scholarly journals Room-Temperature Self-Standing Cellulose-Based Hydrogel Electrolytes for Electrochemical Devices

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2686
Author(s):  
Iñaki Gomez ◽  
Yolanda Alesanco ◽  
Jose Alberto Blázquez ◽  
Ana Viñuales ◽  
Luis C. Colmenares
Keyword(s):  
Ionic Conductivity ◽  
Hydroxyethyl Cellulose ◽  
Electrochromic Device ◽  
Small Amplitude Oscillatory Shear ◽  
Primary Battery ◽  
Synthesis And Processing ◽  
Electrochemical Devices ◽  
Sustainable Materials ◽  
Gel Composition ◽  
Significant Attention

The trend of research towards more sustainable materials is pushing the application of biopolymers in a variety of unexplored fields. In this regard, hydrogels are attracting significant attention as electrolytes for flexible electrochemical devices thanks to their combination of ionic conductivity and mechanical properties. In this context, we present the use of cellulose-based hydrogels as aqueous electrolytes for electrochemical devices. These materials were obtained by crosslinking of hydroxyethyl cellulose (HEC) with divinyl sulfone (DVS) in the presence of carboxymethyl cellulose (CMC), creating a semi-IPN structure. The reaction was confirmed by NMR and FTIR. The small-amplitude oscillatory shear (SAOS) technique revealed that the rheological properties could be conveniently varied by simply changing the gel composition. Additionally, the hydrogels presented high ionic conductivity in the range of mS cm−1. The ease of synthesis and processing of the hydrogels allowed the assembly of an all-in-one electrochromic device (ECD) with high transmittance variation, improved switching time and good color efficiency. On the other hand, the swelling ability of the hydrogels permits the tuning of the electrolyte to improve the performance of a printed Zinc/MnO2 primary battery. The results prove the potential of cellulose-based hydrogels as electrolytes for more sustainable electrochemical devices.

scholarly journals Dual-Cation Electrolytes Crosslinked with MXene for High-Performance Electrochromic Devices

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 874
Author(s):  
Soyoung Bae ◽  
Youngno Kim ◽  
Jeong Min Kim ◽  
Jung Hyun Kim
Keyword(s):  
Ionic Conductivity ◽  
Response Time ◽  
Indium Tin Oxide ◽  
High Performance ◽  
Fast Response ◽  
High Ionic Conductivity ◽  
Electrochromic Device ◽  
Fast Response Time ◽  
Coloration Efficiency ◽  
Conduction Pathway

MXene, a 2D material, is used as a filler to manufacture polymer electrolytes with high ionic conductivity because of its unique sheet shape, large specific surface area and high aspect ratio. Because MXene has numerous -OH groups on its surface, it can cause dehydration and condensation reactions with poly(4-styrenesulfonic acid) (PSSA) and consequently create pathways for the conduction of cations. The movement of Grotthuss-type hydrogen ions along the cation-conduction pathway is promoted and a high ionic conductivity can be obtained. In addition, when electrolytes composed of a conventional acid or metal salt alone is applied to an electrochromic device (ECD), it does not bring out fast response time, high coloration efficiency and transmittance contrast simultaneously. Therefore, dual-cation electrolytes are designed for high-performance ECDs. Bis(trifluoromethylsulfonyl)amine lithium salt (LiTFSI) was used as a source of lithium ions and PSSA crosslinked with MXene was used as a source of protons. Dual-Cation electrolytes crosslinked with MXene was applied to an indium tin oxide-free, all-solution-processable ECD. The effect of applying the electrolyte to the device was verified in terms of response time, coloration efficiency and transmittance contrast. The ECD with a size of 5 × 5 cm2 showed a high transmittance contrast of 66.7%, fast response time (8 s/15 s) and high coloration efficiency of 340.6 cm2/C.

scholarly journals Bio-Based Polymer Electrolytes for Electrochemical Devices: Insight into the Ionic Conductivity Performance

Materials ◽  
2020 ◽  
Vol 13 (4) ◽  
pp. 838 ◽  
Author(s):  
Marwah Rayung ◽  
Min Min Aung ◽  
Shah Christirani Azhar ◽  
Luqman Chuah Abdullah ◽  
Mohd Sukor Su’ait ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Polymer Electrolytes ◽  
Future Prospects ◽  
Electrolyte System ◽  
The Past ◽  
Device Applications ◽  
Electrochemical Devices ◽  
Insight Into ◽  
General Method

With the continuing efforts to explore alternatives to petrochemical-based polymers and the escalating demand to minimize environmental impact, bio-based polymers have gained a massive amount of attention over the last few decades. The potential uses of these bio-based polymers are varied, from household goods to high end and advanced applications. To some extent, they can solve the depletion and sustainability issues of conventional polymers. As such, this article reviews the trends and developments of bio-based polymers for the preparation of polymer electrolytes that are intended for use in electrochemical device applications. A range of bio-based polymers are presented by focusing on the source, the general method of preparation, and the properties of the polymer electrolyte system, specifically with reference to the ionic conductivity. Some major applications of bio-based polymer electrolytes are discussed. This review examines the past studies and future prospects of these materials in the polymer electrolyte field.

scholarly journals Caracterización Eléctrica de Membranas Poliméricas PVDF/ CF3COOLi

Respuestas ◽  
2015 ◽  
Vol 20 (1) ◽  
pp. 125 ◽  
Author(s):  
Rodrigo Andrés Vásquez-Bonilla ◽  
Nori Magali Jurado-Meneses ◽  
Miguel Iban Delgado-Rosero
Keyword(s):  
Ionic Conductivity ◽  
Impedance Spectroscopy ◽  
Polyvinylidene Fluoride ◽  
Room Temperature ◽  
Solution Method ◽  
Activation Energies ◽  
Pvdf Membrane ◽  
Conductive Membranes ◽  
Electrochemical Devices

Objetivo: Este documento estudia los efectos del trifluoroacetato de litio (CF3 COOLi) al usarse en una matriz de Polifluoruro de vinilideno (PVDF) para mejorar la conductividad iónica para usarse como electrolito para dispositivos electroquímicos. Metodología: Para esto se prepararon membranas en diferentes combinaciones por el método de solución. Las muestras se caracterizaron por espectroscopía de impedancias entre temperaturas de 298 K y 373 K con el fin de identificar el comportamiento de la conductividad de acuerdo a la concentración. Resultados: Los gráficos de conductividad dc en función del inverso de la temperatura, muestran un comportamiento Vogel-Tammann-Fulcher (VTF) con pseudo-energías de activación entre 7.30 × 10-3 y 5.05 × 10-4 eV. Conclusiones: La máxima conductividad obtenida fue de 3.85 ×10-4 S cm-1 a temperatura ambiente para altas concentraciones de CF3 COOLi, siendo este valor comparable con resultados obtenidos en otros estudios.AbstractObjective: This paper studies the effects of lithium trifluoroacetate (CF3 COOLi) when used in a Polyvinylidene fluoride (PVDF) membrane to improve its ionic conductivity for use as electrolyte for electrochemical devices. Method: CF3 COOLi/PVDF Ionic conductive membranes have been prepared by solution method. The samples were characterized by impedance spectroscopy (IS) with temperatures ranging from 298 K at 373 K. Results: The plots of conductivity with the inverse of temperature show an Vogel-Tamman-Fulcher (VTF) behavior, with pseudo activation energies between 7.30 × 10-3 y 5.05 × 10-4 eV. Conclusions: The higther conductivity (3.848 × 10-4 S cm-1) was obtain at room temperature to higth concentration of CF3 COOLi, this values is similarity with results from other documents.Palabras clave: Electrolito sólido, Membrana de compuesto CF3 COOLi/PVDF, Polímero iónicos electro-activos. 

scholarly journals Facile Tailoring of Structures for Controlled Release of Paracetamol from Sustainable Lignin Derived Platforms

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1593
Author(s):  
Mario Culebras ◽  
Mahboubeh Pishnamazi ◽  
Gavin M. Walker ◽  
Maurice N. Collins
Keyword(s):  
Paper Industry ◽  
Chemical Properties ◽  
Crosslinking Density ◽  
Diglycidyl Ether ◽  
Hydrogel Network ◽  
Swelling Capacity ◽  
Sustainable Materials ◽  
Poly Ethylene ◽  
Significant Attention ◽  
And Chemical Properties

Nowadays, sustainable materials are receiving significant attention due to the fact that they will be crucial for the development of the next generation of products and devices. In the present work, hydrogels have been successfully synthesized using lignin which is non-valorized biopolymer from the paper industry. Hydrogels were prepared via crosslinking with Poly(ethylene) glycol diglycidyl ether (PEGDGE). Different crosslinker ratios were used to determine their influence on the structural and chemical properties of the resulting hydrogels. It has been found that pore size was reduced by increasing crosslinker amount. The greater crosslinking density increased the swelling capacity of the hydrogels due to the presence of more hydrophilic groups in the hydrogel network. Paracetamol release test showed higher drug diffusion for hydrogels produced with a ratio lignin:PEGDGE 1:1. The obtained results demonstrate that the proposed approach is a promising route to utilize lignocellulose waste for producing porous materials for advanced biomedical applications in the pharmacy industry.

scholarly journals Impacts of Organic Sorbates on Ionic Conductivity and Nanostructure of Perfluorinated Sulfonic-Acid Ionomers

2021 ◽  
Author(s):  
Adlai Katzenberg ◽  
Andrea Angulo ◽  
Ahmet Kusoglu ◽  
Miguel Modestino
Keyword(s):  
Ionic Conductivity ◽  
Domain Structure ◽  
Structure Property ◽  
X Ray ◽  
Structure Property Relationships ◽  
X Ray Scattering ◽  
The Matrix ◽  
Fuels And Chemicals ◽  
Electrochemical Devices ◽  
Perfluorinated Sulfonic Acid

<p>This study provides insights into structure-property relationships of Nafion membranes swollen with organic sorbates, revealing correlations between sorbate polarity, ionomer domain structure, and ionic conductivity. Swelling, nanostructure, and ionic conductivity of Nafion in the presence of short-chain alcohols and alkanes was studied by infrared spectroscopy, X-ray scattering, and voltammetry. Nafion equilibrated with alkanes exhibited negligible uptake and nanoswelling, while alcohols induced nanoscopic- to macroscopic- swelling ratios that increased with alcohol polarity. In mixed-sorbate environments including organics and water, alcohols preserved the overall ionomer domain structure but altered the matrix to enable higher sorbate uptake. Alkanes did not demonstrably alter the hydrated nanostructure or conductivity. Identifying the impacts of organic sorbates on structure-property relationships in ionomers such as Nafion is imperative as membrane-based electrochemical devices find applications in emerging areas ranging from organic fuel cells to the synthesis of fuels and chemicals.</p>

Effect of Intermolecular Interaction on Ionic Conductivity of CMC-DTAB Plasticized with Ec Based Solid Biopolymer Electrolyte

2021 ◽  
Vol 1025 ◽  
pp. 26-31
Author(s):  
Nurhasniza Mamajan Khan ◽  
Noor Saadiah Mohd Ali ◽  
Ahmad Salihin Samsudin
Keyword(s):  
Ionic Conductivity ◽  
Intermolecular Interaction ◽  
Room Temperature ◽  
Ethylene Carbonate ◽  
Ammonium Bromide ◽  
Ftir Analysis ◽  
Biopolymer Electrolytes ◽  
Electrochemical Devices ◽  
Biopolymer Electrolyte ◽  
Conduction Properties

The present work highlights on the structural and conduction properties of the solid biopolymer electrolytes (SBPE) based carboxymethyl cellulose (CMC) doped dodecyltrimethyl ammonium bromide (DTAB) and plasticized with ethylene carbonate (EC). The SBPE exhibits high ionic conductivity at room temperature where the highest value reaching 1.0 x 10-3 S cm-1 for sample containing with 10 wt. % of EC and increases the ionic conductivity when temperature was increased. Complexation within the SBPE has been confirmed by the FTIR analysis where the intermolecular interaction has improvised the coordination between CMC-DTAB and EC resulting in better structural and conductivity ability. The findings suggest that the great potential of CMC and make it promising to serve as an electrolyte for electrochemical devices.

scholarly journals Luminescent κ-Carrageenan-Based Electrolytes Containing Neodymium Triflate

Molecules ◽  
2019 ◽  
Vol 24 (6) ◽  
pp. 1020 ◽  
Author(s):  
S. Nunes ◽  
S. Saraiva ◽  
R. Pereira ◽  
M. Silva ◽  
L. Carlos ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Alkaline Earth ◽  
Near Infrared ◽  
Low Cost ◽  
Earth Metal ◽  
Cost Effective ◽  
Red Seaweeds ◽  
Multi Wavelength ◽  
Electrochemical Devices ◽  
Uv Visible

In recent years, the synthesis of polymer electrolyte systems derived from biopolymers for the development of sustainable green electrochemical devices has attracted great attention. Here electrolytes based on the red seaweeds-derived polysaccharide κ-carrageenan (κ-Cg) doped with neodymium triflate (NdTrif3) and glycerol (Gly) were obtained by means of a simple, clean, fast, and low-cost procedure. The aim was to produce near-infrared (NIR)-emitting materials with improved thermal and mechanical properties, and enhanced ionic conductivity. Cg has a particular interest, due to the fact that it is a renewable, cost-effective natural polymer and has the ability of gelling in the presence of certain alkali- and alkaline-earth metal cations, being good candidates as host matrices for accommodating guest cations. The as-synthesised κ-Cg-based membranes are semi-crystalline, reveal essentially a homogeneous texture, and exhibit ionic conductivity values 1–2 orders of magnitude higher than those of the κ-Cg matrix. A maximum ionic conductivity was achieved for 50 wt.% Gly/κ-Cg and 20 wt.% NdTrif3/κ-Cg (1.03 × 10−4, 3.03 × 10−4, and 1.69 × 10−4 S cm−1 at 30, 60, and 97 °C, respectively). The NdTrif-based κ-Cg membranes are multi-wavelength emitters from the ultraviolet (UV)/visible to the NIR regions, due to the κ-Cg intrinsic emission and to Nd3+, 4F3/2→4I11/2-9/2.

scholarly journals Electrospun Anion-Conducting Ionomer Fibers—Effect of Humidity on Final Properties

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1020 ◽  
Author(s):  
Manar Halabi ◽  
Meirav Mann-Lahav ◽  
Vadim Beilin ◽  
Gennady E. Shter ◽  
Oren Elishav ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Relative Humidity ◽  
Water Uptake ◽  
Electrospun Fiber ◽  
Large Diameter ◽  
Fiber Mats ◽  
Electrochemical Devices ◽  
Anion Conductivity

Anion-conducting ionomer-based nanofibers mats are prepared by electrospinning (ES) technique. Depending on the relative humidity (RH) during the ES process (RHES), ionomer nanofibers with different morphologies are obtained. The effect of relative humidity on the ionomer nanofibers morphology, ionic conductivity, and water uptake (WU) is studied. A branching effect in the ES fibers found to occur mostly at RHES < 30% is discussed. The anion conductivity and WU of the ionomer electrospun mats prepared at the lowest RHES are found to be higher than in those prepared at higher RHES. This effect can be ascribed to the large diameter of the ionomer fibers, which have a higher WU. Understanding the effect of RH during the ES process on ionomer-based fibers’ properties is critical for the preparation of electrospun fiber mats for specific applications, such as electrochemical devices.

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