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Electrochemical Behaviour

Andreea Ionescu, Nicolas Godbert, Iolinda Aiello, Loredana Ricciardi, Massimo La Deda, Alessandra Crispini, Emilia Sicilia, Mauro Ghedini
Novel anionic cyclometalated Pt(ii) square-planar complexes NBu4[(C^N)PtII(S^S)], containing 2-phenylpyridine H(PhPy), 2-(2,4-difluorophenyl)-pyridine H(F2PhPy) and benzo[h]quinoline H(Bzq), respectively, as a cyclometalated ligand and the dianionic 1,2-benzenedithiolate (Thio)2- fragment as an (S^S) ligand, were synthesised. By the simple addition of an equivalent of (Thio)2- to the NBu4[(C^N)PtII(Thio)] complexes, octahedral anionic NBu4[(C^N)PtIV(Thio)2] analogues were obtained, representing, to the best of our knowledge, the first examples of Pt(iv) anionic cyclometalated complexes...
August 10, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Paul Baek, Jitendra P Mata, Anna Sokolova, Andrew Nelson, Nihan Aydemir, Rayomand Shahlori, Duncan J McGillivray, David Barker, Jadranka Travas-Sejdic
Electronic graft copolymers with conjugated polymer backbones are emerging as promising materials for various organic electronics. These materials combine the advantages of organic electronic materials, such as molecular tunability of opto-electronic and electrochemical properties, with solution processability and other 'designer' physical and mechanical properties imparted through the addition of grafted polymer side chains. Future development of such materials with complex molecular architecture requires a better understanding of the effect of molecular parameters, such as side chain length, on the structure and, in turn, on the electronic properties...
August 7, 2018: Soft Matter
Petar Todorov, Petia Peneva, Daniela Pechlivanova, Stela Georgieva, Elena Dzhambazova
In the present study, some new analogues of VV-hemorphin-5, modified at position 1 and 7 by the non-proteinogenic and/or natural amino acids followed the structures Xxx-Val-Val-Tyr-Pro-Trp-Thr-Gln-NH2 and Val-Val-Tyr-Pro-Trp-Thr-Yyy-NH2 , where Xxx is Ile or Aib and Yyy is Lys/Orn/Dap/Dab were synthesized to investigate their potential antinociceptive activities. We report also the redox potentials and the acid/base properties as pKa values of these peptide analogues which were compared toward electrochemical behaviour of tryptophan containing peptides...
July 30, 2018: Bioorganic & Medicinal Chemistry Letters
Meng Shao, Yuanyuan Cheng, Tao Zhang, Sheng Li, Weina Zhang, Bing Zheng, Jiansheng Wu, Wei-Wei Xiong, Fengwei Huo, Jun Lu
Sodium ion batteries suffer the disadvantages of poor rate performance and cycling stability due to its sluggish sodiation kinetics. A rational design strategy for both materials compositions and structures has been proposed to meet these challenges. Herein, a triple-component composite derived from MOFs, comprising FeS2, nitrogen-sulfur co-doped porous carbon and reduced graphene oxide (FeS2@NSC/G) has been successfully synthesized. With the capacities contributions from different sodium storage routes (diffusion controlled processes and surface capacitive processes) at varies rate conditions, it is aiming to make full use of each component in the electrode composite and their unique porous structures...
August 2, 2018: ACS Applied Materials & Interfaces
Zifei Zhou, Xifeng Liu, Wei Wu, Sungjo Park, A Lee Miller Ii, Andre Terzic, Lichun Lu
Biomimetic biomaterials require good biocompatibility and bioactivity to serve as appropriate scaffolds for tissue engineering applications. Recent developments demonstrated that the unique properties of carbon nanotubes (CNTs) can enhance neural cell growth and axon organization. We previously developed a promising nerve conduit manufactured from biodegradable polycaprolactone fumarate (PCLF) for use in peripheral nerve regeneration applications. In the present study, we fabricated conductive PCLF-CNT scaffolds using ultraviolet (UV) induced photocrosslinking...
July 18, 2018: Biomaterials Science
Jaison Joy, Sivamathini Rajappa, Vijayamohanan K Pillai, Subbiah Alwarappan
In this work, we report a one-pot solvothermal strategy to synthesize Co3 Fe7 incorporated graphene nanoribbons (Co3 Fe7 ). An improved bi-functional electrocatalytic activity over the traditional electrocatalysts is exhibited by the Co3 Fe7 /nitrogen-doped graphene nanoribbon (NGNR) composite. For instance, this composite Co3 Fe7 /NGNRs depicted a lower overpotential of 350 mV than NGNRs (380 mV) and IrO2 (450 mV) to sustain 10 mA cm-2 for an oxygen evolution reaction in 1.0 M KOH. Furthermore, during an oxygen reduction reaction, the catalyst exhibited a four-electron pathway and it is interesting to note that its electrocatalytic behavior is on a par with commercial Pt/C...
July 13, 2018: Nanotechnology
Michail-Antisthenis Tsompanas, Andy Adamatzky, Ioannis Ieropoulos, Neil Phillips, Georgios Ch Sirakoulis, John Greenman
An accurate modelling of bio-electrochemical processes that govern Microbial Fuel Cells (MFCs) and mapping their behaviour according to several parameters will enhance the development of MFC technology and enable their successful implementation in well defined applications. The geometry of the electrodes is among key parameters determining efficiency of MFCs due to the formation of a biofilm of anodophilic bacteria on the anode electrode, which is a decisive factor for the functionality of the device. We simulate the bio-electrochemical processes in an MFC while taking into account the geometry of the electrodes...
April 30, 2018: IEEE/ACM Transactions on Computational Biology and Bioinformatics
Shao-Chuang Liu, Meng-Xiao Li, Meng-Yin Li, Ya-Qian Wang, Yi-Lun Ying, Yong-Jing Wan, Yi-Tao Long
Nanopore analysis is a powerful technique for single molecule analysis by virtue of its electrochemically confined effects. As a single molecule translocates through the nanopore, the featured ionic current pattern on the time scale contains single molecule characteristics including volume, charge, and conformational properties. Although the characteristics of a single molecule in a nanopore have been written to the featured ionic current, extracting the dynamic information from a complex current trace is still a big challenge...
July 9, 2018: Faraday Discussions
Rafael J Müller, Jinggang Lan, Karla Lienau, René Moré, C A Triana, Marcella Iannuzzi, Greta R Patzke
Transition metal carbodiimides MNCN (M = Co, Ni, Co0.9Ni0.1, Mn and Cu), were studied by simultaneous operando Raman and X-ray absorption spectroscopy (XAS) with focus on surface oxide detection during electrocatalytic water oxidation. As a proof of concept, easily modifiable screen-printed electrodes were used in this unified operando synchrotron setup for a trade-off between convenience of electrochemical anodization and spectroscopic data acquisition. Monitoring of chemical and structural transformations at the electrode surface during initial anodic electrode polarization shows stability for MNCN with M = Co, Ni, Co0...
July 6, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
D S P Cardoso, B Šljukić, N Sousa, C A C Sequeira, F M L Figueiredo, D M F Santos
Typical direct liquid fuel cells (DLFCs) use a liquid fuel and O2 as the oxidant. However, for applications where O2 is not available (e.g., space and underwater), the gas has been replaced by H2O2 as a liquid oxidant. This work presents a study of various ceramic disc electrodes with K2NiO4 structure and nominal compositions La2NiO4, La2CuO4, La1.9Pr0.1CuO4, La1.9Sr0.1CuO4, La1.8Ce0.2NiO4, La1.9Pr0.1NiO4, La1.8Pr0.2NiO4 and La1.9Sr0.1NiO4 to assess their stability and activity for the hydrogen peroxide reduction reaction (HPRR) in alkaline media...
July 18, 2018: Physical Chemistry Chemical Physics: PCCP
Manickam Minakshi, David R G Mitchell, Anji Reddy Munnangi, Anders J Barlow, Maximilian Fichtner
Magnesium molybdate (MgMoO4), which possesses synergistic features combining both hierarchical plate-like nanomaterials and porous architectures, has been successfully synthesized through a facile combustion synthesis at a low temperature. The hierarchical architecture is characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), scanning transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS) analyses. The as-obtained MgMoO4 nanoplates showed a porous structure with a pore-size distribution ranging from 50 to 70 nm...
July 13, 2018: Nanoscale
Elvis Robles-Marín, Alexander Mondragón, Paulina R Martínez-Alanis, Gabriel Aullón, Marcos Flores-Alamo, Ivan Castillo
Iron and molybdenum complexes supported by a pincer-type dianionic [NS2]2- donor were prepared to compare their structural, spectroscopic, and electrochemical properties. The versatility of the [NS2]2Mo(iv) complex (2) to access different oxidation states was evidenced in the activation of methanol and isopropanol, oxidising them to formaldehyde or acetone with concomitant reduction and protonation to afford [NHS2]2Mo(ii), complex (3). This redox behaviour contrasts with the null reactivity observed for the analogous ferric complex [NS2][NHS2]Fe(iii) (1)...
June 28, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Chin-May Ngue, Ching-Wen Chiu, Gene-Hsiang Lee, Shie-Ming Peng, Man-Kit Leung, Chen-I Yang, Yen-Hsiang Liu, Kuang-Lieh Lu
A new 3D coordination polymer {[Co2(μ-OH2)(TTPA)(DTDN)2·DMF]·H2O}n (1, TTPA = tris(4-(1H-1,2,4-triazol-1-yl)phenyl)amine, DTDN = 6,6'-dithiodinicotinate) was synthesised and characterised. The redox properties of this framework were elucidated by solid state electrochemical and spectroelectrochemical data. This is the first investigation of the redox behaviour of TTPA in coordination polymers. Furthermore, the incorporation of a paramagnetic Co(ii) metal ion into the framework caused 1 to show spin-flop behaviour as the result of a field-induced magnetic transition...
July 17, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Cosmin Romanitan, Pericle Varasteanu, Iuliana Mihalache, Daniela Culita, Simona Somacescu, Razvan Pascu, Eugenia Tanasa, Sandra A V Eremia, Adina Boldeiu, Monica Simion, Antonio Radoi, Mihaela Kusko
The challenge for conformal modification of the ultra-high internal surface of nanoporous silicon was tackled by electrochemical polymerisation of 2,6-dihydroxynaphthalene using cyclic voltammetry or potentiometry and, notably, after the thermal treatment (800 °C, N2 , 4 h) an assembly of interconnected networks of graphene strongly adhering to nanoporous silicon matrix resulted. Herein we demonstrate the achievement of an easy scalable technology for solid state supercapacitors on silicon, with excellent electrochemical properties...
June 25, 2018: Scientific Reports
D Kwabena Bediako, Mehdi Rezaee, Hyobin Yoo, Daniel T Larson, S Y Frank Zhao, Takashi Taniguchi, Kenji Watanabe, Tina L Brower-Thomas, Efthimios Kaxiras, Philip Kim
Molecular-scale manipulation of electronic and ionic charge accumulation in materials is the backbone of electrochemical energy storage1-4 . Layered van der Waals (vdW) crystals are a diverse family of materials into which mobile ions can electrochemically intercalate into the interlamellar gaps of the host atomic lattice5,6 . The structural diversity of such materials enables the interfacial properties of composites to be optimized to improve ion intercalation for energy storage and electronic devices7-12 ...
June 2018: Nature
Hairul Hisham Bin Hamzah, Oliver Keattch, Derek Covill, Bhavik Anil Patel
Additive manufacturing also known as 3D printing is being utilised in electrochemistry to reproducibly develop complex geometries with conductive properties. In this study, we explored if the electrochemical behavior of 3D printed acrylonitrile butadiene styrene (ABS)/carbon black electrodes was influenced by printing direction. The electrodes were printed in both horizontal and vertical directions. The horizsontal direction resulted in a smooth surface (HPSS electrode) and a comparatively rougher surface (HPRS electrode) surface...
June 14, 2018: Scientific Reports
Stephen G Parker, Ying Yang, Simone Ciampi, Bakul Gupta, Kathleen Kimpton, Friederike M Mansfeld, Maria Kavallaris, Katharina Gaus, J Justin Gooding
For many normal and aberrant cell behaviours, it is important to understand the origin of cellular heterogeneity. Although powerful methods for studying cell heterogeneity have emerged, they are more suitable for common rather than rare cells. Exploring the heterogeneity of rare single cells is challenging because these rare cells must be first pre-concentrated and undergo analysis prior to classification and expansion. Here, a versatile capture & release platform consisting of an antibody-modified and electrochemically cleavable semiconducting silicon surface for release of individual cells of interest is presented...
June 12, 2018: Nature Communications
Andrew D Ballantyne, Jason P Hallett, D Jason Riley, Nilay Shah, David J Payne
There is a growing need to develop novel processes to recover lead from end-of-life lead-acid batteries, due to increasing energy costs of pyrometallurgical lead recovery, the resulting CO2 emissions and the catastrophic health implications of lead exposure from lead-to-air emissions. To address these issues, we are developing an iono-metallurgical process, aiming to displace the pyrometallurgical process that has dominated lead production for millennia. The proposed process involves the dissolution of Pb salts into the deep eutectic solvent (DES) Ethaline 200, a liquid formed when a 1 : 2 molar ratio of choline chloride and ethylene glycol are mixed together...
May 2018: Royal Society Open Science
Cheng-Lin Liu, Ze Sun, Gui-Min Lu, Jian-Guo Yu
Gas-evolving vertical electrode system is a typical electrochemical industrial reactor. Gas bubbles are released from the surfaces of the anode and affect the electrolyte flow pattern and even the cell performance. In the current work, the hydrodynamics induced by the air bubbles in a cold model was experimentally and numerically investigated. Particle image velocimetry and volumetric three-component velocimetry techniques were applied to experimentally visualize the hydrodynamics characteristics and flow fields in a two-dimensional (2D) plane and a three-dimensional (3D) space, respectively...
May 2018: Royal Society Open Science
Xinyi Chia, Martin Pumera
Studies on layered transition metal dichalcogenides (TMDs), in particular for Group VIB TMDs like MoS2 and WS2, have long reached a crescendo in the realms of electrochemical applications initiated by their remarkable catalytic and electronic properties. One area that garnered considerable attention is the fervent pursuit of layered TMDs as electrocatalysts for hydrogen evolution reaction (HER), driven by global efforts towards reducing carbon footprint and attaining hydrogen economy. This Tutorial Review captures the essence of electrochemistry of different classes of layered TMDs and metal chalcogenides across the period table and showcases their tuneable electrochemical and HER catalytic attributes that are governed by the elemental composition, structure and anisotropy...
June 8, 2018: Chemical Society Reviews
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