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https://www.readbyqxmd.com/read/28525707/self-organized-growth-of-two-dimensional-gate-nanosheet-on-zno-nanowires-for-heterojunctional-water-splitting-applications
#1
Qiuguo Li, Xinzhou Ma, Huiqiang Liu, Zuxin Chen, Hao Chen, Sheng Chu
Epitaxial two-demensional GaTe nanosheets on ZnO nanowires were routinely prepared via a two-step chemical vapour deposition procedure. The epitaxial relationship and growth mechanism of the GaTe/ZnO core/shell structures were explored and attributed to a layer-over-layer model. The hybrid structures increased the surface area and the favorable p-n heterojunction enhanced the charge separation for photoelectrochemical performance in water splitting. The above synergistic effects boosted the photocurrent density from -0...
May 19, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28516994/3d-ordered-porous-moxc-x-1-or-2-for-advanced-hydrogen-evolution-and-li-storage
#2
Hong Yu, Haosen Fan, Jiong Wang, Yun Zheng, Zhengfei Dai, Yizhong Lu, Junhua Kong, Xin Wang, Young Jin Kim, Qingyu Yan, Jong-Min Lee
3D ordered porous structures of MoxC are prepared with different Mo to C ratios and tested for two possible promising applications: hydrogen evolution reaction (HER) through water splitting and lithium ion batteries (LIBs). Mo2C and MoC with 3D periodic ordered structures are prepared with a similar process but different precursors. The 3D ordered porous MoC exhibits excellent cycling stability and rate performance as an anode material for LIBs. A discharge capacity of 450.9 mA h g(-1) is maintained up to 3000 cycles at 10...
May 18, 2017: Nanoscale
https://www.readbyqxmd.com/read/28516511/electrochemically-treated-bivo4-photoanode-for-efficient-photoelectrochemical-water-splitting
#3
Lianzhou Wang
BiVO4 films with (040) facet grown vertically on fluorine doped SnO2 (FTO) glass substrates are prepared by a seed-assisted hydrothermal method. A simple electrochemical treatment process drastically enhances the photocatalytic activity of BiVO4, exhibiting a remarkable photocurrent density of 2.5 mA cm-2 at 1.23 V vs. reversible hydrogen electrode (RHE) under AM 1.5 G illumination, which is approximately 10 folds higher than that of the pristine one. Loading cobalt borate (CoBi) as cocatalyst, the photocurrent density of the BiVO4 photoanode can be further improved to 3...
May 17, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28510292/enhanced-photoelectrochemical-activity-by-autologous-cd-cdo-cds-heterojunction-photoanode-with-high-conductivity-and-separation-efficiency
#4
Shilei Xie, Peng Zhang, Min Zhang, Peng Liu, Wei Li, Xihong Lu, Faliang Cheng, Yexiang Tong
The development of hydrogen from solar energy has attracted great attention due to the global demand for clean energy and environment. Herein, autologous Cd/CdO/CdS heterojunctions was prepared by carefully controlling process with the metallic Cd as the inner-layer and CdO as the interlayer. Further research revealed that the transportation and separation of photogenerated pairs were enhanced due to low resistance of Cd inner-layer and the type-II CdO/CdS heterojunction. As a result, the optimized Cd/CdO/CdS heterojunction photoanode showed outstanding and long-term photoelectrochemical activity for the water splitting, with the current density of 3...
May 16, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28501214/capillary-electrophoresis-tandem-mass-spectrometry-determination-of-glutamic-acid-and-homocysteine-s-metabolites-potential-biomarkers-of-amyotrophic-lateral-sclerosis
#5
Zuzana Cieslarova, Fernando Silva Lopes, Claudimir Lucio do Lago, Marcondes Cavalcante França, Ana Valéria Colnaghi Simionato
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects both lower and upper motor neurons, leading to muscle atrophy, paralysis, and death caused by respiratory failure or infectious complications. Altered levels of homocysteine, cysteine, methionine, and glutamic acid have been observed in plasma of ALS patients. In this context, a method for determination of these potential biomarkers in plasma by capillary electrophoresis tandem mass spectrometry (CE-MS/MS) is proposed herein. Sample preparation was carefully investigated, since sulfur-containing amino acids may interact with plasma proteins...
August 1, 2017: Talanta
https://www.readbyqxmd.com/read/28497820/reducibility-of-zro2-pt3zr-and-zro2-pt-2d-films-compared-to-bulk-zirconia-a-dft-u-study-of-oxygen-removal-and-h2-adsorption
#6
Antonio Ruiz Puigdollers, Gianfranco Pacchioni
Oxide reducibility is an important property that determines the chemical and physical behavior of the materials under working conditions. Zirconia is a non-reducible oxide that exhibits high resistance to the loss of oxygen and low reactivity towards hydrogen, two typical processes involved in oxide reduction. Oxide reducibility can change substantially by nanostructuring (e.g. formation of nanoparticles). In this study, we investigate theoretically by means of DFT+U calculations including dispersion interactions the properties of 2D zirconia films supported on a Pt3Zr alloy and Pt metal surfaces, two systems recently prepared experimentally...
May 12, 2017: Nanoscale
https://www.readbyqxmd.com/read/28494068/a-comparison-of-costal-cartilage-warping-using-oblique-split-vs-concentric-carving-methods
#7
Gemma C Wilson, Laura Dias, Callum Faris
Importance: Warping of costal cartilage is well described; however, its strength and abundance still make it a desirable graft material, especially in complex reconstructive rhinoplasty. Despite multiple methods of cartilage harvest, carving, and preimplantation treatment being developed over the years, warp remains a challenging clinical problem. Objective: To assess whether the 30° oblique split method of preparing costal cartilage grafts produces less warping of the graft than the current standard of harvesting the central segment of a rib using the concentric carving method...
May 11, 2017: JAMA Facial Plastic Surgery
https://www.readbyqxmd.com/read/28493681/self-assembled-molecular-hybrids-of-cos-dna-for-enhanced-water-oxidation-with-low-cobalt-content
#8
Kannimuthu Karthick, Sengeni Anantharaj, Pitchiah E Karthik, Balasubramanian Subramanian, Subrata Kundu
Water oxidation in alkaline medium was efficiently catalyzed by the self-assembled molecular hybrids of CoS-DNA that had 20 times lower Co loading than the commonly used loading. The morphological outcome was directed by varying the molar ratio of metal precursor Co(Ac)2 and DNA and three different sets of CoS-DNA molecular hybrids, viz. CoS-DNA(0.036), CoS-DNA(0.06), and CoS-DNA(0.084) were prepared. These morphologically distinct hybrids had shown similar electrocatalytic behavior, because of the fact that they all contained the same cobalt content...
May 11, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28490484/developing-a-decision-rule-to-optimise-clinical-pharmacist-resources-for-medication-reconciliation-in-the-emergency-department
#9
Sabrina De Winter, Peter Vanbrabant, Pieter Laeremans, Veerle Foulon, Ludo Willems, Sandra Verelst, Isabel Spriet
BACKGROUND: The process of obtaining a complete medication history for patients admitted to the hospital from the ED at hospital admission, without discrepancies, is error prone and time consuming. OBJECTIVES: The goal of this study was the development of a clinical decision rule (CDR) with a high positive predictive value in detecting ED patients admitted to hospital at risk of at least one discrepancy during regular medication history acquisition, along with favourable feasibility considering time and budget constraints...
May 10, 2017: Emergency Medicine Journal: EMJ
https://www.readbyqxmd.com/read/28488905/tactical-behaviours-in-men-s-800m-olympic-and-world-championship-medallists-a-changing-of-the-guard
#10
Gareth N Sandford, Simon Pearson, Sian V Allen, Rita M Malcata, Andrew E Kilding, Angus Ross, Paul B Laursen
PURPOSE: To assess the longitudinal evolution of tactical behaviours used to medal in Men's 800m (M800) Olympic Games (OG) or World Championship (WC) events in the recent competition era (2000-2016). METHODS: Thirteen OG and WC events were characterised for first and second lap splits using available footage from YouTube. Positive pacing strategies were defined as a faster first lap. Season's best M800 time and world ranking, reflective of an athlete's 'peak condition', was obtained to determine relationships between adopted tactics and physical condition prior to the championships...
May 10, 2017: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/28485955/field-induced-co-ii-single-ion-magnets-with-mer-directing-ligands-but-ambiguous-coordination-geometry
#11
Yan Peng, Valeriu Mereacre, Christopher E Anson, Yiquan Zhang, Tilmann Bodenstein, Karin Fink, Annie K Powell
Three air-stable Co(II) mononuclear complexes with different aromatic substituents have been prepared and structurally characterized by single-crystal X-ray diffraction. The mononuclear complexes [Co(H2L1)2]·2THF (1), [Co(HL2)2] (2), and [Co(H2L3)2]·CH2Cl2 (3) (where H3L1, H2L2, and H3L3 represent 3-hydroxy-naphthalene-2-carboxylic acid (6-hydroxymethyl-pyridin-2-ylmethylene) hydrazide, nicotinic acid (6-hydroxymethyl-pyridin-2-ylmethylene) hydrazide, and 2-hydroxy-benzoic acid (6-hydroxymethyl-pyridin-2-ylmethylene) hydrazide, respectively) feature a distorted mer octahedral coordination geometry...
May 9, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28482648/enhanced-photoelectrochemical-behavior-of-h-tio2-nanorods-hydrogenated-by-controlled-and-local-rapid-thermal-annealing
#12
Xiaodan Wang, Sonia Estradé, Yuanjing Lin, Feng Yu, Lluis Lopez-Conesa, Hao Zhou, Sanjeev Kumar Gurram, Francesca Peiró, Zhiyong Fan, Hao Shen, Lothar Schaefer, Guenter Braeuer, Andreas Waag
Recently, colored H-doped TiO2 (H-TiO2) has demonstrated enhanced photoelectrochemical (PEC) performance due to its unique crystalline core-disordered shell nanostructures and consequent enhanced conduction behaviors between the core-shell homo-interfaces. Although various hydrogenation approaches to obtain H-TiO2 have been developed, such as high temperature hydrogen furnace tube annealing, high pressure hydrogen annealing, hydrogen-plasma assisted reaction, aluminum reduction and electrochemical reduction etc...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28481106/component-controlled-synthesis-of-necklace-like-hollow-nixruy-nanoalloys-as-electrocatalysts-for-hydrogen-evolution-reaction
#13
Caihua Zhang, Ying Liu, Yingxue Chang, Yanan Lu, Shulin Zhao, Dongdong Xu, Zhihui Dai, Min Han, Jianchun Bao
Developing highly efficient and long-durable nanoalloy electrocatalysts toward the hydrogen evolution reaction (HER) are highly desirable for implementation of the water-splitting technique to prepare clean fuels. Though great progress has been achieved, controllable synthesis of hollow NixRuy nanoalloys with a wide component ratio range remains a challenge and their applications for HER have not been explored. Here, a series of necklace-like hollow NixRuy nanoalloys (Ni72Ru28, Ni63Ru37, Ni43Ru57, and Ni29Ru71) are prepared using the galvanic replacement reaction between the Ni nanochains and RuCl3·3H2O and the hollowing process based on the Kirkendall effect...
May 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28480875/plasma-induced-nanoporous-metal-oxides-with-nitrogen-doping-for-high-performance-electrocatalysis
#14
Min Wang
Oxygen evolution reaction (OER) is a critical reaction in energy storage and conversion systems such as metal air batteries and water splitting. The current commercial OER catalysts are the noble metal based materials, which have a high cost and scarcity on the earth. L. Xu et al., have prepared the nanoporous N-Co3O4 materials as cost-effective and high efficient electrocatalysts for OER by the N2 plasma. This work has successfully demonstrated the simple N2 plasma treatment to be a powerful technique to introduce the nitrogen doping and nanoporous structure in the bulk materials, enhancing the performance of electrochemical catalysis...
May 8, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28474426/molybdenum-carbide-based-electrocatalysts-for-hydrogen-evolution-reaction
#15
Xin Wang, Baoyu Xia, Ya Yan, Mao Miao, Jing Pan, Ting He
Electrocatalytic water splitting is a promising approach for clean and sustainable hydrogen production. Its large scale application relies on the availability of low cost and efficient electrocatalysts. Earth-abundant transition metal carbides, especially molybdenum carbides (MoxC), are regarded as the potential candidates to replace the state-of-art but expensive platinum-group electrocatalysts. In this review, we summarize recent progress on MoxC electrocatalyst for hydrogen evolution reaction (HER). Nanostructure engineering on the design and preparation of highly efficient electrocatalyst based on MoxC is presented, followed by the comparison and discussion of HER performance on MoxC-based electrocatalysts...
May 4, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28470324/a-facile-hydrothermal-synthesis-of-carbon-dots-modified-g-c3n4-for-enhanced-photocatalytic-h2-evolution-performance
#16
Xuefei Wang, Jingjing Cheng, Huogen Yu, Jiaguo Yu
Carbon dots (CDs)/g-C3N4 is a promising photocatalyst to split water for H2 production; however, the synthesis of CDs/g-C3N4 is usually rigorous and involves multiple steps, which limits its practical application. In this study, a facile hydrothermal approach was developed to prepare CDs/g-C3N4 photocatalysts using l-ascorbic acid and g-C3N4 as the precursors. Upon in situ thermal polymerization of l-ascorbic acid on the g-C3N4 surface, the carbon dots were homogeneously and solidly modified on the g-C3N4 surface...
May 16, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28451953/observing-proton-transfer-reactions-inside-the-maldi-plume-experimental-and-theoretical-insight-into-maldi-gas-phase-reactions
#17
Mario F Mirabelli, Renato Zenobi
We evaluated the contribution of gas-phase in-plume proton transfer reactions to the formation of protonated and deprotonated molecules in the MALDI process. A split sample holder was used to separately deposit two different samples, which avoids any mixing during sample preparation. The two samples were brought very close to each other and desorbed/ionized by the same laser pulse. By using a combination of deuterated and non-deuterated matrices, it was possible to observe exclusively in-plume proton transfer processes...
April 27, 2017: Journal of the American Society for Mass Spectrometry
https://www.readbyqxmd.com/read/28451671/defect-promoted-photo-electrochemical-performance-enhancement-of-orange-luminescent-zno-nanorod-arrays
#18
Jan Kegel, Fathima Laffir, Ian M Povey, Martyn E Pemble
Intentionally defect-rich zinc oxide (ZnO) nanorod-arrays were grown from solution by carefully adjusting the concentration ratio of the growth-precursors used followed by various post-deposition thermal treatments. Post-deposition rapid thermal annealing (RTA) at moderate temperatures (350 °C-550 °C) and in various atmospheres was applied to vary the defect composition of the grown nanorod-arrays. It is demonstrated that, intense, defect-related orange emission occurs solely upon RTA around 450 °C and is essentially independent of the atmosphere used...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28451361/vapor-solid-synthesis-of-monolithic-single-crystalline-cop-nanowire-electrodes-for-efficient-and-robust-water-electrolysis
#19
Wei Li, Xuefei Gao, Dehua Xiong, Fang Xia, Jian Liu, Wei-Guo Song, Junyuan Xu, Sitaramanjaneya Mouli Thalluri, M F Cerqueira, Xiuli Fu, Lifeng Liu
Electrochemical water splitting into hydrogen and oxygen is a promising technology for sustainable energy storage. The development of earth-abundant transition metal phosphides (TMPs) to catalyze the hydrogen evolution reaction (HER) and TMP-derived oxy-hydroxides to catalyze the oxygen evolution reaction (OER) has recently drawn considerable attention. However, most monolithically integrated metal phosphide electrodes are prepared by laborious multi-step methods and their operational stability at high current densities has been rarely studied...
April 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28448598/a-low-volume-polyethylene-glycol-solution-was-associated-with-an-increased-suboptimal-bowel-preparation-rate-but-had-similar-recommendations-for-an-early-repeat-colonoscopy-procedure-times-and-adenoma-detection-rates
#20
Sam C Hankins, Bryan B Brimhall, Vineel Kankanala, Gregory L Austin
BACKGROUND/AIMS: Low-volume polyethylene glycol (PEG) bowel preparations are better tolerated by patients than high-volume preparations and may achieve similar preparation quality. However, there is little data comparing their effects on a recommendation for an early repeat colonoscopy (because of a suboptimal preparation), procedure times, adenoma detection rate (ADR), and advanced adenoma detection rate (AADR). METHODS: This is a retrospective cohort study of outpatient colonoscopies performed during a one-year period at a single academic medical center in which low-volume MoviPrep® (n = 1841) or high-volume Colyte® (n = 1337) was used...
2017: PloS One
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