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https://www.readbyqxmd.com/read/30114361/enhanced-wear-performance-of-hybrid-epoxy-ceramic-coatings-on-magnesium-substrates
#1
Junjie Yang, Shichun Di, Carsten Blawert, Sviatlana Lamaka, Linqian Wang, Banglong Fu, Pingli Jiang, Li Wang, Mikhail Larionovich Zheludkevich
Epoxy-based polymer was deposited as sealing agent on porous anodized coatings prepared by plasma electrolytic oxidation (PEO) to construct multilayered "soft-hard" coatings on Mg substrates. Different thicknesses and microstructures of the top epoxy layer were achieved by employing different dip-coating strategies. Atomic force microscopye (AFM), pull-off tests and nanoindentation tests were conducted to study the surface roughness, the adhesion strength of the epoxy layer and the mechanical properties of each component in the hybrid coating system...
August 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30113816/electrochemical-characterization-of-single-lithium-ion-conducting-polymer-electrolytes-based-on-sp-3-boron-and-poly-ethylene-glycol-bridges
#2
Gregorio Guzmán-González, Hugo Joaquin Avila-Paredes, Ernesto Rivera, Ignacio González
A novel series of single lithium ion conducting polymer electrolytes (SLICPE) based on sp3 boron and PEG bridges is presented, in the context of the development of a new generation of batteries, with the aim to overcome the problems related to concentration overpotential and low ion transport numbers in conventional solid polymer electrolytes (SPE). The phase separation generated by the physical mixture of SPE with plasticizers such as poly(ethylene oxide) (PEO) is still a serious problem. In this work, the use of poly(ethylene glycol) (PEG) with different chain lengths, for the polycondensation reaction with LiB(OCH3 )4 , to synthesize SLICPE allows preventing phase separation, while tuning the predominant conduction mechanism, and thus the electrical properties, especially the lithium ion transference number...
August 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30113808/electrochemical-behaviors-of-a-vapor-phase-polymerized-conductive-polymer-coated-on-liv-3-o-8-in-li-metal-rechargeable-batteries
#3
Byung Hyuk Kim, Ki Yoon Bae, Sung Ho Cho, Woo Young Yoon
A new coating method called vapor-phase polymerization (VPP) is used to coat a conductive polymer on LiV3 O8 (LVO) surfaces for the first time in lithium-metal secondary batteries to protect the interface layer and enhance the electrochemical properties of the cathode. The VPP method can be used to coat an appropriate amount of the polymer and homogeneously coat the LVO active material surfaces because of the use of vapor-phase monomers. The presence of the coating layer was confirmed by X-ray photoelectron spectroscopy, Fourier transform infrared spectroscopy, and transmission electron microscopy...
August 16, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30109930/fully-zwitterionic-polymer-supported-ionogel-electrolytes-featuring-a-hydrophobic-ionic-liquid
#4
Morgan E Taylor, Matthew J Panzer
In this report, fully-zwitterionic (ZI) copolymer scaffolds for ionogel electrolytes have been synthesized via in situ photopolymerization using various molar ratios of 2-methacryloyloxyethyl phosphorylcholine (MPC) and sulfobetaine vinylimidazole (SBVI) within the hydrophobic ionic liquid 1-ethyl-3-methyl-imidazolium bis(trifluoromethylsulfonyl)imide (EMI TFSI). Depending on the chemical composition of the ZI scaffold, ionogel room temperature ionic conductivities are found to vary between 2.5 and 6.7 mS/cm at a fixed 20 mol% total polymer content...
August 15, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/30109770/high-performance-flexible-organic-electrochemical-transistors-for-monitoring-cardiac-action-potential
#5
Yuanying Liang, Mathis Ernst, Fabian Brings, Dmitry Kireev, Vanessa Maybeck, Andreas Offenhäusser, Dirk Mayer
Flexible and transparent electronic devices possess crucial advantages over conventional silicon based systems for bioelectronic applications since they are able to adapt to nonplanar surfaces, cause less chronic immunoreactivity, and facilitate easy optical inspection. Here, organic electrochemical transistors (OECTs) are embedded in a flexible matrix of polyimide to record cardiac action potentials. The wafer-scale fabricated devices exhibit transconductances (12 mS V-1 ) and drain-source on-to-off current ratios (≈105 ) comparable to state of the art nonflexible and superior to other reported flexible OECTs...
August 14, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/30108229/studies-on-structure-property-relations-of-efficient-decal-substrates-for-industrial-grade-membrane-electrode-assembly-development-in-pemfc
#6
Sri Harsha Akella, Ebenezer D, Sai Siddhardha R S, Alkesh Ahire, Nawal Kishor Mal
Electrode fabrication and membrane electrode assembly (MEA) processes are critical steps in polymer electrolyte membrane fuel cell (PEMFC) technology. The properties of decal substrate material are important in decal coating technique for efficient transfer of catalyst layer. In the present study, MEAs are fabricated in decal method using 6 different decal substrates among which polypropylene (PP) is found ideal. Morphological, thermal, spectroscopic and sessile drop measurements are conducted for 6 decal substrates to evaluate the thermal and physicochemical properties...
August 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30106583/diffusivity-of-mono-and-divalent-salts-and-water-in-polyelectrolyte-desalination-membranes
#7
Dipak Aryal, Venkat Ganesan
The dynamics of ions and solvent molecules in polyelectrolyte desalination membranes is key to water purification technologies in which selective transport of the different components is desired. Recent experimental and our computational results have shown that nontrivial mechanisms underlie the transport properties of salt ions and water in charged polymer membranes. Explicitly, in polymer electrolytes, we found a reversal in the salt concentration dependence of the mobilities of Na+ , Cl- salt ions and water molecules when compared with aqueous solutions...
August 14, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/30106506/toward-tailorable-zn-ion-textile-batteries-with-high-energy-density-and-ultrafast-capability-building-high-performance-textile-electrode-in-3d-hierarchical-branched-design
#8
Tao Zhao, Guoming Zhang, Fangshuo Zhou, Sen Zhang, Chao Deng
Rechargeable Zn-ion batteries are promising candidates for wearable energy storage devices. However, their performance is severely restricted by the low conductivity and inferior mass loading. Herein, a new type of the textile based electrodes with 3D hierarchical branched design is reported. Both Ni nanoparticles and carbon nanotubes are used to build conductive coatings on the textiles. The 3D hierarchical nanostructures, consisting of the vertical-aligned nanosheets and the fluffy-like small flakes, grow on the conductive textiles to form the self-supported electrodes...
August 14, 2018: Small
https://www.readbyqxmd.com/read/30106308/geoelectrodes-and-fuel-cells-for-simulating-hydrothermal-vent-environments
#9
Laura M Barge, Frederick C Krause, John-Paul Jones, Keith Billings, Pablo Sobron
Gradients generated in hydrothermal systems provide a significant source of free energy for chemosynthetic life and may play a role in present-day habitability on ocean worlds. Electron/proton/ion gradients, particularly in the context of hydrothermal chimney structures, may also be relevant to the origins of life on Earth. Hydrothermal vents are similar in some ways to typical fuel cell devices: redox/pH gradients between seawater and hydrothermal fluid are analogous to the fuel cell oxidant and fuel reservoirs; the porous chimney wall is analogous to a separator or ion-exchange membrane and is also a conductive path for electrons; and the hydrothermal minerals are analogous to electrode catalysts...
August 14, 2018: Astrobiology
https://www.readbyqxmd.com/read/30105848/water-deactivated-polyelectrolyte-hydrogel-electrolytes-for-flexible-high-voltage-supercapacitors
#10
Junjie Wei, Jie Zhou, Shasha Su, Jinhua Jiang, Jing Feng, Qigang Wang
With the boom of flexible electronic products and wearable devices, flexible energy storage devices, e.g., supercapacitors with high performance, are attracting increasing interest. A flexible water-deactivated polyelectrolyte hydrogel electrolyte with good mechanical properties and high ionic conductivity was prepared using an anionic polymer CMC and a cationic monomer MAPTAC. It was then applied in a supercapacitor with flexible activated carbon electrodes. This flexible supercapacitor possesses a high operating voltage of 2...
August 13, 2018: ChemSusChem
https://www.readbyqxmd.com/read/30099868/conducting-polymer-coating-on-high-voltage-cathode-based-on-soft-chemistry-approach-towards-improving-battery-performance
#11
Yonguk Kwon, Yongho Lee, Sang-Ok Kim, Hyung-Seok Kim, Ki Jae Kim, Dongjin Byun, Wonchang Choi
The surface of 5V class LiNi0.5Mn1.5O4 particle is modified with poly(3,4-ethylenedioxythiophene) (PEDOT) conducting polymer by utilizing the hydrophobic characteristics of the 3,4-ethylenedioxythiophene (EDOT) monomer and the tail group of cetyl trimethyl ammonium bromide (CTAB) surfactants, in addition to the electrostatic attraction between cationic CTAB surfactant and cathode materials with a negative zeta potential in aqueous solution. With this novel concept, we design and prepare a uniform EDOT monomer layer on the cathode materials, and chemical polymerization of the EDOT coating layer is then carried out to achieve PEDOT-coated cathode materials via a simple one-pot preparation process...
August 13, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30099303/three-dimensional-vanadium-pentoxide-graphene-foam-composite-as-positive-electrode-for-high-performance-asymmetric-electrochemical-supercapacitor
#12
Ndeye M Ndiaye, Balla D Ngom, Ndeye F Sylla, Tshifhiwa M Masikhwa, Moshawe J Madito, Damilola Momodu, Tshepo Ntsoane, Ncholu Manyala
The electrochemical performance of hydrothermal synthesized three dimensional (3D) orthorhombic vanadium pentoxide (V2 O5 ) nanosheets and vanadium pentoxide/graphene foam (V2 O5 /GF) composites at different mass loading of GF were successfully studied. The optimized V2 O5 /GF-150 mg composite provided a high specific capacity of 73 mA h g-1 , which was much higher than that the pristine V2 O5 (60 mA h g-1 ) nanosheets at a specific current of 1 A g-1 . A hybrid capacitor was also fabricated by adopting a carbon-based negative electrode obtained from the pyrolysis of an iron-PANI polymer (C-Fe/PANI) mixture and the 3D V2 O5 /GF-150 mg composite as the positive electrode in 6 M KOH electrolyte...
August 6, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/30096225/an-alkaline-exchange-polymer-membrane-electrolyte-for-high-performance-of-all-solid-state-electrochemical-devices
#13
Yanan Wei, Min Wang, Nengneng Xu, Luwei Peng, Jianfeng Mao, Qiaojuan Gong, Jinli Qiao
As a potential solution to ubiquitous energy concerns, anion-exchange membranes (AEMs) have been widely used as the electrolyte in alkaline fuel cells (AFCs), and significant refinement of AEMs has been achieved in the past few decades. However, it remains unknown whether AEMs can be used as an electrolyte in a solid-state supercapacitor or zinc air battery. A low-cost alkaline exchange-membrane electrolyte comprised of chitosan (CS) and poly(diallyldimethylammonium chloride) (PDDA) that possesses a high OH- conductivity (0...
August 10, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30091844/a-smart-flexible-solid-state-photovoltaic-device-with-interfacial-cooling-recovery-feature-through-thermoreversible-polymer-gel-electrolyte
#14
Keval K Sonigara, Hiren K Machhi, Jayraj V Vaghasiya, Alain Gibaud, Swee Ching Tan, Saurabh S Soni
Quasi-solid-state dye-sensitized solar cells (DSSCs) fabricated with lightweight flexible substrates have a great potential in wearable electronic devices for in situ powering. However, the poor lifespan of these DSSCs limits their practical application. Strong mechanical stresses involved in practical applications cause breakage of the electrode/electrolyte interface in the DSSCs greatly affecting their performance and lifetime. Here, a mechanically robust, low-cost, long-lasting, and environment-friendly quasi-solid-state DSSC using a smart thermoreversible water-based polymer gel electrolyte with self-healing characteristics at a low temperature (below 0 °C) is demonstrated...
August 9, 2018: Small
https://www.readbyqxmd.com/read/30087229/electrochemical-impedance-spectroscopy-as-a-diagnostic-tool-in-polymer-electrolyte-membrane-electrolysis
#15
Stefania Siracusano, Stefano Trocino, Nicola Briguglio, Vincenzo Baglio, Antonino S Aricò
Membrane⁻electrode assemblies (MEAs) designed for a polymer electrolyte membrane (PEM) water electrolyser based on a short-side chain (SSC) perfluorosulfonic acid (PFSA) membrane, Aquivion® , and an advanced Ir-Ru oxide anode electro-catalyst, with various cathode and anode noble metal loadings, were investigated. Electrochemical impedance spectroscopy (EIS), in combination with performance and durability tests, provided useful information to identify rate-determining steps and to quantify the impact of the different phenomena on the electrolysis efficiency and stability characteristics as a function of the MEA properties...
August 7, 2018: Materials
https://www.readbyqxmd.com/read/30085642/coordination-polymers-derived-three-dimensional-hierarchical-cofe2o4-hollow-spheres-as-high-performance-lithium-ion-storage
#16
Canpei Wang, Hang Su, Yuhang Ma, Dingcheng Yang, Yutao Dong, Dan Li, Lizhen Wang, Yushan Liu, Jianmin Zhang
Hierarchical CoFe2O4 (CFO) hollow spheres were successfully synthesized via solvothermal method and calcination treatment. The obtained CFO completely inherited the hollow structure and spherical morphology of its precursor of cobalt based ferrocenyl coordination polymers (Co-Fc-CPs). The three-dimensional (3D) porous hierarchical hollow structure can not only promote the permeation of electrolyte and shorten the lithium ion transfer distance, but also provide cushion for the volume change during insertion/extraction of lithium ions...
August 7, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30084154/photoelectrochemical-strategy-for-discrimination-of-microbial-pathogens-using-conjugated-polymers
#17
Xin Zhou, Pengbo Zhang, Fengting Lv, Libing Liu, Shu Wang
A photoelectrochemical (PEC) biosensor for facile and sensitive identification of pathogenic microorganisms was developed. Cationic poly(phenylene vinylene) derivative (PPV) as photoelectrochemical active species was modified on the electrode. Under light irradiation, PPV could be excited and generate efficient photocurrent. PPV also had the ability to bind with negatively charged membrane of pathogenic microorganisms, which hindered the electron transfer between electrode and electrolyte. As a result, the photocurrent would decrease obviously...
August 7, 2018: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/30080383/polymer-capacitor-dielectrics-for-high-temperature-applications
#18
Janet Ho, Steven G Greenbaum
Much effort has been invested for nearly five decades to identify and develop new polymer capacitor dielectrics for higher than ambient temperature applications. Simultaneous demands of processability, dielectric permittivity, thermal conductivity, and dielectric breakdown strength dictated by increasing high power performance criteria limit the number of available materials. The present review first explains the advantages of metallized polymer film capacitors over the film-foil, ceramic, and electrolytic counterparts, and then presents a comprehensive review on both past developmental effort of commercial resins and recent research progress on new polymers targeted for operating temperature above 150 °C...
August 6, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/30073772/aliphatic-polycarbonate-based-solid-state-polymer-electrolytes-for-advanced-lithium-batteries-advances-and-perspective
#19
REVIEW
Jianjun Zhang, Jinfeng Yang, Tiantian Dong, Min Zhang, Jingchao Chai, Shanmu Dong, Tianyuan Wu, Xinhong Zhou, Guanglei Cui
Conventional liquid electrolytes based lithium-ion batteries (LIBs) might suffer from serious safety hazards. Solid-state polymer electrolytes (SPEs) are very promising candidate with high security for advanced LIBs. However, the quintessential frailties of pristine polyethylene oxide/lithium salts SPEs are poor ionic conductivity (≈10-8 S cm-1 ) at 25 °C and narrow electrochemical window (<4 V). Many innovative researches are carried out to enhance their lithium-ion conductivity (10-4 S cm-1 at 25 °C), which is still far from meeting the needs of high-performance power LIBs at ambient temperature...
August 2, 2018: Small
https://www.readbyqxmd.com/read/30073724/extra-large-mechanical-anisotropy-of-a-hydrogel-with-maximized-electrostatic-repulsion-between-cofacially-aligned-2d-electrolytes
#20
Koki Sano, Yuka Onuma Arazoe, Yasuhiro Ishida, Yasuo Ebina, Minoru Osada, Takayoshi Sasaki, Takaaki Hikima, Takuzo Aida
In our previous work, we have shown that "electrostatic forces", when generated anisotropically in aqueous media by 2D electrolytes upon cofacial orientation, enable the formation of a hydrogel with an anisotropic parameter, as defined by the ratio of elastic moduli, of 3. Herein, we successfully developed the design strategy for a hydrogel with an anisotropic parameter of no less than 85. This value is not only 28 times greater than that of our previous anisotropic hydrogel but also 6 times larger than the current champion record in synthetic hydrogels (anisotropic parameter = ~15)...
August 2, 2018: Angewandte Chemie
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