Highly crystalline PtCu nanotubes with three dimensional molecular accessible and restructured surface for efficient catalysis

2017 ◽  
Vol 10 (8) ◽  
pp. 1751-1756 ◽  
Author(s):  
Hui-Hui Li ◽  
Qi-Qi Fu ◽  
Liang Xu ◽  
Si-Yue Ma ◽  
Ya-Rong Zheng ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Open Architecture ◽  
Potential Cycling ◽  
Initial Value ◽  
Durability Test ◽  
Single Crystalline ◽  
Highly Active ◽  
Simple Potential

We reveal a highly active and durable class of electrocatalysts with connected single-crystalline nanoparticles, forming an open architecture. The MOR activity could be recovered to the initial value or even betterviasimple potential cycling after durability test.

scholarly journals Fe Containing Templates Derived Atomic Fe-N-C to Boost Fenton-Like Reaction and the Charge Migration Analysis on Highly Active Fe-N4 Sites

2021 ◽  
Author(s):  
Yuan Gao ◽  
Xiaoguang Duan ◽  
Bin Li ◽  
Qianqian Jia ◽  
Yang Li ◽  
...  
Keyword(s):  
Water Pollution ◽  
Vapor Deposition ◽  
Advanced Oxidation Processes ◽  
Three Dimensional ◽  
Chemical Vapor ◽  
Charge Migration ◽  
Carbon Nanosheets ◽  
Oxidation Processes ◽  
Highly Active ◽  
Migration Analysis

Persulfate-based advanced oxidation processes are promising technologies to solve water pollution. In this work, single iron atoms are anchored in three-dimensional N-doped carbon nanosheets by a chemical vapor deposition (CVD)...

scholarly journals Sequential cocatalyst decoration on BaTaO2N towards highly-active Z-scheme water splitting

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Zheng Wang ◽  
Ying Luo ◽  
Takashi Hisatomi ◽  
Junie Jhon M. Vequizo ◽  
Sayaka Suzuki ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Water Splitting ◽  
Energy Conversion Efficiency ◽  
Hydrogen Energy ◽  
Apparent Quantum Yield ◽  
Intimate Contact ◽  
Single Crystalline ◽  
Highly Active ◽  
Uniform Dispersion ◽  
Solar Hydrogen Production

AbstractOxynitride photocatalysts hold promise for renewable solar hydrogen production via water splitting owing to their intense visible light absorption. Cocatalyst loading is essential for activation of such oxynitride photocatalysts. However, cocatalyst nanoparticles form aggregates and exhibit weak interaction with photocatalysts, which prevents eliciting their intrinsic photocatalytic performance. Here, we demonstrate efficient utilization of photoexcited electrons in a single-crystalline particulate BaTaO2N photocatalyst prepared with the assistance of RbCl flux for H2 evolution reactions via sequential decoration of Pt cocatalyst by impregnation-reduction followed by site-selective photodeposition. The Pt-loaded BaTaO2N photocatalyst evolves H2 over 100 times more efficiently than before, with an apparent quantum yield of 6.8% at the wavelength of 420 nm, from a methanol aqueous solution, and a solar-to-hydrogen energy conversion efficiency of 0.24% in Z-scheme water splitting. Enabling uniform dispersion and intimate contact of cocatalyst nanoparticles on single-crystalline narrow-bandgap particulate photocatalysts is a key to efficient solar-to-chemical energy conversion.

The influence of mean shear on Alfvén-internal wave propagation

1976 ◽  
Vol 15 (2) ◽  
pp. 197-222
Author(s):  
R. J. Hartman
Keyword(s):  
Three Dimensional ◽  
Dimensional System ◽  
Linear Wave ◽  
Mean Flow ◽  
Wave Processes ◽  
Initial Value ◽  
Initial Wave ◽  
Wave Phenomena ◽  
Three Dimensional System

This paper uses the general solution of the linearized initial-value problem for an unbounded, exponentially-stratified, perfectly-conducting Couette flow in the presence of a uniform magnetic field to study the development of localized wave-type perturbations to the basic flow. The two-dimensional problem is shown to be stable for all hydrodynamic Richardson numbers JH, positive and negative, and wave packets in this flow are shown to approach, asymptotically, a level in the fluid (the ‘isolation level’) which is a smooth, continuous, function of JH that is well defined for JH < 0 as well as JH > 0. This system exhibits a rich complement of wave phenomena and a variety of mechanisms for the transport of mean flow kinetic and potential energy, via linear wave processes, between widely-separated regions of fluid; this in addition to the usual mechanisms for the absorption of the initial wave energy itself. The appropriate three-dimensional system is discussed, and the role of nonlinearities on the development of localized disturbances is considered.

scholarly journals WS(1−x)Sex Nanoparticles Decorated Three-Dimensional Graphene on Nickel Foam: A Robust and Highly Efficient Electrocatalyst for the Hydrogen Evolution Reaction

Nanomaterials ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 929 ◽  
Author(s):  
Sajjad Hussain ◽  
Kamran Akbar ◽  
Dhanasekaran Vikraman ◽  
Rana Afzal ◽  
Wooseok Song ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Hydrogen Evolution Reaction ◽  
Large Scale ◽  
Nickel Foam ◽  
Transition Metal Dichalcogenides ◽  
Three Dimensional ◽  
Cost Effective ◽  
Highly Efficient ◽  
Highly Active ◽  
Earth Abundant

To find an effective alternative to scarce, high-cost noble platinum (Pt) electrocatalyst for hydrogen evolution reaction (HER), researchers are pursuing inexpensive and highly efficient materials as an electrocatalyst for large scale practical application. Layered transition metal dichalcogenides (TMDCs) are promising candidates for durable HER catalysts due to their cost-effective, highly active edges and Earth-abundant elements to replace Pt electrocatalysts. Herein, we design an active, stable earth-abundant TMDCs based catalyst, WS(1−x)Sex nanoparticles-decorated onto a 3D porous graphene/Ni foam. The WS(1−x)Sex/graphene/NF catalyst exhibits fast hydrogen evolution kinetics with a moderate overpotential of ~−93 mV to drive a current density of 10 mA cm−2, a small Tafel slope of ~51 mV dec−1, and a long cycling lifespan more than 20 h in 0.5 M sulfuric acid, which is much better than WS2/NF and WS2/graphene/NF catalysts. Our outcomes enabled a way to utilize the TMDCs decorated graphene and precious-metal-free electrocatalyst as mechanically robust and electrically conductive catalyst materials.

scholarly journals Newly developed dual topoisomerase inhibitor P8-D6 is highly active in ovarian cancer

2021 ◽  
Vol 13 ◽  
pp. 175883592110598
Author(s):  
Inken Flörkemeier ◽  
Tamara N. Steinhauer ◽  
Nina Hedemann ◽  
Magnus Ölander ◽  
Per Artursson ◽  
...  
Keyword(s):  
Ovarian Cancer ◽  
Topoisomerase I ◽  
Ex Vivo ◽  
Chemotherapy Resistance ◽  
Membrane Integrity ◽  
Three Dimensional ◽  
New Drugs ◽  
Highly Active ◽  
Gynaecologic Neoplasms

Background: Ovarian cancer (OvCa) constitutes a rare and highly aggressive malignancy and is one of the most lethal of all gynaecologic neoplasms. Due to chemotherapy resistance and treatment limitations because of side effects, OvCa is still not sufficiently treatable. Hence, new drugs for OvCa therapy such as P8-D6 with promising antitumour properties have a high clinical need. The benzo[ c]phenanthridine P8-D6 is an effective inductor of apoptosis by acting as a dual topoisomerase I/II inhibitor. Methods: In the present study, the effectiveness of P8-D6 on OvCa was investigated in vitro. In various OvCa cell lines and ex vivo primary cells, the apoptosis induction compared with standard therapeutic agents was determined in two-dimensional monolayers. Expanded by three-dimensional and co-culture, the P8-D6 treated cells were examined for changes in cytotoxicity, apoptosis rate and membrane integrity via scanning electron microscopy (SEM). Likewise, the effects of P8-D6 on non-cancer human ovarian surface epithelial cells and primary human hepatocytes were determined. Results: This study shows a significant P8-D6-induced increase in apoptosis and cytotoxicity in OvCa cells which surpasses the efficacy of well-established drugs like cisplatin or the topoisomerase inhibitors etoposide and topotecan. Non-cancer cells were affected only slightly by P8-D6. Moreover, no hepatotoxic effect in in vitro studies was detected. Conclusion: P8-D6 is a strong and rapid inductor of apoptosis and might be a novel treatment option for OvCa therapy.

Self-Supported Single Crystalline H2Ti8O17 Nanoarrays as Integrated Three-Dimensional Anodes for Lithium-Ion Microbatteries

2013 ◽  
Vol 6 (1) ◽  
pp. 568-574 ◽  
Author(s):  
Jin-Yun Liao ◽  
Xingcheng Xiao ◽  
Drew Higgins ◽  
Gregory Lui ◽  
Zhongwei Chen
Keyword(s):  
Three Dimensional ◽  
Lithium Ion ◽  
Single Crystalline
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