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https://www.readbyqxmd.com/read/28938076/fabrication-of-robust-reference-tips-and-reference-electrodes-for-kelvin-probe-applications-in-changing-atmospheres
#1
Matthias Uebel, Ashokanand Vimalanandan, Abdelaziz Laaboudi, Stefan Evers, Martin Stratmann, Detlef Diesing, Michael Rohwerder
The scanning Kelvin probe (SKP) is a versatile method for the measurement of the Volta potential difference between a sample and the SKP tip (Δψsample, SKP-tip). Based on suitable calibration, this technique is highly suited for the application in corrosion science due to its ability to serve as a very sensitive non-contact and non-destructive method for determining the electrode potential, even at buried interfaces beneath coatings or on surfaces covered by ultra-thin electrolyte layers, which are not accessible by standard reference electrodes...
September 22, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28938066/systematic-optimization-of-battery-materials-key-parameter-optimization-for-the-scalable-synthesis-of-uniform-high-energy-and-high-stability-lini0-6mn0-2co0-2o2-cathode-material-for-lithium-ion-batteries
#2
Dong Ren, Yun Shen, Yao Yang, Luxi Shen, Barnaby D A Levin, Yingchao Yu, David A Muller, Héctor D Abruña
Ni-rich LiNixMnyCo1-x-yO2 (x>0.5) (NMC) materials have attracted a great deal of interest as promising cathode candidates for Li-ion batteries (LIBs) due to their low cost and high energy density. However, several issues, including sensitivity to moisture, difficulty in reproducibly preparing well-controlled morphology particles and, poor cyclability, have hindered their large scale deployment; especially for electric vehicle (EV) applications. In this work, we have developed a uniform, highly stable, high-energy density, Ni-rich LiNi0...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28938019/fabrication-of-3-methoxyphenol-sensor-based-on-fe3o4-decorated-carbon-nanotube-nanocomposites-for-environmental-safety-real-sample-analyses
#3
Mohammed M Rahman, Mohammad Musarraf Hussain, Abdullah M Asiri
Iron oxide ornamented carbon nanotube nanocomposites (Fe3O4.CNT NCs) were prepared by a wet-chemical process in basic means. The optical, morphological, and structural characterizations of Fe3O4.CNT NCs were performed using FTIR, UV/Vis., FESEM, TEM; XEDS, XPS, and XRD respectively. Flat GCE had been fabricated with a thin-layer of NCs using a coating binding agent. It was performed for the chemical sensor development by a dependable I-V technique. Among all interfering analytes, 3-methoxyphenol (3-MP) was selective towards the fabricated sensor...
2017: PloS One
https://www.readbyqxmd.com/read/28937775/operando-phonon-studies-of-the-protonation-mechanism-in-highly-active-hydrogen-evolution-reaction-pentlandite-catalysts
#4
Ioannis Zegkinoglou, Ali Zendegani, Ilya Sinev, Sebastian Kunze, Hemma Mistry, Hyo Sang Jeon, Jiyong Zhao, Michael Y Hu, E Ercan Alp, Stefan Piontek, Mathias Smialkowski, Ulf-Peter Apfel, Fritz Körmann, Jorg Neugebauer, Tilmann Hickel, Beatriz Roldan Cuenya
Synthetic pentlandite (Fe4.5Ni4.5S8) is a promising electrocatalyst for hydrogen evolution, demonstrating high current densities, low overpotential and remarkable stability in bulk form. The depletion of sulfur from the surface of this catalyst during the electrochemical reaction has been proposed to be beneficial for its catalytic performance, but the role of sulfur vacancies and the mechanism determining the reaction kinetics are still unknown. We have performed electrochemical operando studies of the vibrational dynamics of pentlandite under hydrogen evolution reaction conditions using 57Fe nuclear resonant inelastic X-ray scattering...
September 22, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28937753/facile-substitution-of-bridging-so2-2-ligands-in-re12-bioctahedral-cluster-complexes
#5
Yakov M Gayfulin, Anton I Smolentsev, Svetlana G Kozlova, Igor N Novozhilov, Pavel E Plyusnin, Nikolay B Kompankov, Yuri V Mironov
Selective substitution of μ-SO2(2-) groups by either O(2-) or Se(2-) ions occurs upon heating the bioctahedral rhenium cluster complex K6[Re12CS14(μ-SO2)3(CN)6] in air atmosphere or in the presence of a Se source, respectively, manifesting the remarkable lability of SO2(2-) ligands bound to a transition-metal cluster. A series of compounds based on the new mixed-ligand anions, [Re12CS14(μ-O)3(CN)6](6-), [Re12CS14(μ-Se)3(CN)6](6-), and [Re12CS14(μ-O)3(OH)6](6-), were isolated and their solid-state structures were elucidated by single-crystal X-ray diffraction analysis...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28937749/heterooctamolybdate-based-clusters-h3-cp-rh-4pmo8o32-and-h5-na2-cp-ir-4pmo8o34-and-derived-hybrid-nanomaterials-with-efficient-electrocatalytic-hydrogen-evolution-reaction-activity
#6
Vikram Singh, Pengtao Ma, Michael G B Drew, Jingyang Niu, Jingping Wang, Guo-Xin Jin
Polyoxometalates (POMs), emerging as a new class of porous molecular materials, play a promising role in homo- and heterogeneous catalysis. Among them, noble-metal-decorated POMs have a profound impact as catalytic materials. Thus, it is imperative to design and structurally explore new catalysts including noble metals. Herein, two new clusters, H3[(Cp*Rh)4PMo8O32]·14H2O (1) and H5[Na2(Cp*Ir)4PMo8O34]·13H2O (2) (Cp* = pentamethylcyclopentadienyl), based on a heterooctamolybdate anionic core were successfully obtained via a one-pot reaction using [Cp*MCl2]2 [M = Rh (1) and Ir (2)] and Na2MoO4 in acidic conditions...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28937747/photo-and-electrocatalytic-hydrogen-production-using-valence-isomers-of-n2s2-type-nickel-complexes
#7
Satoshi Inoue, Manabu Mitsuhashi, Takeshi Ono, Yin-Nan Yan, Yusuke Kataoka, Makoto Handa, Tatsuya Kawamoto
Three Schiff-base-type nickel(II) complexes (1a-3a) and the corresponding noninnocent-type complexes (1b-3b) were synthesized, and the equilibria between these valence isomers were observed in tetrahydrofuran (THF) at room temperature. The electronic state of the noninnocent-type nickel complex was also confirmed by isolation of the one-electron-reduced species. The catalytic ability for the photogeneration of hydrogen from water was examined about 1a-3a and 1b-3b in the presence of a photosensitizer and a sacrificial electron donor...
September 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28937742/inorganic-nanoparticles-metal-organic-framework-hybrid-membrane-reactors-for-efficient-photocatalytic-conversion-of-co2
#8
James Wainaina Maina, Jurg Schutz, Luke Grundy, Elise Des Ligneris, Zhifeng Yi, Lingxue Kong, Cristina Pozo-Gonzalo, Mihail Ionescu, Ludovic F Dumée
Photocatalytic conversion of carbon dioxide (CO2) to useful products has potential to address the adverse environmental impact of global warming. However, most photocatalysts used to date exhibit limited catalytic performance, due to poor CO2 adsorption capacity, inability to efficiently generate photoexcited electrons, and/or poor transfer of the photo-generated electrons to CO2 molecules adsorbed on the catalyst surface. The integration of inorganic semiconductor nanoparticles across metal organic framework (MOF) materials has potential to yield new hybrid materials, combining high CO2 adsorption capacity of MOF and the ability of the semiconductor nanoparticles to generate photoexcited electrons...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28937738/mussel-inspired-coating-and-adhesion-for-rechargeable-batteries-a-review
#9
You Kyeong Jeong, Sung Hyeon Park, Jang Wook Choi
A significant effort is currently being invested to improve the electrochemical performance of classical lithium-ion batteries (LIBs) or to accelerate the advent of new chemistry-based post-LIBs. Regardless of governing chemistry associated with charge storage, stable electrode-electrolyte interface and wet-adhesion among the electrode particles are universally desired for rechargeable batteries adopting liquid electrolytes. In this regard, recent studies have witnessed the usefulness of mussel-inspired polydopamine or catechol functional group in modifying the key battery components, such as active material, separator, and binder...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28937736/the-detrimental-effects-of-carbon-additives-in-li10gep2s12-based-solid-state-batteries
#10
Wenbo Zhang, Thomas Leichtweiß, Sean P Culver, Raimund Koerver, Dyuman Das, Dominik A Weber, Wolfgang G Zeier, Jürgen Janek
All solid-state batteries (SSBs) have recently attracted much attention due to their potential application in electric vehicles. One key issue that is central to improve the function of SSBs is to gain a better understanding of the interfaces between the material components towards enhancing the electrochemical performance. In this work, the interfacial properties of a carbon containing cathode composite, employing Li10GeP2S12 as the solid electrolyte, are investigated. A large interfacial charge transfer resistance builds up upon the inclusion of carbon in the composite, which is detrimental to the resulting cycle life...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28937206/rod-like-sb2se3-wrapped-with-carbon-the-exploring-of-electrochemical-properties-in-sodium-ion-batteries
#11
Peng Ge, Xiao-Yu Cao, Hongshuai Hou, Sijie Li, Xiaobo Ji
One-dimensional Sb2Se3/C rods are prepared through self-assembly from the inducing of anisotropy, and the corresponding sodium storage behaviors are evaluated, presenting excellent electrochemical performances with superior cycle stability and rate capability. The Sb2Se3 delivers a high initial charge capacity of 657.6 mAh g-1 at current density of 0.2 A g-1 between 2.5 and 0.01 V. After 100 cycles, the reversible capacity of Sb2Se3/C remain 485.2 mAh g-1. Even at high rate current density of 2.0 A g-1, the charge capacity still remains 311...
September 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28937161/cold-sprayed-wo3-and-tio2-electrodes-for-photoelectrochemical-water-and-methanol-oxidation-in-renewable-energy-applications
#12
Christoph Haisch, Jenny Schneider, Manuel Fleisch, Henning Gutzmann, Thomas Klassen, Detlef W Bahnemann
Films prepared by cold spray have potential applications as photoanodes in electrochemical water splitting and waste water purification. In the present study cold sprayed photoelectrodes produced with WO3 (active under visible light illumination) and TiO2 (active under UV illumination) on titanium metal substrates were investigated as photoanodes for the oxidation of water and methanol, respectively. Methanol was chosen as organic model pollutant in acidic electrolytes. Main advantages of the cold sprayed photoelectrodes are the improved metal-semiconductor junctions and the superior mechanical stability...
September 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28936874/copper-nitrogen-doped-graphene-hybrid-as-an-electrochemical-sensing-platform-for-distinguishing-dna-bases
#13
Shu-Wen Sun, Hai-Ling Liu, Yue Zhou, Feng-Bin Wang, Xing-Hua Xia
An electrochemical sensor using ultralight and porous copper-nitrogen doped graphene (CuNRGO) nanocomposite as the electrocatalyst has been constructed to simultaneously determine DNA bases such as guanine (G) and cytosine (C), adenine (A) and thymine (T). The nanocomposite is synthesized by thermally annealing an ice templated structure of graphene oxide (GO) and Cu(phen)2. Due to the unique structure and the presence of Cu(2+)-N active sites, the CuNRGO exhibits outstanding electrocatalytic activity toward the oxidation of free DNA bases...
September 22, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28936526/modeling-the-impedance-spectra-of-mixed-conducting-thin-films-with-exposed-and-embedded-current-collectors
#14
Jiapeng Liu, Francesco Ciucci
In this article, we develop a new finite-element-based model for the simulation of the electrochemical impedance spectroscopy (EIS) response of mixed ionic electronic conducting (MIEC) thin films. We first validated the model against experimental data for Sm-doped CeO2 (SDC) symmetrical films deposited on an yittria-stabilized ZrO2 (YSZ) substrate, a pure ionic conductor. We first studied the configuration where the patterned electrodes are placed on top of the MIEC ("exposed" configuration). Our model is capable of correctly reproducing the EIS response and the total capacitance, together with their dependence on the oxygen partial pressure...
September 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28936507/a-pyrene-modified-cobalt-salophen-complex-immobilized-on-multiwalled-carbon-nanotubes-acting-as-a-precursor-for-efficient-electrocatalytic-water-oxidation
#15
Ting-Ting Li, Jinjie Qian, Qianqian Zhou, Jian-Li Lin, Yue-Qing Zheng
Immobilization of earth-abundant water oxidation catalysts (WOCs) on carbon supports to produce functional electrodes for electrochemical water splitting is a crucial approach for future clean energy production. Herein we report the non-covalent immobilization of a pyrene-bearing cobalt(ii) Schiff base complex (2) on the surface of multiwalled carbon nanotubes (MWCNTs) to form a hybrid anode for electrocatalytic water oxidation. The 2/MWCNT anode displayed excellent catalytic activity and durability in neutral aqueous solution, and a catalytic current density of 1...
September 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28936506/anomalous-electroless-deposition-of-less-noble-metals-on-cu-in-ionic-liquids-and-its-application-towards-battery-electrodes
#16
Abhishek Lahiri, Natalia Borisenko, Mark Olschewski, Giridhar Pulletikurthi, Frank Endres
Electroless deposition can be triggered by the difference in the redox potentials between two metals in an electrolyte. In aqueous electrochemistry, galvanic displacement takes place according to the electrochemical series wherein a more noble metal can displace a less noble metal. Herein we show anomalous behaviour in ionic liquids wherein less noble metals such as Fe and Sb were deposited on Cu at temperatures from 25 to 60 °C. Fe formed spherical structures whereas Cu2Sb/Sb formed nanoplates. A multistep process during the electroless deposition of Sb on Cu took place which was discerned from in situ XPS, and mass spectrometry...
September 22, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28936498/biredox-ionic-liquids-new-opportunities-toward-high-performance-supercapacitors
#17
C Bodin, E Mourad, D Zigah, S Le Vot, S A Freunberger, F Favier, O Fontaine
Nowadays commercial supercapacitors are based on purely capacitive storage at the porous carbons that are used for the electrodes. However, the limits that capacitive storage imposes on energy density calls to investigate new materials to improve the capacitance of the device. This new type of electrodes (e.g., RuO2, MnO2…) involves pseudo-capacitive faradaic redox processes with the solid material. Ion exchange with solid materials is, however, much slower than the adsorption process in capacitive storage and inevitably leads to significant loss of power...
September 22, 2017: Faraday Discussions
https://www.readbyqxmd.com/read/28936277/self-limiting-adsorption-of-wo3-oligomers-on-oxide-substrates-in-solution
#18
Matthias Müllner, Jan Balajka, Michael Schmid, Ulrike Diebold, Stijn F L Mertens
Electrochemical surface science of oxides is an emerging field with expected high impact in developing, for instance, rationally designed catalysts. The aim in such catalysts is to replace noble metals by earth-abundant elements, yet without sacrificing activity. Gaining an atomic-level understanding of such systems hinges on the use of experimental surface characterization techniques such as scanning tunneling microscopy (STM), in which tungsten tips have been the most widely used probes, both in vacuum and under electrochemical conditions...
September 14, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
https://www.readbyqxmd.com/read/28935942/oxygen-evolution-reaction-dynamics-monitored-by-an-individual-nanosheet-based-electronic-circuit
#19
Peiyao Wang, Mengyu Yan, Jiashen Meng, Gengping Jiang, Longbing Qu, Xuelei Pan, Jefferson Zhe Liu, Liqiang Mai
The oxygen evolution reaction involves complex interplay among electrolyte, solid catalyst, and gas-phase and liquid-phase reactants and products. Monitoring catalysis interfaces between catalyst and electrolyte can provide valuable insights into catalytic ability. But it is a challenging task due to the additive solid supports in traditional measurement. Here we design a nanodevice platform and combine on-chip electrochemical impedance spectroscopy measurement, temporary I-V measurement of an individual nanosheet, and molecular dynamic calculations to provide a direct way for nanoscale catalytic diagnosis...
September 21, 2017: Nature Communications
https://www.readbyqxmd.com/read/28934696/synthesis-and-application-of-a-plastic-antibody-in-electrochemical-microfluidic-platform-for-oxytocin-determination
#20
Piyush Sindhu Sharma, Zofia Iskierko, Krzysztof Noworyta, Maciej Cieplak, Pawel Borowicz, Wojciech Lisowski, Francis D'Souza, Wlodzimierz Kutner
By means of molecular imprinting of a conducting polymer, molecular cavities selective for oxytocin nonapeptide, an autism biomarker, were designed. Embedding of the oxytocin template, and then its extracting from the molecularly imprinted polymer (MIP) was confirmed by the XPS analysis. AFM imaging of the MIP film surface indicated changes in mechanical properties of the film after template extraction. The MIP synthetic receptor was deposited by potentiodynamic electropolymerization as a thin film on an Au film electrode in an electrochemical miniaturized microfluidic cell...
September 9, 2017: Biosensors & Bioelectronics
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