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https://www.readbyqxmd.com/read/29870585/assembling-ultrasmall-copper-doped-ruthenium-oxide-nanocrystals-into-hollow-porous-polyhedra-highly-robust-electrocatalysts-for-oxygen-evolution-in-acidic-media
#1
Jianwei Su, Ruixiang Ge, Kemin Jiang, Yan Dong, Fei Hao, Ziqi Tian, Guoxin Chen, Liang Chen
Here, a facile and novel strategy for the preparation of Cu-doped RuO2 hollow porous polyhedra composed of ultrasmall nanocrystals through one-step annealing of a Ru-exchanged Cu-BTC derivative is reported. Owing to the optimized surface configuration and altered electronic structure, the prepared catalyst displays a remarkable oxygen evolution reaction (OER) performance with low overpotential of 188 mV at 10 mA cm-2 in acidic electrolyte, an ultralow Tafel slope of 43.96 mV dec-1 , and excellent stability in durability testing for 10 000 cycles, and continuous testing of 8 h at a current density of 10 mA cm-2 ...
June 5, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29457161/a-self-supported-amorphous-ni-p-alloy-on-a-cuo-nanowire-array-an-efficient-3d-electrode-catalyst-for-water-splitting-in-alkaline-media
#2
Bing Chang, Shuai Hao, Zhixiang Ye, Yingchun Yang
Energy-efficient electrochemical water splitting is one important way to produce hydrogen fuel but still faces many challenges. In this communication, we report that an amorphous Ni-P alloy shell electrodeposited on a CuO nanowire array supported on copper foam (CuO@Ni-P NA/CF) can be used for efficient water splitting in alkaline media. As a 3D catalytic electrode, it exhibits excellent activity both for the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER) with overpotentials of 106 mV for HER and 275 mV for OER to achieve a current density of 30 mA cm-2 in 1...
March 1, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29367976/hierarchically-structured-multi-shell-nanotube-arrays-by-self-assembly-for-efficient-water-oxidation
#3
Steffen Czioska, Jianying Wang, Xue Teng, Shangshang Zuo, Songhai Xie, Zuofeng Chen
Photosynthesis in plants occurs at structures which form by self-assembly under ambient conditions, while catalysts used for artificial photosynthesis normally need special conditions like high pressure or temperature. Herein, a facile and cost effective way for the synthesis of a highly complex and efficient oxygen evolution reaction (OER) catalyst, formed solely by self-assembly in solution, is presented. Without the need for any instrumentation except for a glass beaker, highly active nickel-iron-copper multi-shell nanotube arrays are produced by immersion of a copper plate in three different solutions...
January 25, 2018: Nanoscale
https://www.readbyqxmd.com/read/29251309/in-situ-electrochemical-development-of-copper-oxide-nanocatalysts-within-a-tcnq-nanowire-array-a-highly-conductive-electrocatalyst-for-the-oxygen-evolution-reaction
#4
Xiang Ren, Xuqiang Ji, Yicheng Wei, Dan Wu, Yong Zhang, Min Ma, Zhiang Liu, Abdullah M Asiri, Qin Wei, Xuping Sun
It is highly desired to develop efficient earth-abundant electrocatalysts for the oxygen evolution reaction (OER) in alkaline media. In this communication, we report the in situ electrochemical conversion of a nanoarray of Cu(tetracyanoquinodimethane), Cu(TCNQ), an inorganic-organic hybrid, on Cu foam into CuO nanocrystals confined in a highly conductive nanoarray via anode oxidation. As a 3D catalyst electrode, the resulting CuO-TCNQ/CF shows high OER activity and demands an overpotential of only 317 mV to drive a geometrical catalytic current density of 25 mA cm-2 ...
February 6, 2018: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/29134993/the-promoting-effect-of-tetravalent-cerium-on-the-oxygen-evolution-activity-of-copper-oxide-catalysts
#5
Zhu Chen, Coleman X Kronawitter, Xiaofang Yang, Yao-Wen Yeh, Nan Yao, Bruce E Koel
A new catalyst is presented for the oxygen evolution reaction (OER) based on cerium-modified copper oxide (CuOx ) prepared using a facile electrodeposition procedure. Incorporation of Ce into CuOx leads to greatly improved OER activity, which reached an optimal value at a surface concentration of 6.9 at% Ce. Specifically, the OER current density at 400 mV overpotential for the most active Ce-modified CuOx catalyst (6.9 at% Ce) was 3.3 times greater compared to the pure CuOx . Coincident with the improved OER activity, Ce incorporation also leads to significant structural changes that manifested in increasing degrees of disorder...
December 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28671221/a-new-preparation-of-a-bifunctional-crystalline-heterogeneous-copper-electrocatalyst-by-electrodeposition-using-a-robson-type-macrocyclic-dinuclear-copper-complex-for-efficient-hydrogen-and-oxygen-evolution-from-water
#6
Samit Majumder, Ashraf Abdel Haleem, Perumandla Nagaraju, Yoshinori Naruta
The development of low-cost, stable bifunctional electrocatalysts, which operate in the same electrolyte with a low overpotential for water splitting, including the oxygen evolution reaction and the hydrogen evolution reaction, remains an attractive prospect and a great challenge. In this study, a water soluble Robson-type macrocyclic dicopper(ii) complex has been used for the first time as a catalyst precursor for the generation of a copper-based bifunctional heterogeneous catalyst film, which can be used for both HER and OER at a near neutral pH...
July 18, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/28598596/interconnected-copper-cobaltite-nanochains-as-efficient-electrocatalysts-for-water-oxidation-in-alkaline-medium
#7
Ayon Karmakar, Suneel Kumar Srivastava
The present work is focused on the protective-agent-free synthesis of interconnected copper cobaltite (Cu0.3Co2.7O4) nanochains by temperature-controlled solvothermal method followed by post-thermal treatment of the precursors. Furthermore, Cu0.3Co2.7O4 interconnected nanochains are employed as electrocatalyst for water oxidation in alkaline medium for the first time. Extensive studies of physiochemical properties showed the formation of interconnected 1D nanochains of Cu0.3Co2.7O4 exhibiting a larger specific surface area (139...
July 12, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28374445/a-dendritic-nanostructured-copper-oxide-electrocatalyst-for-the-oxygen-evolution-reaction
#8
Tran Ngoc Huan, Gwenaëlle Rousse, Sandrine Zanna, Ivan T Lucas, Xiangzhen Xu, Nicolas Menguy, Victor Mougel, Marc Fontecave
To use water as the source of electrons for proton or CO2 reduction within electrocatalytic devices, catalysts are required for facilitating the proton-coupled multi-electron oxygen evolution reaction (OER, 2 H2 O→O2 +4 H(+) +4 e(-) ). These catalysts, ideally based on cheap and earth abundant metals, have to display high activity at low overpotential and good stability and selectivity. While numerous examples of Co, Mn, and Ni catalysts were recently reported for water oxidation, only few examples were reported using copper, despite promising efficiencies...
April 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28191583/a-hierarchically-porous-nickel-copper-phosphide-nano-foam-for-efficient-electrochemical-splitting-of-water
#9
Li Wei, Kunli Goh, Özgür Birer, H Enis Karahan, Jian Chang, Shengli Zhai, Xuncai Chen, Yuan Chen
Electrochemical splitting of water to produce oxygen (O2) and hydrogen (H2) through a cathodic hydrogen evolution reaction (HER) and an anodic oxygen evolution reaction (OER) is a promising green approach for sustainable energy supply. Here we demonstrated a porous nickel-copper phosphide (NiCuP) nano-foam as a bifunctional electrocatalyst for highly efficient total water splitting. Prepared from a bubble-templated electrodeposition method and subsequent low-temperature phosphidization, NiCuP has a hierarchical pore structure with a large electrochemical active surface area...
February 13, 2017: Nanoscale
https://www.readbyqxmd.com/read/28008761/crystalline-copper-phosphide-nanosheets-as-an-efficient-janus-catalyst-for-overall-water-splitting
#10
Ali Han, Hanyu Zhang, Ruihan Yuan, Hengxing Ji, Pingwu Du
Hydrogen is essential to many industrial processes and could play an important role as an ideal clean energy carrier for future energy supply. Herein, we report for the first time the growth of crystalline Cu3P phosphide nanosheets on conductive nickel foam (Cu3P@NF) for electrocatalytic and visible light-driven overall water splitting. Our results show that the Cu3P@NF electrode can be used as an efficient Janus catalyst for both the oxygen evolution reaction (OER) and the hydrogen evolution reaction (HER)...
January 9, 2017: ACS Applied Materials & Interfaces
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
#11
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 13, 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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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