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Ye Yuan, Jian-Feng Yan, Da-Qiang Lin, Bing-Wei Mao, Yao-Feng Yuan
A novel series of 1, 2, 3-substituted ferrocene-based wires 1a-2a and 4b-5b have been synthesized using iterative Pd-mediated Sonogashira cross-coupling methodology.The molecular structures of 2a and 3b were determined by single-crystal X-ray analysis.Electrochemical data showed that there was a strong electronic communication among the ferrocenyl moieties in 1b-5b. The UV absorption spectra indicated that replacing 1, 1'-substituted ferrocene unit with 1, 2, 3-substituted ferrocene moiety causes delocalization of electrons in the extended π orbitals...
December 13, 2017: Chemistry: a European Journal
Yan B Vogel, Long Zhang, Nadim Darwish, Vinicius R Gonçales, Anton Le Brun, J Justin Gooding, Angela Molina, Gordon G Wallace, Michelle L Coote, Joaquin Gonzalez, Simone Ciampi
Predicting or manipulating charge-transfer at semiconductor interfaces, from molecular electronics to energy conversion, relies on knowledge generated from a kinetic analysis of the electrode process, as provided by cyclic voltammetry. Scientists and engineers encountering non-ideal shapes and positions in voltammograms are inclined to reject these as flaws. Here we show that non-idealities of redox probes confined at silicon electrodes, namely full width at half maximum <90.6 mV and anti-thermodynamic inverted peak positions, can be reproduced and are not flawed data...
December 12, 2017: Nature Communications
William E Gent, Kipil Lim, Yufeng Liang, Qinghao Li, Taylor Barnes, Sung-Jin Ahn, Kevin H Stone, Mitchell McIntire, Jihyun Hong, Jay Hyok Song, Yiyang Li, Apurva Mehta, Stefano Ermon, Tolek Tyliszczak, David Kilcoyne, David Vine, Jin-Hwan Park, Seok-Kwang Doo, Michael F Toney, Wanli Yang, David Prendergast, William C Chueh
Lithium-rich layered transition metal oxide positive electrodes offer access to anion redox at high potentials, thereby promising high energy densities for lithium-ion batteries. However, anion redox is also associated with several unfavorable electrochemical properties, such as open-circuit voltage hysteresis. Here we reveal that in Li1.17-x Ni0.21Co0.08Mn0.54O2, these properties arise from a strong coupling between anion redox and cation migration. We combine various X-ray spectroscopic, microscopic, and structural probes to show that partially reversible transition metal migration decreases the potential of the bulk oxygen redox couple by > 1 V, leading to a reordering in the anionic and cationic redox potentials during cycling...
December 12, 2017: Nature Communications
Paul F Smith, Alexander B Brady, Seung-Yong Lee, Andrea M Bruck, Eric Dooryhee, Lijun Wu, Yimei Zhu, Kenneth J Takeuchi, Esther S Takeuchi, Amy C Marschilok
α-MnO2 structured materials are generally classified as semi-conductors, thus we present a strategy to increase electro-chemical utilization through design of a conductive material interface. Surface treatment of silver hollandite (AgxMn8O16) with Ag+ (Ag2O) provides significant benefit to the resultant electrochemistry, including a 2-4 fold decreased charge transfer resistance, 2-fold increase in deliverable energy den-sity at high rate, and 2-6 fold increased in effective lithium ion diffusion. The improved function of this designed inter-face relative to conventional electrode fabrication strategies is highlighted...
December 11, 2017: ACS Applied Materials & Interfaces
Haiying Yang, Xiuting Li, Christopher Batchelor-McAuley, Stanislav V Sokolov, Richard G Compton
Nafion sub-micro particles doped with methyl viologen (MV2+) are synthesized using the re-precipitation method and characterized by scanning electron microscopy and UV-Vis spectroscopy. The electrochemical behavior of MV2+ incorporated into Nafion particles was investigated at both the ensemble and single particle levels. The charge transferred to single MV-Nafion particles was observed using the nano-impact method and shown to be quantitative. Finally, the charge transferred via individual MV-Nafion particle was substantially enhanced in the presence of permanganate...
December 11, 2017: Physical Chemistry Chemical Physics: PCCP
Christoph Kurt Tanne, Axel Schippers
Biohydrometallurgy comprises the recovery of metals by biologically catalyzed metal dissolution from solids in an aqueous solution. The application of this kind of bioprocessing is described as "biomining," referring to either bioleaching or biooxidation of sulfide metal ores. Acidophilic iron- and sulfur-oxidizing microorganisms are the key to successful biomining. However, minerals such as primary copper sulfides are recalcitrant to dissolution, which is probably due to their semiconductivity or passivation effects, resulting in low reaction rates...
December 10, 2017: Advances in Biochemical Engineering/biotechnology
Michael E Noss, Anne T Hylden, Patrick J Carroll, Donald H Berry
The electrochemical properties of a series of ruthenium complexes bearing the redox noninnocent bis(imino)pyridine ligand were investigated with cyclic voltammetry. An unexpected electrochemical feature in one of the complexes indicated a possible electrochemical-chemical-electrochemical (ECE) process. Further investigation into the oxidation mechanism included the synthesis and isolation of cationic and dicationic analogues of the complex. Density functional theory calculations suggested that a solvent interaction facilitated the ECE mechanism, so a solvent adduct was also synthesized and isolated...
December 8, 2017: Inorganic Chemistry
Yohei Okada, Kazuhiro Chiba
Explosive growth in the use of open shell reactivity, including neutral radicals and radical ions, in the field of synthetic organic chemistry has been observed in the past decade, particularly since the advent of ruthenium complexes in 2008. These complexes generally induce single-electron transfer (SET) processes via visible-light absorption. Additionally, recent significant advancements in organic electrochemistry involving SET processes to provide open shell reactivity offer a complementary method to traditional polarity-driven reactions described by two-electron transfer processes...
December 8, 2017: Chemical Reviews
Patrick K Giesbrecht, Dion B Nemez, David E Herbert
The electrochemistry of pyridines in acidic solution is dominated by a 'weak acid' reduction on the cyclic voltammetry timescale. Here we show that electrochemical hydrogenation of a benzannulated pyridine, phenanthridine (1), to the biomimetic hydride donor 1,2-dihydrophenanthridine (1-H2) can occur selectively at glassy carbon electrodes over longer timescales of potentiostatic electrolysis.
December 8, 2017: Chemical Communications: Chem Comm
Javier Izquierdo, Peter Knittel, Christine Kranz
Scanning electrochemical microscopy (SECM) has evolved from an electrochemical specialist tool to a broadly used electroanalytical surface technique, which has experienced exciting developments for nanoscale electrochemical studies in recent years. Several companies now offer commercial instruments, and SECM has been used in a broad range of applications. SECM research is frequently interdisciplinary, bridging areas ranging from electrochemistry, nanotechnology, and materials science to biomedical research...
December 6, 2017: Analytical and Bioanalytical Chemistry
Jingzhi Hu, Tong Li, Bingqing Wei
The electrochemical-mechanical coupling property of solid electrolyte membranes is critical to improving the performance of solid-state energy storage devices. A new phenomenon was observed that the electrochemical charge-discharge process induced aligned wrinkles on the edge of PVA-H2SO4 gel polymer electrolytes (GPEs), which is attributed to the deformation of polymer chains under electrochemical stimulation according to multiscale simulations. In the reversed direction, by means of modeling and testing, it was proved that the ionic conductivity of GPE can be tuned by mediating the mechanical properties of GPEs via tailoring the polymer at the nanoscale...
December 6, 2017: Journal of Physical Chemistry Letters
Atefeh Ghazavi, Stuart Cogan
OBJECTIVE: With recent interest in kilohertz frequency electrical stimulation for nerve conduction block, understanding the electrochemistry and role of electrode material is important for assessing the safety of these stimulus protocols. Here we describe an approach to determining electrode polarization in response to continuous kilohertz frequency sinusoidal current waveforms. We have also investigated platinum, iridium oxide, and titanium nitride as coatings for high frequency electrodes...
December 5, 2017: Journal of Neural Engineering
Katherine J Lee, Jillian L Dempsey
No abstract text is available yet for this article.
November 22, 2017: ACS Central Science
Karen Mary Mantovani, Kátia Cristina Molgero Westrup, Renaldo Marcos da Silva Junior, Silvia Jaerger, Fernando Wypych, Shirley Nakagaki
Several functional hybrid materials have been reported as immobilized porphyrin derivatives in various organic and inorganic host materials (polymers, mineral clays, silica, etc.), with potential applications in various fields, such as photochemistry, electrochemistry and heterogeneous catalysis. Layered double hydroxides (LDHs), commonly known as hydrotalcite-like materials, have also been analyzed for use as supports for metallocomplexes. Recently, nanocomposite materials with a core-shell structure produced by combining two kinds of nanometer-size materials have received considerable attention, since the use of these materials is a promising strategy to prevent the aggregation and self-oxidation of molecules, reducing the catalytic activity...
December 4, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Raphaël Trouillon, Martin Gijs
This article describes the preparation and characterization of PEDOT-coated paper electrodes. Their specific behavior was investigated, especially the impact of electrode shape on the electrochemical properties. It was found that different electrode geometries promote different results, largely because of a potential drop in the bulk of the electrode material. More importantly, the suitability of these substrates for bio- and neurochemical analyses was investigated. The paper electrodes were found to offer better resistance to both protein and neurotransmitter foulings, in comparison to a planar electrode...
November 30, 2017: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
Yao Zheng, Yan Jiao, Shizhang Qiao, Anthony Vasileff
The hydrogen evolution reaction (HER) is a fundamental process in electrocatalysis and plays an important role in energy conversion for the development of hydrogen-based energy sources. However, the considerably slow rate of the HER in alkaline conditions has hindered advances in water splitting techniques for high-purity hydrogen production. Differing from well documented acidic HER, the mechanistic aspects of alkaline HER are yet to be settled. Herein, we present a critical appraisal of alkaline HER electrocatalysis, with a special emphasis on the connection between fundamental surface electrochemistry on single crystal models and the derived molecular design principle for real-world electrocatalysts...
December 1, 2017: Angewandte Chemie
Yawei Feng, Lili Ling, Jinhui Nie, Kai Han, Xiangyu Chen, Zhenfeng Bian, Hexing Li, Zhong Lin Wang
Recently, atmospheric pollution caused by particulate matter or volatile organic compounds (VOCs) has become a serious issue to threaten human health. Consequently, it is highly desirable to develop an efficient purifying technique with simple structure and low cost. In this study, by combining a triboelectric nanogenerator (TENG) and a photocatalysis technique, we demonstrated a concept of a self-powered filtering method for removing pollutants from indoor atmosphere. The photocatalyst P25 or Pt/P25 was embedded on the surface of polymer-coated stainless steel wires, and such steel wires were woven into a filtering network...
November 30, 2017: ACS Nano
Eva Otyepková, Petr Lazar, Jan Luxa, Karel Berka, Klára Čépe, Zdeněk Sofer, Martin Pumera, Michal Otyepka
Layered transition metal dichalcogenides (TMDs) are at the forefront of materials research. One of the most important applications of these materials is their electrocatalytic activity towards hydrogen evolution, and these materials are suggested to replace scarce platinum. Whilst there are significant efforts towards this goal, there are various reports of electrocatalysis of MoS2 (which is the most commonly tested TMD) with large variations of the reported electrocatalytic effect of the material, with overpotential varying by several hundreds of millivolts...
November 30, 2017: Nanoscale
Ileana F Márquez, Marisela Vélez
We describe a simple way of fusing E. coli lipid vesicles onto a gold surface. Supported lipid bilayers on metal surfaces are interesting for several reasons: transducing a biological signal to an electric readout, using surface analytical tools such as Surface Plasmon Resonance (SPR), Infrared Reflection Absorption Spectroscopy, Neutron Reflectivity or Electrochemistry. The most widely used method to prepare supported lipid membranes is fusion of preexisting liposomes. It is quite efficient on hydrophilic surfaces such as glass, mica or SiO2, but vesicle fusion on metals and metal oxide surfaces (as gold, titanium oxide or indium tin oxide), remains a challenge, particularly for vesicles containing charged lipids, as is the case of bacterial lipids...
2017: MethodsX
Andrew Abbott, Leigh Aldous, Natalia Borisenko, Samuel Coles, Olivier Fontaine, Jorge Daniel Gamarra Garcia, Ramesh Gardas, Oliver Hammond, Laurence J Hardwick, Paul-Henri Haumesser, Florian Hausen, Corie Horwood, Johan Jacquemin, Robert Jones, Erlendur Jónsson, Abhishek Lahiri, Doug MacFarlane, Guy Marlair, Benjamin May, Himani Medhi, Vitor H Paschoal, Joshua E S J Reid, Theresa Schoetz, Kazuhisa Tamura, Morgan L Thomas, Shraeddha Tiwari, Betul Uralcan, Adriaan van den Bruinhorst, Masayoshi Watanabe, James Wishart
No abstract text is available yet for this article.
November 29, 2017: Faraday Discussions
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