Fabrication of a mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ perovskite as a low-cost and efficient catalyst for oxygen reduction

2017 ◽  
Vol 46 (40) ◽  
pp. 13903-13911 ◽  
Author(s):  
Xiangzhi Cui ◽  
Ryan O'Hayre ◽  
Svitlana Pylypenko ◽  
Linlin Zhang ◽  
Liming Zeng ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Precious Metal ◽  
Oxygen Vacancies ◽  
Low Cost ◽  
Cathode Catalyst ◽  
Methanol Tolerance ◽  
Efficient Catalyst ◽  
Metal Free ◽  
Redox Couples ◽  
Catalytic Stability

The redox couples Co4+/Co3+ and Fe3+/Fe2+, and oxygen vacancies in mesoporous Ba0.5Sr0.5Co0.8Fe0.2O3−δ endow the precious metal-free cathode catalyst with high ORR catalytic activity, and more importantly excellent methanol tolerance and electro-catalytic stability.

Nano-structured hybrid molybdenum carbides/nitrides generated in situ for HER applications

2017 ◽  
Vol 5 (17) ◽  
pp. 7764-7768 ◽  
Author(s):  
Rajinder Kumar ◽  
Ritu Rai ◽  
Seema Gautam ◽  
Abir De Sarkar ◽  
Nidhi Tiwari ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Precious Metal ◽  
Molybdenum Carbide ◽  
Low Cost ◽  
Metal Free ◽  
Highly Efficient ◽  
Molybdenum Carbides ◽  
Supported Molybdenum Carbide

A highly efficient, low-cost (precious-metal-free), highly stable nanohybrid electrocatalyst containing carbon-supported molybdenum carbide and nitride nanoparticles of size ranging from 8 to 12 nm exhibit excellent HER catalytic activity.

SnO2 nanocrystal-decorated mesoporous ZSM-5 as a precious metal-free electrode catalyst for methanol oxidation

2015 ◽  
Vol 8 (4) ◽  
pp. 1261-1266 ◽  
Author(s):  
Xiangzhi Cui ◽  
Yan Zhu ◽  
Zile Hua ◽  
Jingwei Feng ◽  
Ziwei Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Precious Metal ◽  
Metal Free ◽  
Catalytic Effects

The synergetic catalytic effects between the mesoporous ZSM-5 matrix and the loaded SnO2 nanocrystals endow the precious metal-free electrode catalyst SnO2/m-ZSM-5 nanocomposite with high and stable catalytic activity for methanol oxidation.

Ethanol tolerant precious metal free cathode catalyst for alkaline direct ethanol fuel cells

2017 ◽  
Vol 228 ◽  
pp. 325-331 ◽  
Author(s):  
Ilena Grimmer ◽  
Paul Zorn ◽  
Stephan Weinberger ◽  
Christoph Grimmer ◽  
Birgit Pichler ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Precious Metal ◽  
Cathode Catalyst ◽  
Ethanol Fuel ◽  
Direct Ethanol Fuel Cells ◽  
Metal Free

scholarly journals Carbon Microsphere-Supported Metallic Nickel Nanoparticles as Novel Heterogeneous Catalysts and Their Application for the Reduction of Nitrophenol

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5680
Author(s):  
Melinda Krebsz ◽  
László Kótai ◽  
István E. Sajó ◽  
Tamás Váczi ◽  
Tibor Pasinszki
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysts ◽  
Nickel Nanoparticles ◽  
Low Cost ◽  
Cation Exchange Resin ◽  
Metallic Nickel ◽  
Efficient Catalyst ◽  
Nickel Ions ◽  
Carbon Microsphere ◽  
Bet Analysis

Nickel nanoparticles are gaining increasing attention in catalysis due to their versatile catalytic action. A novel, low-cost and facile method was developed in this work to synthesize carbon microsphere-supported metallic nickel nanoparticles (Ni-NP/C) for heterogeneous catalysis. The synthesis was based on carbonizing a polystyrene-based cation exchange resin loaded with nickel ions at temperatures between 500 and 1000 °C. The decomposition of the nickel-organic framework resulted in both Ni-NP and carbon microsphere formation. The phase composition, morphology and surface area of these Ni-NP/C microspheres were characterized by powder X-ray diffraction, Raman spectroscopy, scanning electron microscopy and BET analysis. Elemental nickel was found to be the only metal containing phase; fcc-Ni coexisted with hcp-Ni at carbonization temperatures between 500 and 700 °C, and fcc-Ni was the only metallic phase at 800–1000 °C. Graphitization and carbon nanotube formation were observed at high temperatures. The catalytic activity of Ni-NP/C was tested in the reduction of 4-nitrophenol to 4-aminophenol by sodium borohydride, and Ni-NP/C was proved to be an efficient catalyst in this reaction. The relatively easy and scalable synthetic method, as well as the easy separation and catalytic activity of Ni-NP/C, provide a viable alternative to existing nickel nanocatalysts in future applications.

scholarly journals Increasing Silicon Concentration and Doping Heteroatom to Successfully Realize High HER Catalytic Activity in 2D Metal-Free BSin (n = 1-4) Structures: A First-Principles Study

2021 ◽  
Author(s):  
Cuimei Li ◽  
Guangtao Yu ◽  
Ying Li ◽  
wei Chen
Keyword(s):  
Catalytic Activity ◽  
First Principles ◽  
Active Sites ◽  
Low Cost ◽  
Atomic Ratio ◽  
Two Dimensional ◽  
Metal Free ◽  
Catalytic Activities ◽  
High Efficient ◽  
New Strategies

Abstract Under the DFT calculations, the graphene-like two-dimensional (2D) BSin (n = 1-4) nanostructures are stable in terms of energy, kinetics and thermal aspects, and can possess metallic conductivity, which are advantageous to their catalytic activities for hydrogen evolution reaction (HER). Our computed results reveal that they can uniformly exhibit high HER catalytic activity. With increasing the Si/B atomic ratio, higher HER activity can be achieved, due to the change from weak aromaticity to strong anti-aromaticity for the correlative BxSiy six-membered rings. Moreover, by doping P, S, Ge and C atoms with the different electronegativity, the HER activity of the studied systems can be further improved because the electron transfer induced by these dopants can effectively activates the relevant B and Si atoms. In addition, in view of more active sites, increasing the Si concentration can also generally increase the HER activity of doped systems. For all BSin systems studied, the Si-Si bridge sites or Si-sites can uniformly serve as the most active sites. This study not only represents the first application of 2D metal-free BSin in HER catalysis, but also provides new strategies for designing high-efficient and low-cost HER electrocatalysts based on Si/B or even other Si-containing materials.

scholarly journals Composite of bentonite and cyclodextrin as an efficient catalyst for promoting chemical transformations in aqueous media

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fatemeh Koohestani ◽  
Samahe Sadjadi ◽  
Majid Heravi
Keyword(s):  
Catalytic Activity ◽  
Knoevenagel Condensation ◽  
Aqueous Media ◽  
Bentonite Clay ◽  
Chemical Transformations ◽  
Elemental Mapping ◽  
Efficient Catalyst ◽  
Metal Free ◽  
Excellent Activity ◽  
Mapping Analysis

AbstractCombining the encapsulating capability of cyclodextrin and instinctive features of bentonite clay, a versatile metal free catalyst has been developed that could promote various chemical reactions such as Knoevenagel condensation, synthesis of xanthan and octahydroquinazolinones in aqueous media under ultrasonic irradiation. To prepare the catalyst, bentonite was Cl-functionalized and then reacted with isatin and guanidine successively to furnish amino functionalized bentonite. The latter then reacted with tosylated cyclodextrin. The resultant catalytic composite was characterized via XRD, SEM, EDS, BET, elemental mapping analysis, TGA and FTIR. The catalytic activity tests approved excellent activity of the catalyst as well as broad substrate scope. Notably, the catalyst could be simply recovered and reused for several reaction runs. Moreover, the activity of the composite was superior to that of its components.

An iron porphyrin-based conjugated network wrapped around carbon nanotubes as a noble-metal-free electrocatalyst for efficient oxygen reduction reaction

2016 ◽  
Vol 3 (6) ◽  
pp. 821-827 ◽  
Author(s):  
Hongxing Jia ◽  
Zijun Sun ◽  
Daochuan Jiang ◽  
Shangfeng Yang ◽  
Pingwu Du
Keyword(s):  
Carbon Nanotubes ◽  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Robust Stability ◽  
Reduction Reaction ◽  
Iron Porphyrin ◽  
High Catalytic Activity ◽  
Excellent Performance ◽  
Methanol Tolerance ◽  
Metal Free

This study reported the first system of Fe-porphyrin conjugated network on carbon nanotubes for ORR, which exhibited excellent performance with high catalytic activity, robust stability, and good methanol tolerance.

scholarly journals Highly stable precious metal-free cathode catalyst for fuel cell application

2016 ◽  
Vol 327 ◽  
pp. 557-564 ◽  
Author(s):  
Alexey Serov ◽  
Michael J. Workman ◽  
Kateryna Artyushkova ◽  
Plamen Atanassov ◽  
Geoffrey McCool ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Precious Metal ◽  
Cathode Catalyst ◽  
Metal Free ◽  
Fuel Cell Application

Few-layered graphene-supported palladium as a highly efficient catalyst in oxygen reduction reaction

2014 ◽  
Vol 50 (92) ◽  
pp. 14433-14435 ◽  
Author(s):  
L. Truong-Phuoc ◽  
C. Pham-Huu ◽  
V. Da Costa ◽  
I. Janowska
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Alkaline Solution ◽  
State Of The Art ◽  
Low Cost ◽  
Reduction Reaction ◽  
Efficient Catalyst ◽  
Order Of Magnitude ◽  
Supported Palladium

Prepared by a scalable, low-cost and eco-friendly method, Pd/FLG shows improved ORR performance in alkaline solution with durability and catalytic activity an order of magnitude higher than the state-of the-art Pt/C catalyst.

A soil/Vulcan XC-72 hybrid as a highly-effective catalytic cathode for rechargeable Li–O2batteries

2015 ◽  
Vol 2 (11) ◽  
pp. 1006-1010 ◽  
Author(s):  
Xiaofei Hu ◽  
Xiaorui Fu ◽  
Jun Chen
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Void Volume ◽  
Cathode Catalyst ◽  
Hybrid Catalyst ◽  
Soil C ◽  
Metal Free ◽  
Volume Expander ◽  
Lithium Oxygen Batteries ◽  
First Time

We report for the first time a hybrid of soil and commercial Vulcan XC-72 carbon (labeled as soil/C) as a high-performance cathode catalyst for rechargeable lithium–oxygen batteries. It was found that soil as a low cost and metal-free void volume expander in the hybrid catalyst is promising in the application of rechargeable Li–O2batteries.

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