILs) with small phosphonium cations, triethylpenthylphosphonium bis(trifluoromethanesulfonyl)imide ([P2225][Tf2N]) and (2-methoxyethyl)trimethylphosphonium bis(trifluoromethanesulfonyl)imide ([P222(201)][Tf2N]), and their mixtures with Li+.
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Sanchez-Ramirez N, Martins VL, Ando RA, Camilo FF, Urahata SM, Ribeiro MCC, Torresi RM. Physicochemical Properties of Three Ionic Liquids Containing a Tetracyanoborate Anion and Their Lithium Salt Mixtures. J Phys Chem B 2014; 118:8772-81. [DOI: 10.1021/jp505051v] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Siqueira LJA, Constantino VRL, Camilo FF, Torresi RM, Temperini MLA, Ribeiro MCC, Izumi CMS. Probing the local environment of hybrid materials designed from ionic liquids and synthetic clay by Raman spectroscopy. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 122:469-475. [PMID: 24326263 DOI: 10.1016/j.saa.2013.11.084] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 11/12/2013] [Accepted: 11/13/2013] [Indexed: 06/03/2023]
Abstract
Hybrid organic-inorganic material containing Laponite clay and ionic liquids forming cations have been prepared and characterized by FT-Raman spectroscopy, X-ray diffraction, and thermal analysis. The effect of varying the length of the alkyl side chain and conformations of cations has been investigated by using different ionic liquids based on piperidinium and imidazolium cations. The structure of the N,N-butyl-methyl-piperidinium cation and the assignment of its vibrational spectrum have been further elucidated by quantum chemistry calculations. The X-ray data indicate that the organic cations are intercalated parallel to the layers of the clay. Comparison of Raman spectra of pure ionic liquids with different anions and the resulting solid hybrid materials in which the organic cations have been intercalated into the clay characterizes the local environment experienced by the cations in the hybrid materials. The Raman spectra of hybrid materials suggest that the local environment of all confined cations, in spite of this diversity in properties, resembles the liquid state of ionic liquids with a relatively disordered structure.
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Torresi RM, Santos MCD. XIX Brazilian Symposium on Electrochemistry and Electroanalytical Chemistry (XIX-SIBEE). J BRAZIL CHEM SOC 2014. [DOI: 10.5935/0103-5053.20140049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Sandoval AP, Feliu JM, Torresi RM, Suárez-Herrera MF. Electrochemical properties of poly(3,4-ethylenedioxythiophene) grown on Pt(111) in imidazolium ionic liquids. RSC Adv 2014. [DOI: 10.1039/c3ra46028b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Benedetti TM, Torresi RM. Rheological changes and kinetics of water uptake by poly(ionic liquid)-based thin films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2013; 29:15589-15595. [PMID: 24289223 DOI: 10.1021/la4038809] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Water uptake by thin films composed of the poly(ionic liquid) poly[diallyldimethylammonium bis(trifluoromethanesulfonyl)imide] (PDDATf2N) and the ionic liquid N,N-butylmethylpyrrolidinium bis(trifluoromethanesulfonyl)imide (Pyr1.4Tf2N) was studied with a quartz crystal microbalance with dissipation. The data obtained for films with different compositions during the passage of dry and wet N2 flow through the films were simulated with the Kevin-Voigt viscoelastic model for assessment of the mass of uptake water as well as the viscoelastic parameters. Our results show that the ionic liquid acts as a plasticizer, reducing the rigidity of the film and decreasing the capacity of water uptake. Introduction to a Li salt (LiTf2N) increases the water uptake capacity and also affects both elastic and viscous parameters due to aggregation among the ions from the ionic liquid and Li(+). However, due to the preferable interaction of Li(+) ions with water molecules, these aggregates are broken when the film is hydrated. In short, the presence of water in such films affects their mechanical properties, which can reflect in their performances as solid state electrolytes and ion-conducting membranes for electrochemical applications.
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Rennie AJR, Sanchez-Ramirez N, Torresi RM, Hall PJ. Ether-Bond-Containing Ionic Liquids as Supercapacitor Electrolytes. J Phys Chem Lett 2013; 4:2970-2974. [PMID: 24920995 PMCID: PMC4047568 DOI: 10.1021/jz4016553] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Accepted: 08/19/2013] [Indexed: 05/12/2023]
Abstract
Electrochemical capacitors (ECs) are electrical energy storage devices that have the potential to be very useful in a wide range of applications, especially where there is a large disparity between peak and average power demands. The use of ionic liquids (ILs) as electrolytes in ECs can increase the energy density of devices; however, the viscosity and conductivity of ILs adversely influence the power density of the device. We present experimental results where several ILs containing different cations have been employed as the electrolyte in cells containing mesoporous carbon electrodes. Specifically, the behavior of ILs containing an ether bond in an alkyl side chain are compared with those of a similar structure and size but containing purely alkyl side chains. Using electrochemical impedance spectroscopy and constant current cycling, we show that the presence of the ether bond can dramatically increase the specific capacitance and reduce device resistance. These results have the important implication that such ILs can be used to tailor the physical properties and electrochemical performance of IL-based electrolytes.
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Martins VL, Nicolau BG, Urahata SM, Ribeiro MCC, Torresi RM. Influence of the Water Content on the Structure and Physicochemical Properties of an Ionic Liquid and Its Li+ Mixture. J Phys Chem B 2013; 117:8782-92. [DOI: 10.1021/jp312839z] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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Torresi RM, Lodovico L, Benedetti TM, Alcântara MR, Debiemme-Chouvy C, Deslouis C. Convective mass transport in ionic liquids studied by electrochemical and electrohydrodynamic impedance spectroscopy. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.01.050] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lodovico L, Torresi RM, Martins VL, Benedetti TM. Electrochemical Behavior of Iron and Magnesium in Ionic Liquids. J BRAZIL CHEM SOC 2013. [DOI: 10.5935/0103-5053.20130305] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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Valenti LE, Martins VL, Herrera E, Torresi RM, Giacomelli CE. Ni(ii)-modified solid substrates as a platform to adsorb His-tag proteins. J Mater Chem B 2013; 1:4921-4931. [DOI: 10.1039/c3tb20769b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Sanchez N, Benedetti TM, Vazquez M, de Torresi SIC, Torresi RM. Kinetic and Thermodynamic Studies on the Adsorption of Reactive Red 239 by Carra Sawdust Treated with Formaldehyde. ADSORPT SCI TECHNOL 2012. [DOI: 10.1260/0263-6174.30.10.881] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Saleta ME, Aurelio G, Bardelli F, Sánchez RD, Malta M, Torresi RM. The local environment of Co2+ ions intercalated in vanadium oxide/hexadecylamine nanotubes. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2012; 24:435302. [PMID: 23041724 DOI: 10.1088/0953-8984/24/43/435302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Vanadium oxide nanotubes constitute promising materials for applications in nanoelectronics as cathode materials, in sensor technology and in catalysis. In this work we present a study on hybrid vanadium oxide/hexadecylamine multiwall nanotubes doped with Co ions using state of the art x-ray diffraction and absorption techniques, to address the issue of the dopant location within the nanotubes' structure. The x-ray absorption near-edge structure analysis shows that the Co ions in the nanotubes are in the 2 + oxidation state, while extended x-ray absorption fine structure spectroscopy reveals the local environment of the Co(2+) ions. Results indicate that Co atoms are exchanged at the interface between the vanadium oxide's layers and the hexadecylamines, reducing the amount of amine chains and therefore the interlayer distance, but preserving the tubular shape. The findings in this work are important for describing Co(2+) interaction with vanadium oxide nanotubes at the molecular level and will help to improve the understanding of their physicochemical behavior, which is desired in view of their promising applications.
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Galhardo KS, Torresi RM, de Torresi SIC. Improving the performance of a glucose biosensor using an ionic liquid for enzyme immobilization. On the chemical interaction between the biomolecule, the ionic liquid and the cross-linking agent. Electrochim Acta 2012. [DOI: 10.1016/j.electacta.2011.10.088] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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da Silva CA, Vidotti M, Fiorito PA, Córdoba de Torresi SI, Torresi RM, Alves WA. Electrochromic properties of a metallo-supramolecular polymer derived from tetra(2-pyridyl-1,4-pyrazine) ligands integrated in thin multilayer films. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2012; 28:3332-3337. [PMID: 22260213 DOI: 10.1021/la204280e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The electrochromic behavior of iron complexes derived from tetra-2-pyridyl-1,4-pyrazine (TPPZ) and a hexacyanoferrate species in polyelectrolytic multilayer adsorbed films is described for the first time. This complex macromolecule was deposited onto indium-tin oxide (ITO) substrates via self-assembly, and the morphology of the modified electrodes was studied using atomic force microscopy (AFM), which indicated that the hybrid film containing the polyelectrolyte multilayer and the iron complex was highly homogeneous and was approximately 50 nm thick. The modified electrodes exhibited excellent electrochromic behavior with both intense and persistent coloration as well as a chromatic contrast of approximately 70%. In addition, this system achieved high electrochromic efficiency (over 70 cm(2) C(-1) at 630 nm) and a response time that could be measured in milliseconds. The electrode was cycled more than 10(3) times, indicating excellent stability.
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Monteiro MJ, Ando RA, Siqueira LJA, Camilo FF, Santos PS, Ribeiro MCC, Torresi RM. Effect of SO2 on the Transport Properties of an Imidazolium Ionic Liquid and Its Lithium Solution. J Phys Chem B 2011; 115:9662-70. [DOI: 10.1021/jp204604r] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Monteiro MJ, Camilo FF, Ribeiro MCC, Torresi RM. Ether-Bond-Containing Ionic Liquids and the Relevance of the Ether Bond Position to Transport Properties. J Phys Chem B 2010; 114:12488-94. [DOI: 10.1021/jp104419k] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Sousa CP, Polo AS, Torresi RM, de Torresi SIC, Alves WA. Chemical modification of a nanocrystalline TiO2 film for efficient electric connection of glucose oxidase. J Colloid Interface Sci 2010; 346:442-7. [DOI: 10.1016/j.jcis.2010.03.036] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Revised: 03/15/2010] [Accepted: 03/17/2010] [Indexed: 11/15/2022]
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Carot ML, Torresi RM, Garcia CD, Esplandiu MJ, Giacomelli CE. Electrostatic and hydrophobic interactions involved in CNT biofunctionalization with short ss-DNA. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2010; 114:4459-4465. [PMID: 20563224 PMCID: PMC2885715 DOI: 10.1021/jp9085359] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
This work is aimed at studying the adsorption mechanism of short chain 20-mer pyrimidinic homo-ss-DNA (oligodeoxyribonucleotide, ODN: polyC(20) and polyT(20)) onto CNT by reflectometry. To analyze the experimental data, the effective-medium theory using the Bruggemann approximation represents a suitable optical model to account for the surface properties (roughness, thickness and optical constants) and the size of the adsorbate. Systematic information about the involved interactions is obtained by changing the physico-chemical properties of the system. Hydrophobic and electrostatic interactions are evaluated by comparing the adsorption on hydrophobic CNT and on hydrophilic silica and by modulating the ionic strength with and without Mg(2+). The ODN adsorption process on CNT is driven by hydrophobic interactions only when the electrostatic repulsion is suppressed. The adsorption mode results in ODN molecules in a side-on orientation with the bases (non-polar region) towards the surface. This unfavorable orientation is partially reverse by adding Mg(2+). On the other hand, the adsorption on silica is dominated by the strong repulsive electrostatic interaction that is screened at high ionic strength or mediated by Mg(2+). The cation-mediated process induces the interaction of the phosphate backbone (polar region) with the surface, leaving the bases free for hybridization. Although the general adsorption behavior of the pyrimidine bases is the same, polyC(20) presents higher affinity for the CNT surface due to its acid-base properties.
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Benedetti TM, Gonçales VR, Petri DFS, Torresi SICD, Torresi RM. Macroporous MnO2 electrodes obtained by template assisted electrodeposition for electrochemical capacitors. J BRAZIL CHEM SOC 2010. [DOI: 10.1590/s0103-50532010000900016] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Gonçales VR, Massafera MP, Benedetti TM, Moore DG, Torresi SICD, Torresi RM. Nanostructured thin films obtained by electrodeposition over a colloidal crystal template: applications in electrochemical devices. J BRAZIL CHEM SOC 2009. [DOI: 10.1590/s0103-50532009000400010] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Oliveira Melo L, Ponzio EA, Carmona-Ribeiro AM, Torresi RM. Poly(aniline)/poly(methylmethacrylate) films obtained from waterborne latex nanoparticles. E-POLYMERS 2008. [DOI: 10.1515/epoly.2008.8.1.1713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractThis paper presents the characterization of poly(aniline) (PANI) and poly(methyl methacrylate) (PMMA) coatings obtained by mixing PANI with PMMA aqueous dispersions (latex particles). These dispersions were characterized by using dynamic light scattering for sizing, zeta-potential analysis and thermal analysis. PMMA and PANI/PMMA dispersions show negative charged particles with zeta potential greater than |40| mV, a zeta-average diameter of 64 nm for pure PMMA and a bi-modal particle-size distribution centered at 45 and 120 nm for a mixture with 25% w/w of PANI. Films obtained by casting were characterized by using scanning electron microscopy and they show a conductivity increase upon PANI content reaching a value of 1 mS cm-1 for a film with 25% w/w of PANI. In addition, Raman spectroscopy have shown the presence of the conducting form of PANI in the films and cyclic voltammetry experiments corroborated that they are electroactive in both acid and neutral solutions.
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Alves WA, Fiorito PA, Froyer G, El Haber F, Vellutini L, Torresi RM, de Torresi SIC. Immobilization of catalysts of biological interest on porous oxidized silicon surfaces. JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY 2008; 8:3570-3576. [PMID: 19051913 DOI: 10.1166/jnn.2008.143] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The present paper deals with the immobilization of redox mediators and proteins onto protected porous silicon surfaces to obtain their direct electrochemical reactions and to retain their bioactivities. This paper shows that MP-11 and viologens are able to establish chemical bonds with 3-aminopropyltriethoxylsilane-modified porous silicon surface. The functionalization of the surfaces have been fully characterized by energy dispersive X-ray analysis (EDX) and X-ray photoelectron spectroscopy (XPS) to examine the immobilization of these mediators onto the solid surface. Amperometric and open circuit potential measurements have shown the direct electron transfer between glucose oxidase and the electrode in the presence of the viologen mediator covalently linked to the 3-aminopropyltriethoxylsilane (APTES)-modified porous silicon surfaces.
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Siqueira LJA, Ando RA, Bazito FFC, Torresi RM, Santos PS, Ribeiro MCC. Shielding of Ionic Interactions by Sulfur Dioxide in an Ionic Liquid. J Phys Chem B 2008; 112:6430-5. [DOI: 10.1021/jp800665y] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Benedetti TM, Bazito FFC, Ponzio EA, Torresi RM. Electrostatic layer-by-layer deposition and electrochemical characterization of thin films composed of MnO2 nanoparticles in a room-temperature ionic liquid. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2008; 24:3602-3610. [PMID: 18290678 DOI: 10.1021/la702347x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Thin films of MnO(2) nanoparticles were grown using the layer-by-layer method with poly(diallyldimetylammonium) as the intercalated layer. The film growth was followed by UV-vis, electrochemical quartz crystal microbalance (EQCM), and atomic force microscopy. Linear growth due to electrostatic immobilization of layers was observed up to 30 bilayers, but electrical connectivity was maintained only for 12 MnO(2)/PPDA bilayers. The electrochemical characterization of this film in 1-butyl-2,3-dimethyl-imidazolium (BMMI) bis(trifluoromethanesulfonyl)imide (TFSI) (BMMITFSI) with and without addition of a lithium salt indicated a higher electrochemical response of the nanostructured electrode in the lithium-containing electrolyte. On the basis of EQCM experiments, it was possible to confirm that the charge compensation process is achieved mainly by the TFSI anion at short times (<2 s) and by BMMI and lithium cations at longer times. The fact that large ions like TFSI and BMMI participate in the electroneutrality is attributed to the redox reaction that occurs at the superficial sites and to the high concentration of these species compared to that of lithium cations.
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Monteiro MJ, Bazito FFC, Siqueira LJA, Ribeiro MCC, Torresi RM. Transport Coefficients, Raman Spectroscopy, and Computer Simulation of Lithium Salt Solutions in an Ionic Liquid. J Phys Chem B 2008; 112:2102-9. [DOI: 10.1021/jp077026y] [Citation(s) in RCA: 191] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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