N-Doped carbon nanofibers derived from bacterial cellulose as an excellent metal-free catalyst for selective oxidation of arylalkanes

2019 ◽  
Vol 55 (13) ◽  
pp. 1935-1938 ◽  
Author(s):  
Runkun Huang ◽  
Changyan Cao ◽  
Jian Liu ◽  
Dongping Sun ◽  
Weiguo Song
Keyword(s):  
Bacterial Cellulose ◽  
Carbon Nanofibers ◽  
Selective Oxidation ◽  
Low Cost ◽  
Metal Free ◽  
One Step

N-Doped carbon nanofibers derived from one-step pyrolysis of low-cost bacterial cellulose with the assistance of urea were an excellent metal-free carbocatalyst for selective oxidation of arylalkanes.

Biomass-derived three-dimensional honeycomb-like hierarchical structured carbon for ultrahigh energy density asymmetric supercapacitors

2016 ◽  
Vol 4 (35) ◽  
pp. 13589-13602 ◽  
Author(s):  
Dandan Shan ◽  
Jiao Yang ◽  
Wei Liu ◽  
Jun Yan ◽  
Zhuangjun Fan
Keyword(s):  
Energy Density ◽  
Bacterial Cellulose ◽  
Low Cost ◽  
Three Dimensional ◽  
Ultrahigh Energy ◽  
Asymmetric Supercapacitors ◽  
One Step

3D honeycomb-like hierarchical structured carbon (HSC) has been fabricated by one-step carbonization/activation of abundant and low cost bacterial cellulose for ultrahigh energy density supercapacitors.

Preparation of bacterial cellulose based nitrogen-doped carbon nanofibers and their applications in the oxygen reduction reaction and sodium–ion battery

2018 ◽  
Vol 42 (9) ◽  
pp. 7407-7415 ◽  
Author(s):  
Yang Huang ◽  
Liang Wang ◽  
Lei Lu ◽  
Mengmeng Fan ◽  
Fanshu Yuan ◽  
...  
Keyword(s):  
Oxygen Reduction Reaction ◽  
Bacterial Cellulose ◽  
Oxygen Reduction ◽  
Carbon Nanofibers ◽  
Low Cost ◽  
Reduction Reaction ◽  
Sodium Ion ◽  
Sodium Ion Battery ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

3D N-doped carbon nanofibers were fabricated from low-cost biomass bacterial cellulose and used as electrodes for both ORR and SIBs.

One-step synthesis of carbon nanosheet-decorated carbon nanofibers as a 3D interconnected porous carbon scaffold for lithium–sulfur batteries

2017 ◽  
Vol 5 (45) ◽  
pp. 23737-23743 ◽  
Author(s):  
Shuo Feng ◽  
Junhua Song ◽  
Shaofang Fu ◽  
Chengzhou Zhu ◽  
Qiurong Shi ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Carbon Nanofibers ◽  
Porous Carbon ◽  
Low Cost ◽  
Lithium Sulfur Batteries ◽  
One Step ◽  
Storage Methods ◽  
Lithium Sulfur

Among the emerging energy storage methods, lithium–sulfur (LIS) batteries have drawn plenty of attention due to their high theoretical energy density, low cost and environmental benignity.

Dual Nickel/Palladium-Catalyzed Reductive Cross-Coupling Reactions Between Two Phenol Derivatives

2020 ◽  
Author(s):  
Baojian Xiong ◽  
Yue Li ◽  
Yin Wei ◽  
Søren Kramer ◽  
Zhong Lian
Keyword(s):  
Functional Group ◽  
Low Cost ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Phenol Derivatives ◽  
Cross Coupling Reactions ◽  
Palladium Catalyzed ◽  
One Step ◽  
Aryl Tosylates ◽  
Low Sensitivity

Cross-coupling between substrates that can be easily derived from phenols is highly attractive due to the abundance and low cost of phenols. Here, we report a dual nickel/palladium-catalyzed reductive cross-coupling between aryl tosylates and aryl triflates; both substrates can be accessed in just one step from readily available phenols. The reaction has a broad functional group tolerance and substrate scope (>60 examples). Furthermore, it displays low sensitivity to steric effects demonstrated by the synthesis of a 2,2’disubstituted biaryl and a fully substituted aryl product. The widespread presence of phenols in natural products and pharmaceuticals allow for straightforward late-stage functionalization, illustrated with examples such as Ezetimibe and tyrosine. NMR spectroscopy and DFT calculations indicate that the nickel catalyst is responsible for activating the aryl triflate, while the palladium catalyst preferentially reacts with the aryl tosylate.

Selective Oxidation of Alcohols Catalyzed by a Transition Metal-Free System of NHPI/DDQ/NaNO2

2011 ◽  
Vol 32 (1) ◽  
pp. 118-122 ◽  
Author(s):  
Lipeng ZHOU ◽  
Chaofeng ZHANG ◽  
Tao FANG ◽  
Bingbing ZHANG ◽  
Ying WANG ◽  
...  
Keyword(s):  
Transition Metal ◽  
Selective Oxidation ◽  
Free System ◽  
Metal Free ◽  
Oxidation Of Alcohols

Surface Modification of Poly(Vinylchloride) for Manufacturing Advanced Catheters

2020 ◽  
Vol 27 (10) ◽  
pp. 1616-1633 ◽  
Author(s):  
Oana Cristina Duta ◽  
Aurel Mihail Ţîţu ◽  
Alexandru Marin ◽  
Anton Ficai ◽  
Denisa Ficai ◽  
...  
Keyword(s):  
Surface Modification ◽  
Chemical Modification ◽  
Medical Devices ◽  
Low Cost ◽  
Physical And Mechanical Properties ◽  
Polymeric Materials ◽  
Modern Medicine ◽  
Structural Failure ◽  
Chemical Grafting ◽  
One Step

Polymeric materials, due to their excellent physicochemical properties and versatility found applicability in multiples areas, including biomaterials used in tissue regeneration, prosthetics (hip, artificial valves), medical devices, controlled drug delivery systems, etc. Medical devices and their applications are very important in modern medicine and the need to develop new materials with improved properties or to improve the existent materials is increasing every day. Numerous reasearches are activated in this domain in order to obtain materials/surfaces that does not have drawbacks such as structural failure, calcifications, infections or thrombosis. One of the most used material is poly(vinylchloride) (PVC) due to its unique properties, availability and low cost. The most common method used for obtaining tubular devices that meet the requirements of medical use is the surface modification of polymers without changing their physical and mechanical properties, in bulk. PVC is a hydrophobic polymer and therefore many research studies were conducted in order to increase the hydrophilicity of the surface by chemical modification in order to improve biocompatibility, to enhance wettability, reduce friction or to make lubricious or antimicrobial coatings. Surface modification of PVC can be achieved by several strategies, in only one step or, in some cases, in two or more steps by applying several techniques consecutively to obtain the desired modification / performances. The most common processes used for modifying the surface of PVC devices are: plasma treatment, corona discharge, chemical grafting, electric discharge, vapour deposition of metals, flame treatment, direct chemical modification (oxidation, hydrolysis, etc.) or even some physical modification of the roughness of the surface.

scholarly journals Converting copper sulfide to copper with surface sulfur for electrocatalytic alkyne semi-hydrogenation with water

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yongmeng Wu ◽  
Cuibo Liu ◽  
Changhong Wang ◽  
Yifu Yu ◽  
Yanmei Shi ◽  
...  
Keyword(s):  
Binding Energy ◽  
Noble Metal ◽  
Atomic Hydrogen ◽  
Copper Sulfide ◽  
Low Cost ◽  
Water Electrolysis ◽  
Metal Free ◽  
Copper Nanowire

AbstractElectrocatalytic alkyne semi-hydrogenation to alkenes with water as the hydrogen source using a low-cost noble-metal-free catalyst is highly desirable but challenging because of their over-hydrogenation to undesired alkanes. Here, we propose that an ideal catalyst should have the appropriate binding energy with active atomic hydrogen (H*) from water electrolysis and a weaker adsorption with an alkene, thus promoting alkyne semi-hydrogenation and avoiding over-hydrogenation. So, surface sulfur-doped and -adsorbed low-coordinated copper nanowire sponges are designedly synthesized via in situ electroreduction of copper sulfide and enable electrocatalytic alkyne semi-hydrogenation with over 99% selectivity using water as the hydrogen source, outperforming a copper counterpart without surface sulfur. Sulfur anion-hydrated cation (S2−-K+(H2O)n) networks between the surface adsorbed S2− and K+ in the KOH electrolyte boost the production of active H* from water electrolysis. And the trace doping of sulfur weakens the alkene adsorption, avoiding over-hydrogenation. Our catalyst also shows wide substrate scopes, up to 99% alkenes selectivity, good reducible groups compatibility, and easily synthesized deuterated alkenes, highlighting the promising potential of this method.

Noble-metal-free dye-sensitized selective oxidation of methane to methanol with green light (550 nm)

Nano Research ◽  
2021 ◽  
Author(s):  
Xingyang Wu ◽  
Yi Zeng ◽  
Hangchen Liu ◽  
Jiaqing Zhao ◽  
Tierui Zhang ◽  
...  
Keyword(s):  
Selective Oxidation ◽  
Noble Metal ◽  
Green Light ◽  
Metal Free ◽  
Dye Sensitized ◽  
Oxidation Of Methane
Sign in / Sign up

Export Citation Format

Share Document