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https://www.readbyqxmd.com/read/28230916/design-principles-for-covalent-organic-frameworks-as-efficient-electrocatalysts-in-clean-energy-conversion-and-green-oxidizer-production
#1
Chun-Yu Lin, Lipeng Zhang, Zhenghang Zhao, Zhenhai Xia
Covalent organic frameworks (COFs), an emerging class of framework materials linked by covalent bonds, hold potential for various applications such as efficient electrocatalysts, photovoltaics, and sensors. To rationally design COF-based electrocatalysts for oxygen reduction and evolution reactions in fuel cells and metal-air batteries, activity descriptors, derived from orbital energy and bonding structures, are identified with the first-principle calculations for the COFs, which correlate COF structures with their catalytic activities...
February 23, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28230880/atomic-layer-deposited-ultrafine-mos2-nanocrystals-on-cobalt-foam-for-efficient-and-stable-electrochemical-oxygen-evolution
#2
Dehua Xiong, Qingqing Zhang, Wei Li, Junjie Li, Xiuli Fu, M F Cerqueira, Pedro Alpuim, Lifeng Liu
Ultrafine molybdenum sulfide (MoS2) nanocrystals are grown on a porous cobalt (Co) foam current collector by atomic layer deposition (ALD) using molybdenum hexacarbonyl and hydrogen sulfide as precursors. When used to catalyze the oxygen evolution reaction (OER), the optimal Co@MoS2 electrode, even with a MoS2 loading as small as 0.06 mg cm(-2), exhibits a large cathodic shift of ca. 200 mV in the onset potential (the potential at which the current density is 5 mA cm(-2)), a low overpotential of only 270 mV to attain an anodic current density of 10 mA cm(-2), much smaller charge transfer resistance and substantially improved long-term stability at both low and high current densities, with respect to the bare Co foam electrode, showing substantial promise for use as an efficient, low-cost and durable anode in water electrolyzers...
February 23, 2017: Nanoscale
https://www.readbyqxmd.com/read/28230376/facet-dependent-thermal-instability-in-licoo2
#3
Soroosh Sharifi-Asl, Fernando A Soto, Anmin Nie, Yifei Yuan, Hasti Asayesh-Ardakani, Tara Foroozan, Vitaliy Yurkiv, Boao Song, Farzad Mashayek, Robert F Klie, Khalil Amine, Jun Lu, Perla B Balbuena, Reza Shahbazian-Yassar
Thermal runaways triggered by the oxygen release from oxide cathode materials pose a major safety concern for widespread application of lithium ion batteries. Utilizing in-situ aberration-corrected scanning transmission electron microscopy (STEM) and electron energy loss spectroscopy (EELS) at high temperatures, we show that oxygen release from LixCoO2 cathode crystals is occurring at the surface of particles. We correlated this local oxygen evolution from the LixCoO2 structure with local phase transitions spanning from layered to spinel and then to rock salt structure upon exposure to elevated temperatures...
February 23, 2017: Nano Letters
https://www.readbyqxmd.com/read/28230223/observation-of-charge-transfer-cascades-in-%C3%AE-fe2o3-irox-photoanodes-by-operando-x-ray-absorption-spectroscopy
#4
Alessandro Minguzzi, Alberto Naldoni, Ottavio Lugaresi, Elisabetta Achilli, Francesco D'Acapito, Francesco Malara, Cristina Locatelli, Alberto Vertova, Sandra Rondinini, Paolo Ghigna
Electrochemical devices for energy conversion and storage are central for a sustainable economy. The performance of electrodes is driven by charge transfer across different layer materials and an understanding of the mechanistics is pivotal to gain improved efficiency. Here, we directly observe the transfer of photogenerated charge carriers in a photoanode made of hematite (α-Fe2O3) and a hydrous iridium oxide (IrOx) overlayer, which plays a key role in photoelectrochemical water oxidation. Through the use of operando X-ray absorption spectroscopy (XAS), we probe the change in occupancy of the Ir 5d levels during optical band gap excitation of α-Fe2O3...
February 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28230184/tobacco-vein-banding-mosaic-virus-6k2-protein-hijacks-nbpsbo1-for-virus-replication
#5
Chao Geng, Zhi-Yong Yan, De-Jie Cheng, Jin Liu, Yan-Ping Tian, Chang-Xiang Zhu, Hong-Yan Wang, Xiang-Dong Li
Chloroplast-bound vesicles are key components in viral replication complexes (VRCs) of potyviruses. The potyviral VRCs are induced by the second 6 kDa protein (6K2) and contain at least viral RNA and nuclear inclusion protein b. To date, no chloroplast protein has been identified to interact with 6K2 and involve in potyvirus replication. In this paper, we showed that the Photosystem II oxygen evolution complex protein of Nicotiana benthamiana (NbPsbO1) was a chloroplast protein interacting with 6K2 of Tobacco vein banding mosaic virus (TVBMV; genus Potyvirus) and present in the VRCs...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28228514/differentiating-causality-and-correlation-in-allometric-scaling-ant-colony-size-drives-metabolic-hypometry
#6
James S Waters, Alison Ochs, Jennifer H Fewell, Jon F Harrison
Metabolic rates of individual animals and social insect colonies generally scale hypometrically, with mass-specific metabolic rates decreasing with increasing size. Although this allometry has wide ranging effects on social behaviour, ecology and evolution, its causes remain controversial. Because it is difficult to experimentally manipulate body size of organisms, most studies of metabolic scaling depend on correlative data, limiting their ability to determine causation. To overcome this limitation, we experimentally reduced the size of harvester ant colonies (Pogonomyrmex californicus) and quantified the consequent increase in mass-specific metabolic rates...
February 22, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28227912/a-hybrid-discrete-continuous-model-of-in-vitro-spheroid-tumor-growth-and-drug-response
#7
Giorgos Tzedakis, Evangelos Liapis, Eleftheria Tzamali, Giannis Zacharakis, Vangelis Sakkalis, Giorgos Tzedakis, Evangelos Liapis, Eleftheria Tzamali, Giannis Zacharakis, Vangelis Sakkalis, Giannis Zacharakis, Vangelis Sakkalis, Evangelos Liapis, Giorgos Tzedakis, Eleftheria Tzamali
Anti-cancer therapy efficacy in solid tumors mainly depends on drug transportation through the vasculature system and the extracellular matrix, on diffusion gradients and clonal heterogeneity within the tumor mass, as well as on the responses of the individual tumor cells to drugs and their interactions with each other and their local microenvironment. In this work, we develop a mathematical predictive model for tumor growth and drug response based on 3D spheroids experiments that possess several in vivo features of tumors and are considered better for drug screening...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225759/crystallization-of-silicon-dioxide-and-compositional-evolution-of-the-earth-s-core
#8
Kei Hirose, Guillaume Morard, Ryosuke Sinmyo, Koichio Umemoto, John Hernlund, George Helffrich, Stéphane Labrosse
The Earth's core is about ten per cent less dense than pure iron (Fe), suggesting that it contains light elements as well as iron. Modelling of core formation at high pressure (around 40-60 gigapascals) and high temperature (about 3,500 kelvin) in a deep magma ocean predicts that both silicon (Si) and oxygen (O) are among the impurities in the liquid outer core. However, only the binary systems Fe-Si and Fe-O have been studied in detail at high pressures, and little is known about the compositional evolution of the Fe-Si-O ternary alloy under core conditions...
February 22, 2017: Nature
https://www.readbyqxmd.com/read/28225131/modification-of-n-doped-tio2-photocatalysts-using-noble-metals-pt-pd-a-combined-xps-and-dft-study
#9
K Batalović, N Bundaleski, J Radaković, N Abazović, M Mitrić, R A Silva, M Savić, J Belošević-Čavor, Z Rakočević, C M Rangel
Nitrogen-doped TiO2 (N-TiO2) is considered as one of the most promising materials for various photocatalytic applications, while noble metals Pd and Pt are known as good catalysts for hydrogen evolution. This work focuses on the determination of structural and electronic modifications of N-TiO2, achieved by noble metal deposition at the surface, as a starting indicator for potential applications. We focus on the properties of easily synthesized nanocrystalline nitrogen-doped anatase TiO2, modified by depositing small amounts of Pd (0...
February 22, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28224144/facile-synthesis-of-3d-porous-co3v2o8-nanoroses-and-2d-nico2v2o8-nanoplates-for-high-performance-supercapacitors-and-their-electrocatalytic-oxygen-evolution-reaction-properties
#10
Jingchao Zhang, Baiqing Yuan, Shufang Cui, Nana Zhang, Jingjing Wei, Xiao Wang, Daojun Zhang, Renchun Zhang, Qisheng Huo
Binary metal oxides have recently attracted extensive attention from researchers in the energy storage and conversion field due to their high energy densities and multiple oxidation states. Novel 3D Co3V2O8 porous rose-like structures and 2D NiCo2V2O8 nanoplates were facilely synthesized via a solvothermal method, and the morphologies, Ni/Co ratios, and surface area of these samples can be easily tuned in the same procedure. The as-prepared Co3V2O8 porous rose-like structure exhibited good electrocatalytic oxygen evolution performance with excellent activity and stability...
February 22, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28222601/energy-related-small-molecule-activation-reactions-oxygen-reduction-and-hydrogen-and-oxygen-evolution-reactions-catalyzed-by-porphyrin-and-corrole-based-systems
#11
Wei Zhang, Wenzhen Lai, Rui Cao
Globally increasing energy demands and environmental concerns related to the use of fossil fuels have stimulated extensive research to identify new energy systems and economies that are sustainable, clean, low cost, and environmentally benign. Hydrogen generation from solar-driven water splitting is a promising strategy to store solar energy in chemical bonds. The subsequent combustion of hydrogen in fuel cells produces electric energy, and the only exhaust is water. These two reactions compose an ideal process to provide clean and sustainable energy...
February 22, 2017: Chemical Reviews
https://www.readbyqxmd.com/read/28221033/molecule-level-g-c3n4-coordinated-transition-metals-as-a-new-class-of-electrocatalysts-for-oxygen-electrode-reactions
#12
Yao Zheng, Yan Jiao, Yihan Zhu, Qiran Cai, Anthony Vasileff, Lu Hua Li, Yu Han, Ying Chen, Shi Zhang Qiao
Organometallic complexes with metal-nitrogen/carbon (M-N/C) coordination are the most important alternatives to precious metal catalysts for oxygen reduction and evolution reactions (ORR and OER) in energy conversion devices. Here, we designed and developed a range of molecule-level graphitic carbon nitride (g-C3N4) coordinated transition metals (M-C3N4) as a new generation of M-N/C catalysts for these oxygen electrode reactions. As a proof-of-concept example, we conducted theoretical evaluation and experimental validation on a cobalt-C3N4 catalyst with a desired molecular configuration, which possesses comparable electrocatalytic activity to that of precious metal benchmarks for the ORR and OER in alkaline media...
February 21, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28220851/first-evidence-of-denitrification-vis-%C3%A3-vis-monsoon-in-the-arabian-sea-since-late-miocene
#13
Shubham Tripathi, Manish Tiwari, Jongmin Lee, Boo-Keun Khim
In the Arabian Sea, South Asian monsoon (SAM)-induced high surface water productivity coupled with poor ventilation of intermediate water results in strong denitrification within the oxygen minimum zone (OMZ). Despite the significance of denitrification in the Arabian Sea, we have no long-term record of its evolution spanning the past several million years. Here, we present the first record of denitrification evolution since Late Miocene (~10.2 Ma) in the Eastern Arabian Sea, where the SAM generates moderate surface water productivity, based on the samples retrieved during the International Ocean Discovery Program (IODP) Expedition 355...
February 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28220508/quantitative-long-term-measurements-of-burns-in-a-rat-model-using-spatial-frequency-domain-imaging-sfdi-and-laser-speckle-imaging-lsi
#14
Adrien Ponticorvo, David M Burmeister, Rebecca Rowland, Melissa Baldado, Gordon T Kennedy, Rolf Saager, Nicole Bernal, Bernard Choi, Anthony J Durkin
BACKGROUND AND OJECTIVES: The current standard for diagnosis of burn severity and subsequent wound healing is through clinical examination, which is highly subjective. Several new technologies are shifting focus to burn care in an attempt to help quantify not only burn depth but also the progress of healing. While accurate early assessment of partial thickness burns is critical for dictating the course of treatment, the ability to quantitatively monitor wound status over time is critical for understanding treatment efficacy...
February 21, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28218825/sulfur-modified-graphitic-carbon-nitride-nanostructures-as-an-efficient-electrocatalyst-for-water-oxidation
#15
Vinayak S Kale, Uk Sim, Jiwoong Yang, Kyoungsuk Jin, Sue In Chae, Woo Je Chang, Arun Kumar Sinha, Heonjin Ha, Chan-Cuk Hwang, Junghyun An, Hyo-Ki Hong, Zonghoon Lee, Ki Tae Nam, Taeghwan Hyeon
There is an urgent need to develop metal-free, low cost, durable, and highly efficient catalysts for industrially important oxygen evolution reactions. Inspired by natural geodes, unique melamine nanogeodes are successfully synthesized using hydrothermal process. Sulfur-modified graphitic carbon nitride (S-modified g-CN x ) electrocatalysts are obtained by annealing these melamine nanogeodes in situ with sulfur. The sulfur modification in the g-CN x structure leads to excellent oxygen evolution reaction activity by lowering the overpotential...
February 20, 2017: Small
https://www.readbyqxmd.com/read/28218314/implicating-the-contributions-of-surface-and-bulk-states-on-carrier-trapping-and-photocurrent-performance-of-bivo4-photoanodes
#16
B Pattengale, J Huang
Monoclinic-scheelite BiVO4 has been widely studied as a promising oxygen evolution reaction (OER) catalyst in artificial photosynthesis. Though significant progress to improve or augment its catalysis performance has been made, fundamental understanding of its relatively poor performance as a bare material is lacking. In this paper, we report the correlation of the surface structure and trap states with charge separation efficiency and OER performance of bare BiVO4 photoanodes via varying the sample thickness...
February 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28215087/microwave-initiated-facile-formation-of-ni3se4-nanoassemblies-for-enhanced-and-stable-water-splitting-in-neutral-and-alkaline-media
#17
Sengeni Anantharaj, Jeevarathinam Kennedy, Subrata Kundu
Molecular hydrogen (H2) generation through water splitting with minimum energy loss has become practically possible due to the recent evolution of high performance electrocatalysts. In this study, we had fabricated, evaluated and presented such a high performance catalyst which is the Ni3Se4 nanoassemblies that can efficiently catalyze water splitting in neutral and alkaline media. A hierarchical nanoassemblies of Ni3Se4 was fabricated by functionalizing the surface cleaned Ni foam using NaHSe solution as Se source with the assistance of microwave irradiation (300 W) for 3 min followed by 5 h of aging at room temperature (RT)...
February 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211670/facile-synthesis-of-unique-hexagonal-nanoplates-of-zn-co-hydroxy-sulfate-for-efficient-electrocatalytic-oxygen-evolution-reaction
#18
Soumen Dutta, Chaiti Ray, Yuichi Negishi, Tarasankar Pal
Cost-effective, highly active water oxidation catalysts are becoming increasingly demanding in the field of energy conversion and storage. Herein, simple modified hydrothermally (MHT) synthesized zinc and cobalt based hydroxyl double salt i.e., Zn4-xCoxSO4(OH)6• 0.5 H2O (ZCS) has been exfoliated for the first time as an efficient electrocatalyst for oxygen evolution reaction (OER) in alkaline medium. Morphology investigation suggests the evolution of unique hexagonal nanoplates of ZCS material. As OER catalyst, it requires only 370 and 450 mV overpotential to achieve 10 and 100 mA cm-2 current density respectively...
February 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28211275/suppression-of-hydrogen-evolution-by-oxygen-reduction-in-nanoporous-electrocatalysts
#19
Ellen Benn, Bernard Gaskey, Jonah D Erlebacher
Electroreduction of small molecules in aqueous solution often competes with the hydrogen evolution reaction (HER), especially if the reaction is driven even moderately hard using a large overpotential. Here, the oxygen reduction reaction (ORR) was studied under proton diffusion-limited conditions in slightly acidic electrolytes - a model system to study the relative transport kinetics of protons and reactants to an electrocatalyst and the relationship between transport and catalytic performance. Using dealloyed nanoporous nickel-platinum (np-NiPt) electrodes, we find the hydrogen evolution reaction can be completely suppressed even at high overpotentials (-400 mV vs...
February 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28207229/efficient-and-durable-bifunctional-oxygen-catalysts-based-on-nifeo-mnox-core-shell-structures-for-rechargeable-zn-air-batteries
#20
Yi Cheng, Shuo Dou, Jean-Pierre Veder, Shuangyin Wang, Martin Saunders, San Ping Jiang
Rechargeable Zn-air battery is limited by the sluggish kinetics and poor durability of the oxygen catalysts. In this paper, a new bifunctional oxygen catalyst has been developed through embedding the ultrafine NiFeO nanoparticles (NPs) in a porous amorphous MnOx layer, in which the NiFeO-core contributes to the high activity for oxygen evolution reaction (OER) and the amorphous MnOx-shell functions as active phase for oxygen evolution reaction (OER), promoted by the synergistic effect between the NiFeO core and MnOx shell...
February 16, 2017: ACS Applied Materials & Interfaces
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