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Corina Andronescu, Sabine Seisel, Patrick Wilde, Stefan Barwe, Justus Masa, Yen-Ting Chen, Edgar Ventosa, Wolfgang Schuhmann
NiFe layered double hydroxide is inarguably the most ac¬tive contemporary catalyst for the oxygen evolution reaction under alkaline conditions. However, the ability to sustain unattenuated per-formance under challenging industrial conditions entailing high corro¬sivity of the electrolyte (~30 wt.% KOH), high temperature (> 80 oC) and high current densities (> 500 mA cm-2) is the ultimate criterion for practical viability. Here, we evaluate the chemical and structural stabi¬lity of NiFe LDH at conditions akin to practical electrolysis, in 30 % KOH at 80 °C, however, without electrochemical polarization, and the resulting impact on the OER performance of the catalyst...
June 22, 2018: Chemistry: a European Journal
Yuan Huang, Eli Sutter, Liangmei Wu, Hong Xu, Lihong Bao, Hong-Jun Gao, Xingjiang Zhou, Peter Sutter
Layered semiconductors show promise as channel materials for field-effect transistors (FETs). Usually, such devices incorporate solid back or top gate dielectrics. Here, we explore de-ionized (DI) water as a solution top gate for field-effect switching of layered semiconductors including SnS2, MoS2, and black phosphorus. The DI water gate is easily fabricated, can sustain rapid bias changes, and its efficient coupling to layered materials provides high on-off current ratios, near-ideal sub-threshold swing, and enhanced short-channel behavior even for FETs with thick, bulk-like channels where such control is difficult to realize with conventional back-gating...
June 21, 2018: ACS Applied Materials & Interfaces
R Lopez-Martos, L-M Gonzalez-Perez, P Ruiz-Canela-Mendez, F-J Urresti-Lopez, J-L Gutierrez-Perez, P Infante-Cossio
BACKGROUND: To assess whether the techniques of percutaneous needle electrolysis (PNE) and deep dry needling (DDN) used on trigger points (TrP) of lateral pterygoid muscle (LPM) can significantly reduce pain and improve function in patients with myofascial pain syndrome (MPS) compared to a control group treated with a sham needling procedure (SNP). MATERIAL AND METHODS: Sixty patients diagnosed with MPS in the LPM were selected and randomly assigned to one of three groups...
June 20, 2018: Medicina Oral, Patología Oral y Cirugía Bucal
Keiko Motozawa, Mitsuru Motoyoshi, Akari Saiki, Hideto Sasaki, Noriyoshi Shimizu, Masatake Asano
Acid-electrolyzed functional water (FW) is obtained through the electrolysis of sodium chloride solution. Stimulation of the human fibroblastic cell line HeLa by FW led to the augmented secretion of basic fibroblast growth factor (bFGF). Immunoprecipitation followed by Western blot analysis revealed that both high and low molecular weight isoforms of bFGF were secreted in response to FW treatment. To explore intracellular bFGF localization, a cell fractionation assay was performed. Despite the presence of nuclear localization signals within the N-terminal portion of these proteins, the high molecular weight isoforms (34, 24, 22...
June 20, 2018: Journal of Cellular Biochemistry
Hamidreza Pourzamani, Nezamaddin Mengelizadeh, Yaghoub Hajizadeh, Hamed Mohammadi
The electro-oxidation treatment of aqueous solution containing diclofenac (DCF) on a Ti/RuO2 -TiO2 electrode in the presence of multi-walled carbon nanotubes (MWCNTs) was studied in a three-dimensional electrochemical (3DE) reactor. The response surface methodology (RSM) based on central composite design (CCD) was utilized to determine the influence of different factors. The results revealed that the obtained polynomial experimental model had a high coefficient of determination (R2  = 0.9762) based on analysis of variance...
June 20, 2018: Environmental Science and Pollution Research International
Yanyu Wu, José M Veleta, Diya Tang, Alex D Price, Cristian E Botez, Dino Villagrán
Herein, we report a crystalline CoTcPP-based [TcPP = the anion of meso-tetra(4-carboxyphenyl)porphyrin] polymeric system, 1, as a hydrogen evolution reaction (HER) electrocatalyst in acidic aqueous media. The material was characterized by powder X-ray diffraction (p-XRD), Fourier transform infrared (FT-IR) spectroscopy, and energy dispersive X-ray (EDX) analysis and its morphology was probed by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Polymer 1 shows a surface area of 441...
June 20, 2018: Dalton Transactions: An International Journal of Inorganic Chemistry
Cong Wang, Ming Zhou, Yuan-Yuan Ma, Hua-Qiao Tan, Yong-Hui Wang, Yang-Guang Li
The rational design and development of efficient and affordable enzyme-free electrocatalysts for electrochemical detection are of great significance for the large-scale applications of sensing materials, and have aroused increasing research interests. In this paper, we report that a typical polyoxometalate (POM)-based metal-organic framework (NENU5) hybridized with ketjenblack (KB) is a highly efficient electrochemical sensing catalyst, which can be used for highly sensitive nonenzymatic H2O2 detection. The composite catalyst exhibited superb electrochemical detection performance towards H2O2, including a broad linear range from 10 μM to 50 mM, a low detection limit of 1...
June 19, 2018: Chemistry, An Asian Journal
Heonjae Jeong, Edmund G Seebauer, Elif Ertekin
Properties related to transport such as self-diffusion coefficients are relevant to fuel cells, electrolysis cells, and chemical/gas sensors. Prediction of self-diffusion coefficients from first-principles involves precise determination of both enthalpy and entropy contributions for point defect formation and migration. We use first-principles density functional theory to estimate the self-diffusion coefficient for neutral O0i and doubly ionized Oi2- interstitial oxygen in rutile TiO2 and compare the results to prior isotope diffusion experiments...
June 18, 2018: Physical Chemistry Chemical Physics: PCCP
Yue Zhang, Lu Gao, Emiel J M Hensen, Jan P Hofmann
The evaluation of the stability of emerging earth-abundant metal phosphide electrocatalysts by solely electrochemical current-potential sweeps is often not conclusive. In this study, we investigated Co2 P to evaluate its stability under both acidic (0.5 M H2 SO4 ) and alkaline (1.0 M KOH) hydrogen evolution (HER) conditions. We found that the electrochemical surface area (ECSA) of Co2 P only slightly increased in acidic conditions but almost doubled after electrolysis in alkaline electrolyte. The surface composition of the electrode remained almost unchanged in acid but was significantly altered in alkaline during current-potential sweeps...
June 8, 2018: ACS Energy Letters
Xiaohu Li, Irini Angelidaki, Yifeng Zhang
Biological conversion of CO2 to value-added chemicals and biofuels has emerged as an attractive strategy to address the energy and environmental concerns caused by the over-reliance on fossil fuels. In this study, an innovative microbial reverse-electrodialysis electrolysis cell (MREC), which combines the strengths of reverse electrodialysis (RED) and microbial electrosynthesis technology platforms, was developed to achieve efficient CO2 -to-value chemicals bioconversion by using the salinity gradient energy as driven energy sources...
June 14, 2018: Water Research
Wathiq Sattar Abdul-Hassan, Denis Roux, Christophe Bucher, Saioa Cobo, Florian Molton, Eric Saint-Aman, Guy Royal
We report the study of stimuli-responsive Zn(II) and Fe(II) coordination polymers (MC34+ or MC24+ with M = Fe2+ or Zn2+). These soluble metallopolymers were formed spontaneously by reaction of an organic ligand (C34+ or C24+) with one molar equivalent of metal ions. The C34+ and C24+ ligands incorporate two chelating terpyridine groups bridged by a redox responsive hinge featuring two viologen units (viologen = N,N'-dialkyl-4,4'-bipyridinium) linked either through propyl (C34+) or ethyl (C24+) chains. The viologen units in the polymer chains were reduced (1e per viologen group) either by bulk electrolysis or by visible-light irradiation carried out in the presence of a photosensitizer...
June 15, 2018: Chemistry: a European Journal
Wei Xing, Jin-Long Li, Desheng Li, Jincui Hu, Shi-Hai Deng, Yuwei Cui, Hong Yao
Combined heterotrophic and autotrophic denitrification (HAD) is a sustainable and practical method for removing nitrate from organic-limited wastewater. However, the active microorganisms responsible for denitrification in wastewater treatment have not been clearly identified. In this study, a combined micro-electrolysis, heterotrophic, and autotrophic denitrification (CEHAD) process was established. DNA-based stable isotope probing was employed to identify the active denitrifiers in reactors fed either 13 C-labeled inorganic or organic carbon source...
June 14, 2018: Environmental Science & Technology
Ana Belen Jorge, Ishanka Dedigama, Thomas S Miller, Paul Shearing, Daniel J L Brett, Paul F McMillan
Carbon nitride materials with graphitic to polymeric structures (gCNH) were investigated as catalyst supports for the proton exchange membrane (PEM) water electrolyzers using IrO₂ nanoparticles as oxygen evolution electrocatalyst. Here, the performance of IrO₂ nanoparticles formed and deposited in situ onto carbon nitride support for PEM water electrolysis was explored based on previous preliminary studies conducted in related systems. The results revealed that this preparation route catalyzed the decomposition of the carbon nitride to form a material with much lower N content...
June 13, 2018: Nanomaterials
Arun Prakash Periasamy, Rini Ravindranath, Sakkarapalayam Murugesan Senthil Kumar, Wen-Ping Wu, Ting-Rui Jian, Huan-Tsung Chang
The preparation of cost-effective, stable catalysts for the selective reduction of carbon dioxide (CO2) to C1 products such as methanol is extremely important because methanol can be used directly as a fuel or it can be converted into other value-added products. However, the catalysts currently used for the reduction of CO2 to methanol exhibit poor selectivity, poor stability and very low faradaic efficiency. Herein, we used low-cost, stable cuprous oxide/polypyrrole (Cu2O/Ppy) particles having structures of octahedra and icosahedra (microflowers) that were prepared on linen texture (LT) papers for the selective reduction of CO2 to form a value-added single C1 product, methanol...
June 13, 2018: Nanoscale
Matthew W Glasscott, Jeffrey E Dick
We demonstrate a method to electrodeposit and observe the electrocatalysis of small platinum clusters and nanoparticles (NPs) in real time as they form on an ultramicroelectrode (UME). Water droplets ( rdrop ∼ 700 nm), stabilized by sodium dodecyl sulfate (SDS), were suspended in a solution of dichloromethane (DCM) and tetrabutylammonium perchlorate ([TBA][ClO4 ]), which was used to mitigate charge balance during droplet electrolysis. When droplets collided with an UME biased sufficiently negative to drive water reduction, large blips of current were observed...
June 13, 2018: Analytical Chemistry
Zong Liu, Xu Yu, Huaguang Yu, Huaiguo Xue, Ligang Feng
The sluggish oxygen evolution reaction (OER) is still tricky in water electrolysis technique. Herein, a facile approach to fabricate highly efficient nanostructured FeNi3 incorporated by multi-non-metal elements doped carbon (FeNi3/M-C) is proposed by annealing an in situ polymerized metal-complex from economical precursors. Temperature dependence of structure and catalytic performance for OER is probed and the best pyrolysis temperature is 800oC in which the fabricated material exhibits the highest catalytic performance for OER...
June 12, 2018: ChemSusChem
Jose A Cornejo, Hua Sheng, Eran Edri, Caroline M Ajo-Franklin, Heinz Frei
By electrochemically coupling microbial and abiotic catalysts, bioelectrochemical systems such as microbial electrolysis cells and microbial electrosynthesis systems synthesize energy-rich chemicals from energy-poor precursors with unmatched efficiency. However, to circumvent chemical incompatibilities between the microbial cells and inorganic materials that result in toxicity, corrosion, fouling, and efficiency-degrading cross-reactions between oxidation and reduction environments, bioelectrochemical systems physically separate the microbial and inorganic catalysts by macroscopic distances, thus introducing ohmic losses, rendering these systems impractical at scale...
June 11, 2018: Nature Communications
Yuan Wang, Zong Liu, Hui Liu, Nian-Tzu Suen, Xu Yu, Ligang Feng
Developing Pt alternative catalyst is prerequisite to cost-effectively produce hydrogen. Herein, we demonstrate Ru2P nanoparticles (without any doping and modifications) as a highly efficient Pt-like catalyst for hydrogen evolution reaction (HER) in different pH electrolytes. Transferring hexagonal close-packed crystal structure of Ru to orthorhombic structure of Ru2P, a greatly improved catalytic activity and stability toward HER is found due to Ru-P coordination. The electronic state change originates from the P-Ru bonding structures would account for the HER activity improvement compared with Ru nanoparticles...
June 11, 2018: ChemSusChem
Jian Yu
With rapid technology progress and cost reduction, clean hydrogen from water electrolysis driven by renewable powers becomes a potential feedstock for CO2 fixation by hydrogen-oxidizing bacteria. Cupriavidus necator (formally Ralstonia eutropha), a representative member of the lithoautotrophic prokaryotes, is a promising producer of polyhydroxyalkanoates and single cell proteins. This paper reviews the fundamental properties of the hydrogen-oxidizing bacterium, the metabolic activities under limitation of individual gases and nutrients, and the value-added products from CO2 , including the products with large potential markets...
June 9, 2018: World Journal of Microbiology & Biotechnology
Naihara Wachter, José M Aquino, Marina Denadai, Juliana C Barreiro, Adilson J Silva, Quezia B Cass, Romeu C Rocha-Filho, Nerilso Bocchi
The electrochemical degradation of ciprofloxacin-CIP (50 mg L-1 in 0.10 mol L-1 Na2 SO4 ) was investigated using a double-sided Ti-Pt/β-PbO2 anode in a filter-press flow reactor, with identification of oxidation intermediates and follow-up of antimicrobial activity against Escherichia coli. The effect of solution pH, flow rate, current density, and temperature on the CIP removal rate was evaluated. All of these parameters did affect the CIP removal performance; thus, optimized electrolysis conditions were further explored: pH = 10, q V  = 6...
June 6, 2018: Environmental Science and Pollution Research International
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