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https://www.readbyqxmd.com/read/27904896/rapid-synthesis-of-ultralong-fe-oh-3-cu-oh-2-core-shell-nanowires-self-supported-on-copper-foam-as-a-highly-efficient-3d-electrode-for-water-oxidation
#1
Chun-Chao Hou, Chuan-Jun Wang, Qian-Qian Chen, Xiao-Jun Lv, Wen-Fu Fu, Yong Chen
One-dimensional core-shell nanowire materials have recently received great attention as durable catalysts for water splitting. Herein we report the facile and rapid synthesis of ultralong Fe(OH)3:Cu(OH)2 core-shell nanowires grown in situ on an open 3D electrode to function as a highly efficient electrocatalyst for water oxidation. It only requires an overpotential of ∼365 mV to reach a 10 mA cm(-2) current density in 1.0 M KOH. As far as we know, this shows the best result amongst Cu-based heterogeneous OER systems reported to date...
December 1, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/27559613/self-supported-cedarlike-semimetallic-cu3p-nanoarrays-as-a-3d-high-performance-janus-electrode-for-both-oxygen-and-hydrogen-evolution-under-basic-conditions
#2
Chun-Chao Hou, Qian-Qian Chen, Chuan-Jun Wang, Fei Liang, Zheshuai Lin, Wen-Fu Fu, Yong Chen
There has been strong and growing interest in the development of cost-effective and highly active oxygen evolution reaction (OER) electrocatalysts for alternative fuels utilization and conversion devices. We report herein that semimetallic Cu3P nanoarrays directly grown on 3D copper foam (CF) substrate can function as effective electrocatalysts for water oxidation. Specifically, the surface oxidation-activated Cu3P only required a relatively low overpotential of 412 mV to achieve a current density of 50 mA cm(-2) and displayed a small Tafel slope of 63 mV dec(-1) in 0...
September 7, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27548518/extrapolation-ionization-chamber-dosimetry-of-fluorescent-x-ray-energies-from-4-5-to-19-6-kev
#3
Joseph T Rakowski, Mark A Tucker, Michael G Snyder, Simon P Makar, Mark Yudele, Jay Burmeister, Michael C Joiner
Characteristic X rays of energies less than approximately 20 keV are of interest in radiobiology and radiation oncology. There is evidence that these low-energy photons produce higher relative biological effectiveness (RBE) and lower oxygen enhancement ratio (OER) relative to higher energies. Lower energy X rays also offer the advantage of healthy tissue sparing beyond the target treatment depth. Electronic brachytherapy systems that can deliver characteristic and bremsstrahlung X rays of varying energy are in clinical use as well as under development...
September 2016: Radiation Research
https://www.readbyqxmd.com/read/27530422/a-copper-porphyrin-based-conjugated-mesoporous-polymer-derived-bifunctional-electrocatalyst-for-hydrogen-and-oxygen-evolution
#4
Shengsheng Cui, Manman Qian, Xiang Liu, Zijun Sun, Pingwu Du
Scalable and robust catalysts for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) are required for the implementation of water splitting technologies as a globally applicable method of producing renewable hydrogen. Herein, we report nitrogen-enriched porous carbon materials containing copper/copper oxide, derived from copper porphyrin-based conjugated mesoporous polymers (CMPs), as a bifunctional catalyst for both HER and OER. These catalysts have a high surface area, unique tubular structure, and strong synergistic effect of copper/copper oxide and porous carbons, resulting in excellent performance for water splitting...
September 8, 2016: ChemSusChem
https://www.readbyqxmd.com/read/27020763/in-situ-generated-highly-active-copper-oxide-catalysts-for-the-oxygen-evolution-reaction-at-low-overpotential-in-alkaline-solutions
#5
Xiang Liu, Shengsheng Cui, Manman Qian, Zijun Sun, Pingwu Du
Developing efficient water oxidation catalysts made up of earth-abundant elements has attracted much attention as a step toward for future clean energy production. Herein we report a simple one-step method to generate a low cost copper oxide catalyst film in situ from a copper(ii) ethylenediamine complex. The resulting catalyst has excellent activity toward the oxygen evolution reaction in alkaline solutions. A catalytic current density of 1.0 mA cm(-2) and 10 mA cm(-2) for the catalyst film requires the overpotentials of only ∼370 mV and ∼475 mV in 1...
April 25, 2016: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/26912373/copper-ii-tungstate-nanoflake-array-films-sacrificial-template-synthesis-hydrogen-treatment-and-their-application-as-photoanodes-in-solar-water-splitting
#6
Dianyi Hu, Peng Diao, Di Xu, Mengyang Xia, Yue Gu, Qingyong Wu, Chao Li, Shubin Yang
We report the preparation of CuWO4 nanoflake (NF) array films by using a solid phase reaction method in which WO3 NFs were employed as sacrificial templates. The SEM, TEM and XRD results demonstrated that the obtained CuWO4 films possessed a network structure that was composed of single crystalline NFs intersected with each other. The CuWO4 NF films showed superior photoelectrochemical (PEC) activity to other CuWO4 photoanodes reported recently for the oxygen evolution reaction (OER). We attributed the high activity to the unique morphological and crystalline structure of the CuWO4 film, which enhanced the photoactivity by providing a large specific area, a short hole transport distance from the inside of CuWO4 to the CuWO4/solution interface, and a low grain boundary density...
March 21, 2016: Nanoscale
https://www.readbyqxmd.com/read/26709945/insight-into-the-catalytic-mechanism-of-bimetallic-platinum-copper-core-shell-nanostructures-for-nonaqueous-oxygen-evolution-reactions
#7
Lu Ma, Xiangyi Luo, A Jeremy Kropf, Jianguo Wen, Xiaoping Wang, Sungsik Lee, Deborah J Myers, Dean Miller, Tianpin Wu, Jun Lu, Khalil Amine
The oxygen evolution reaction (OER) plays a critical role in multiple energy conversion and storage applications. However, its sluggish kinetics usually results in large voltage polarization and unnecessary energy loss. Therefore, designing efficient catalysts that could facilitate this process has become an emerging topic. Here, we present a unique Pt-Cu core-shell nanostructure for catalyzing the nonaqueous OER. The catalysts were systematically investigated with comprehensive spectroscopic techniques, and applied in nonaqueous Li-O2 electrochemical cells, which exhibited dramatically reduced charging overpotential (<0...
January 13, 2016: Nano Letters
https://www.readbyqxmd.com/read/26181359/in-situ-generation-of-oxide-nanowire-arrays-from-agcuzn-alloy-sulfide-with-enhanced-electrochemical-oxygen-evolving-performance
#8
Minghao Xie, Shiqi Ai, Jian Yang, Yudi Yang, Yihan Chen, Yong Jin
In this study, AgCuZn sulfide is fabricated on the surface of AgCuZn alloys by hydrothermal sulfuration. This ternary metal sulfide is equipped with enhanced activity toward oxygen evolution reaction (OER) in an alkaline electrolyte. Through comparison of the alloys with diverse compositions, we find out the best electrochemical property of a particular alloy sulfide forming on a AgCuZn substrate (Ag:Cu:Zn=43:49:8). The alloy sulfide exhibits an onset overpotential (η) of 0.27 V with a Tafel slope of 95±2 mV dec(-1) and a current density of 130 mA cm(-2) at η of 0...
August 12, 2015: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/24623197/copper-iron-molybdenum-mixed-oxides-as-efficient-oxygen-evolution-electrocatalysts
#9
Venkata Kali Vara Prasad Srirapu, Chandra Shekhar Sharma, Rahul Awasthi, Ravindra Nath Singh, Akhoury Sudhir Kumar Sinha
Ternary Cu, Fe and Mo mixed oxides having a nominal compositional formula, CuxFe2-x(MoO4)3 (0 ≤ x ≤ 1.5), have been prepared by a co-precipitation method at pH ≈ 2 and characterized by FT-IR, XRD, XPS, TEM and anodic polarization techniques for use as electrocatalysts for the oxygen evolution reaction (OER) in alkaline solutions. The crystallites of oxides with x ≤ 1 have the monoclinic crystal structure. The OER study shows that replacement of Fe in the Fe2(MoO4)3 matrix by 0.25-1.0 mol Cu increases the apparent electrocatalytic activity...
April 28, 2014: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/24457619/aqueous-asymmetric-cyclopropanation-reactions-in-polymersome-membranes
#10
Matthijs C M van Oers, Loai K E A Abdelmohsen, Floris P J T Rutjes, Jan C M van Hest
Copper-bis(oxazoline) complexes have been immobilised in the hydrophobic domain of a polymersome membrane to perform asymmetric cyclopropanation reactions in aqueous media with enhanced conversions and enantioselectivities.
April 21, 2014: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/20199214/characteristic-8-kev-x-rays-possess-radiobiological-properties-of-higher-let-radiation
#11
Ravi Shridhar, William Estabrook, Mark Yudelev, Joseph Rakowski, Jay Burmeister, George D Wilson, Michael C Joiner
Electronic brachytherapy systems are being developed that can deliver X rays of varying energy depending on the material of a secondary target. A copper target produces characteristic 8 keV X rays. Our aim was to determine whether 8 keV X rays might deliver greater biological effectiveness than megavoltage photons. Cells of the U251 human glioma cell line were used to compare the biological effects of 8 keV X rays and (60)Co gamma rays in terms of relative biological effectiveness (RBE), oxygen enhancement ratio (OER), and DNA damage...
March 2010: Radiation Research
https://www.readbyqxmd.com/read/10965264/lymphoma-in-the-ear
#12
REVIEW
P Merkus, M P Copper, M H Van Oers, P F Schouwenburg
BACKGROUND: Malignant tumors of the ear are rare. The most common malignant tumors are squamous cell carcinomas and adenocarcinomas. Lymphoma in the ear is rare. METHODS: We report 2 cases of a primary presentation of a lymphoma of the ear. The literature since 1947 is reviewed. RESULTS: An 83-year-old woman with an anaplastic large cell lymphoma of the skin of the external auditory meatus and a 75-year-old man with a B-cell non-Hodgkin's lymphoma of the mastoid process are presented...
September 2000: ORL; Journal for Oto-rhino-laryngology and its related Specialties
https://www.readbyqxmd.com/read/8949747/comparative-study-of-dna-radiolysis-by-fast-neutrons-and-gamma-rays
#13
COMPARATIVE STUDY
M Spotheim-Maurizot, C Savoye, R Sabattier, M Charlier
The effect of fast neutrons on cells is different from that of gamma-rays: the relative (to gamma) biological effect (RBE) is higher than one and the oxygen enhancement ratio (OER) is lower than that of gamma-rays. We searched for differences between the effects of the two radiations on DNA, the critical target of radiations. Using a model plasmid DNA we observed that for the same absorbed dose, fast neutrons induce twice fewer single strand breaks (SSB) and 1.5 more double strand breaks (DSB) than gamma-rays...
1996: Bulletin du Cancer. Radiothérapie: Journal de la Société Française du Cancer
https://www.readbyqxmd.com/read/3588845/radiobiology-of-ultrasoft-x-rays-i-cultured-hamster-cells-v79
#14
COMPARATIVE STUDY
M R Raju, S G Carpenter, J J Chmielewski, M E Schillaci, M E Wilder, J P Freyer, N F Johnson, P L Schor, R J Sebring, D T Goodhead
Ultrasoft X rays (approximately less than keV) provide a useful probe for the study of the physical parameters associated with the induction of biological lesions because the spatial scale of their energy depositions is of nanometer dimensions, comparable to that of critical structures within the cell. We report on cell-killing experiments using cultured hamster cells (V79) exposed to carbon K (0.28 keV), aluminum K (1.5 keV), copper K (8.0 keV), and 250 kVp X rays, under oxic and hypoxic conditions, and as a function of cell-cycle phase...
June 1987: Radiation Research
https://www.readbyqxmd.com/read/3477284/dna-quaternary-structure-in-the-radiation-sensitivity-of-human-lymphocytes-a-proposed-role-of-copper
#15
A M George, S A Sabovljev, L E Hart, W A Cramp, G Harris, S Hornsey
On challenging with 2M NaCl, the nuclei of human lymphocytes yield an aggregate of DNA-protein material. The density of the material is less when isolated from irradiated cells than when isolated from unirradiated cells. The density of this material, designated histone-free-DNA (HF-DNA), from irradiated cells returns to that from unirradiated cells if the irradiated cells are allowed time at 37 degrees C in nutrient conditions. Lymphocyte HF-DNA from patients who have exhibited hypersensitivity to radiotherapy exhibit slower repair characteristics than lymphocyte HF-DNA from the average normal subjects...
June 1987: British Journal of Cancer. Supplement
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