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David Jager, Daniel Kupka, Miroslava Vaclavikova, Lucia Ivanicova, George Gallios
Degradation of commercial grade Reactive Black 5 (RB5) azo dye by chemical and electrochemical treatment was examined using a dimensionally stable anode and stainless steel cathodes as electrode materials, with NaCl as supporting electrolyte. The electrochemical treatment was compared to the chemical treatment with hypochlorite generated by electrolysis. The compounds present in the commercial grade RB5 azo dye and the products of its electrochemical degradation were separated using ion-pairing high performance liquid chromatography on reversed phase...
September 27, 2017: Chemosphere
Michael S Eberhart, Degao Wang, Renato N Sampaio, Seth L Marquard, Bing Shan, M Kyle Brennaman, Gerald J Meyer, Christopher Dares, Thomas J Meyer
Organic chromophores can be synthesized by established methods and offer an opportunity to expand overall solar spectrum utilization for dye sensitized photoelectrosynthesis cells (DSPECs). However, there are complications in the use of organic chromophores arising from the instability of their oxidized forms, the inability of their oxidized forms to activate a water oxidation catalyst, or the absence of a sufficiently reducing excited state for electron injection into appropriate semiconductors. Three new triarylamine donor-acceptor organic dyes have been investigated here for visible light driven water oxidation...
October 12, 2017: Journal of the American Chemical Society
Hiroshi Ueno, Hiroshi Okada, Shinobu Aoyagi, Yutaka Matsuo
The reaction of [Li+@C60]TFSI- (TFSI = bis(trifluoromethanesulfonyl)imide) with 9-diazofluorene directly produced a [6,6]-adduct of lithium-ion-containing fluoreno[60]fullerene, [6,6]-[Li+@C60(fluoreno)]TFSI-. X-ray structure analysis revealed the spiro-fullerene structure of fluoreno[60]fullerene and unusual localization of the encapsulated Li+ at three different positions. Cyclic voltammetry of the compound showed a reversible one-electron reduction wave at -0.51 V (vs Fc/Fc+) and an irreversible reduction wave for the second electron...
October 12, 2017: Journal of Organic Chemistry
Chip J Smith, Durgesh Vinod Wagle, Hugh M O'Neill, Barbara R Evans, Sheila N Baker, Gary A Baker
To fully leverage the advantages of ionic liquids for many applications, it is necessary to immobilize or encapsulate the fluids within an inert, robust, quasi-solid-state format that does not disrupt their many desirable, inherent features. The formation of ionogels represents a promising approach, however, many earlier approaches suffer from solvent/matrix incompatibility, optical opacity, embrittlement, matrix-limited thermal stability, and/or inadequate ionic liquid loading. We offer a solution to these limitations by demonstrating a straightforward and effective strategy toward flexible and durable ionogels comprising bacterial cellulose supports hosting as much as 99% ionic liquid by total weight...
October 10, 2017: ACS Applied Materials & Interfaces
David Novak, Milos Mojovic, Aleksandra Pavicevic, Martina Zatloukalova, Lenka Hernychova, Martin Bartosik, Jan Vacek
Cytochrome c (cyt c) is one of the most studied conjugated proteins due to its electron-transfer properties and ability to regulate the processes involved in homeostasis or apoptosis. Here we report an electrochemical strategy for investigating the electroactivity of cyt c and its analogs with a disrupted heme moiety, i.e. apocytochrome c (acyt c) and porphyrin cytochrome c (pcyt c). The electrochemical data are supplemented with low-temperature and spin-probe electron paramagnetic resonance (EPR) spectroscopy...
September 21, 2017: Bioelectrochemistry
Jiang Deng, Michael R Nellist, Michaela Burke Stevens, Christian Dette, Yong Wang, Shannon W Boettcher
Nickel (oxy)hydroxide-based (NiOxHy) materials are widely used for energy storage and conversion devices. Understanding dynamic processes at the solid-liquid interface of nickel (oxy)hydroxide is important to improve reaction kinetics and efficiencies. In this study, in situ electrochemical atomic force microscopy (EC-AFM) was used to directly investigate dynamic changes of single-layered Ni(OH)2 nanosheets during electrochemistry measurements. Reconstruction of Ni(OH)2 nanosheets, along with insertion of ions from the electrolyte, results in an increase of the volume by 56% and redox capacity by 300%...
October 11, 2017: Nano Letters
Ming Yan, Yu Kawamata, Phil S Baran
Electrochemistry represents one of the most intimate ways of interacting with molecules. This review discusses advances in synthetic organic electrochemistry since 2000. Enabling methods and synthetic applications are analyzed alongside innate advantages as well as future challenges of electroorganic chemistry.
October 9, 2017: Chemical Reviews
Andrea M Potocny, Allen J Pistner, Glenn P A Yap, Joel Rosenthal
The synthesis, electrochemistry, and photophysical characterization of a 10,10-dimethyl-5,15-bis(pentafluorophenyl)biladiene (DMBil1) linear tetrapyrrole supporting Pd(II) or Pt(II) centers is presented. Both of these nonmacrocyclic tetrapyrrole platforms are robust and easily prepared via modular routes. X-ray diffraction experiments reveal that the Pd[DMBil1] and Pt[DMBil1] complexes adopt similar structures and incorporate a single Pd(II) and Pt(II) center, respectively. Additionally, electrochemical experiments revealed that both Pd[DMBil1] and Pt[DMBil1] can undergo two discrete oxidation and reduction processes...
October 9, 2017: Inorganic Chemistry
Pavel A Takmakov
No abstract text is available yet for this article.
2017: Electrochemical Society Interface
Dan Jiang, Linlin Sun, Tao Liu, Wei Wang
Electrochemical behaviors of Prussian blue (PB) have been intensively studied for decades because it not only serves as a model electro-active nanomaterial in fundamental electrochemistry, but also a promising metal-ion storage electrode material for developing rechargeable batteries. Traditional electrochemical studies are mostly based on bulk materials, leading to an averaged property of billions of PB nanoparticles. In the present work, we employed surface plasmon resonance microscopy (SPRM) to resolve the optical cyclic voltammograms of single PB nanoparticles during electrochemical cycling...
October 6, 2017: Analytical Chemistry
Tom Steentjes, Pascal Jonkheijm, Jurriaan Huskens
Electrochemistry is a powerful tool to study self-assembled monolayers. Here, we modified cystamine-functionalized electrodes with different lengths of linear poly(ethylene glycol) (PEG) polymers end-functionalized with a redox-active ferrocene (Fc) group. The electron transport properties of the Fc probes were studied using cyclic voltammetry. The Fc moiety attached to the shortest PEG (Mn=250 Da) behaved as a surface-confined species, and the homogeneous electron transfer rate constants were determined. The electron transfer of the ferrocene group on the longer PEGs (Mn=3...
October 4, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Il-Hoon Cho, Seockmo Ku
The development of novel and high-tech solutions for rapid, accurate, and non-laborious microbial detection methods is imperative to improve the global food supply. Such solutions have begun to address the need for microbial detection that is faster and more sensitive than existing methodologies (e.g., classic culture enrichment methods). Multiple reviews report the technical functions and structures of conventional microbial detection tools. These tools, used to detect pathogens in food and food homogenates, were designed via qualitative analysis methods...
September 30, 2017: International Journal of Molecular Sciences
Noha Sabi, Angelina Sarapulova, Sylvio Indris, Helmut Ehrenberg, Jones Alami, Ismael Saadoune
The worry about lithium supply has supported the development of research on sodium batteries. Sodium ion batteries are regarded to be the next generation energy storage devices thanks to the generous resources of Na. In spite of that, structural changes in the electrode materials remain the main challenge of this storage technology. NaCoO2 was widely investigated as the competitive candidate for LiCoO2. It has been found that the electrochemical cycling curves of this material present numerous potential steps as a result of electronic transitions and/or structural ordering...
October 3, 2017: ACS Applied Materials & Interfaces
Ken Verguts, Koen Schouteden, Cheng-Han Wu, Lisanne Peters, Nandi Vrancken, Xiangyu Wu, Zhe Li, Maksiem Erkens, Clement Porret, Cedric Huyghebaert, Chris Van Haesendonck, Stefan De Gendt, Steven Brems
The key steps of a transfer of two-dimensional (2D) materials are the delamination of the as-grown material from a growth substrate and the lamination of the 2D material on a target substrate. In state-of-the-art transfer experiments, these steps remain very challenging, and transfer variations often result in unreliable 2D material properties. Here, it is demonstrated that interfacial water can insert between graphene and its growth substrate despite the hydrophobic behavior of graphene. It is understood that interfacial water is essential for an electrochemistry-based graphene delamination from a Pt surface...
October 11, 2017: ACS Applied Materials & Interfaces
Weizhi Wang, Hua Chen, Hao Yun Zhu, Yu Li Huang, Jun Wei Yang
In recent years, low-bandgap polymers have attracted a wide range of attention in many fields. These compounds syntheses were focused on three factors according to the Roncali bandgap theory: 1) the degree of bond length alternation Eδr, 2) the aromatic resonance energy of the cycle ERes, and 3) the substituted groups ESub. Now, we designed and prepared the low-bandgap polymers in a different way by the factor Eθ, the polymer chain deviation from planarity, and EInt, the interaction of the molecular chains in the solid state...
September 30, 2017: Chemistry, An Asian Journal
Lukas Medenbach, Philipp Adelhelm
There is great interest in using sulfur as active component in rechargeable batteries thanks to its low cost and high specific charge (1672 mAh/g). The electrochemistry of sulfur, however, is complex and cell concepts are required, which differ from conventional designs. This review summarizes different strategies for utilizing sulfur in rechargeable batteries among membrane concepts, polysulfide concepts, all-solid-state concepts as well as high-temperature systems. Among the more popular lithium-sulfur and sodium-sulfur batteries, we also comment on recent results on potassium-sulfur and magnesium-sulfur batteries...
September 29, 2017: Topics in Current Chemistry (Journal)
Geoffrey Lawrence, Palraj Kalimuthu, Mercy Benzigar, Kinnari J Shelat, Kripal S Lakhi, Dae-Hwan Park, Qingmin Ji, Katsuhiko Ariga, Paul V Bernhardt, Ajayan Vinu
Creating well-ordered nanoporosity in biomolecules promises stability and activity, offering access to an even wider range of application possibilities. Here, the preparation of nanoporous protein films containing cytochrome c protein molecules is reported through a soft-templating strategy using polystyrene (PS) spheres of different sizes as templates. The stability of the cytochrome c film is demonstrated through electrochemistry studies to show a reusable nature of these films over a long period of time...
September 29, 2017: Advanced Materials
Sanju Gupta, Tyler Smith, Alexander Banaszak, John Boeckl
Graphene quantum dots (GQDs), derived from functionalized graphene precursors are graphene sheets a few nanometers in the lateral dimension having a several-layer thickness. They are zero-dimensional materials with quantum confinement and edge site effects. Intense research interest in GQDs is attributed to their unique physicochemical phenomena arising from the sp²-bonded carbon nanocore surrounded with edged plane functional moieties. In this work, GQDs are synthesized by both solvothermal and hydrothermal techniques, with the optimal size of 5 nm determined using high-resolution transmission electron microscopy, with additional UV-Vis absorption and fluorescence spectroscopy, revealing electronic band signatures in the blue-violet region...
September 29, 2017: Nanomaterials
Feng Lin, Yijin Liu, Xiqian Yu, Lei Cheng, Andrej Singer, Oleg G Shpyrko, Huolin L Xin, Nobumichi Tamura, Chixia Tian, Tsu-Chien Weng, Xiao-Qing Yang, Ying Shirley Meng, Dennis Nordlund, Wanli Yang, Marca M Doeff
Rechargeable battery technologies have ignited major breakthroughs in contemporary society, including but not limited to revolutions in transportation, electronics, and grid energy storage. The remarkable development of rechargeable batteries is largely attributed to in-depth efforts to improve battery electrode and electrolyte materials. There are, however, still intimidating challenges of lower cost, longer cycle and calendar life, higher energy density, and better safety for large scale energy storage and vehicular applications...
September 29, 2017: Chemical Reviews
Ron Naaman, Anup Kumar, Eyal Capua, Kiran Vankayala, Claudio Fontanesi
Electron spin states play an important role in many chemical processes. Most of the spin state studies require the application of a magnetic field. Recently it was found that the transport of electrons through chiral molecules also depends on their spin states and that it may also play a role in enantio-recognition. Electrochemistry has been an important tool both in studying spin-specific processes as well as for enantio-separation of chiral molecules. Here we present a new device that serves as the working electrode in electrochemical cells and is capable of providing information on the correlation of spin selectivity and the electrochemical process...
September 27, 2017: Angewandte Chemie
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