Molten salts-assisted synthesis of special open-cell Fe, N co-doped porous carbon as an efficient electrocatalyst for zinc-air batteries

2021 ◽  
Author(s):  
Xiaoying Gao ◽  
Xuan Xie ◽  
Kanjun Sun ◽  
Xiaofei Lei ◽  
Tianyu Hou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Molten Salts ◽  
Low Cost ◽  
High Catalytic Activity ◽  
Open Cell ◽  
Co Doped ◽  
Excellent Stability ◽  
Zinc Air Batteries

Fe, N co-doped carbon electrocatalyst is one of the most attractive alternatives to Pt/C catalysts due to its high catalytic activity, excellent stability and low cost. However, obtaining stable and...

scholarly journals High catalytic activity for formaldehyde oxidation of an interconnected network structure composed of δ-MnO2 nanosheets and γ-MnOOH nanowires

2020 ◽  
Vol 8 (4) ◽  
pp. 429-439
Author(s):  
Ying Tao ◽  
Rong Li ◽  
Ai-Bin Huang ◽  
Yi-Ning Ma ◽  
Shi-Dong Ji ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Network Structure ◽  
Manganese Oxides ◽  
Active Oxygen Species ◽  
Low Cost ◽  
High Dispersion ◽  
Hydroxyl Groups ◽  
High Catalytic Activity ◽  
Interconnected Network ◽  
Surface Hydroxyl

AbstractAmong the transition metal oxide catalysts, manganese oxides have great potential for formaldehyde (HCHO) oxidation at ambient temperature because of their high activity, nontoxicity, low cost, and polybasic morphologies. In this work, a MnO2-based catalyst (M-MnO2) with an interconnected network structure was successfully synthesized by a one-step hydrothermal method. The M-MnO2 catalyst was composed of the main catalytic agent, δ-MnO2 nanosheets, dispersed in a nonactive framework material of γ-MnOOH nanowires. The catalytic activity of M-MnO2 for HCHO oxidation at room temperature was much higher than that of the pure δ-MnO2 nanosheets. This is attributed to the special interconnected network structure. The special interconnected network structure has high dispersion and specific surface area, which can provide more surface active oxygen species and higher surface hydroxyl groups to realize rapid decomposition of HCHO.

From Ru nanoparticle-encapsulated metal–organic frameworks to highly catalytically active Cu/Ru nanoparticle-embedded porous carbon

2017 ◽  
Vol 5 (10) ◽  
pp. 4835-4841 ◽  
Author(s):  
Pradip Pachfule ◽  
Xinchun Yang ◽  
Qi-Long Zhu ◽  
Nobuko Tsumori ◽  
Takeyuki Uchida ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Porous Carbon ◽  
Metal Organic Frameworks ◽  
Ammonia Borane ◽  
Carbon Composites ◽  
High Catalytic Activity ◽  
Catalytically Active ◽  
Metal Organic

High-temperature pyrolysis of Ru nanoparticle-encapsulated MOF (Ru@HKUST-1) afforded ultrafine Cu/Ru nanoparticle-embedded porous carbon composites (Cu/Ru@C), which show high catalytic activity for ammonia borane hydrolysis.

Towards highly active heterogeneous catalysts via a sequential noncovalent bonding strategy

2021 ◽  
Author(s):  
Ruixue Wang ◽  
Ying Yue ◽  
Huiying Wei ◽  
Jinxin Guo ◽  
Yanzhao Yang
Keyword(s):  
Catalytic Activity ◽  
Heterogeneous Catalysts ◽  
High Catalytic Activity ◽  
Synthetic Route ◽  
Surface Ligands ◽  
Highly Active ◽  
Noncovalent Bonding ◽  
Excellent Stability

Here, a novel synthetic route of ceria-based nanocatalysts with high catalytic activity and excellent stability was constructed by utilizing function groups from surface ligands. The surface of ceria nanorods were...

scholarly journals Improving the Performance of Zn-Air Batteries with N-Doped Electroexfoliated Graphene

Materials ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2115 ◽  
Author(s):  
Anna Ilnicka ◽  
Malgorzata Skorupska ◽  
Piotr Romanowski ◽  
Piotr Kamedulski ◽  
Jerzy P. Lukaszewicz
Keyword(s):  
Catalytic Activity ◽  
Photoelectron Spectroscopy ◽  
Noble Metals ◽  
Electrode Materials ◽  
Low Cost ◽  
Rapid Development ◽  
Reduction Reaction ◽  
Graphene Sheets ◽  
High Catalytic Activity ◽  
Energy Storage Devices

The constantly growing demand for active, durable, and low-cost electrocatalysts usable in energy storage devices, such as supercapacitors or electrodes in metal-air batteries, has triggered the rapid development of heteroatom-doped carbon materials, which would, among other things, exhibit high catalytic activity in the oxygen reduction reaction (ORR). In this article, a method of synthesizing nitrogen-doped graphene is proposed. Few-layered graphene sheets (FL-graphene) were prepared by electrochemical exfoliation of commercial graphite in a Na2SO4 electrolyte with added calcium carbonate as a separator of newly-exfoliated FL-graphene sheets. Exfoliated FL-graphene was impregnated with a suspension of green algae used as a nitrogen carrier. Impregnated FL-graphene was carbonized at a high temperature under the flow of nitrogen. The N-doped FL-graphene was characterized through instrumental methods: high-resolution transmission electron microscopy, X-ray photoelectron spectroscopy, and Raman spectroscopy. Electrochemical performance was determined using cyclic voltamperometry and linear sweep voltamperometry to check catalytic activity in ORR. The N-doped electroexfoliated FL-graphene obeyed the four-electron transfer pathways, leading us to further test these materials as electrode components in rechargeable zinc-air batteries. The obtained results for Zn-air batteries are very important for future development of industry, because the proposed graphene electrode materials do not contain any heavy and noble metals in their composition.

Enhancement mechanism of sulfur dopants on the catalytic activity of N and P co-doped three-dimensional hierarchically porous carbon as a metal-free oxygen reduction electrocatalyst

2019 ◽  
Vol 9 (21) ◽  
pp. 5906-5914 ◽  
Author(s):  
Yongxi Zan ◽  
Zhengping Zhang ◽  
Meiling Dou ◽  
Feng Wang
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction ◽  
Porous Carbon ◽  
Three Dimensional ◽  
Nitrogen And Phosphorus ◽  
Free Oxygen ◽  
Hierarchically Porous ◽  
Metal Free ◽  
Enhancement Mechanism ◽  
Co Doped

A sulfur, nitrogen and phosphorus ternary-doped cattle-bone-derived hierarchically porous carbon metal-free electrocatalyst was synthesized, exhibiting superior oxygen reduction performance compared to Pt/C.

Nitrogen-enriched porous carbon supported Pd-nanoparticles as an efficient catalyst for the transfer hydrogenation of alkenes

2018 ◽  
Vol 42 (20) ◽  
pp. 16823-16828 ◽  
Author(s):  
Jie Li ◽  
Xin Zhou ◽  
Ning-Zhao Shang ◽  
Cheng Feng ◽  
Shu-Tao Gao ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Pd Nanoparticles ◽  
Transfer Hydrogenation ◽  
High Catalytic Activity ◽  
Efficient Catalyst ◽  
Supported Pd

Well-dispersed Pd nanoparticles supported on nitrogen-enriched porous carbon were prepared and this material displayed excellent catalytic activity for the transfer hydrogenation of alkenes. The Pd@NPC catalyst exhibited high catalytic activity and stability for the hydrogenation of alkenes.

scholarly journals Direct Electrochemical Detection of Glutamate, Acetylcholine, Choline, and Adenosine Using Non-Enzymatic Electrodes

Sensors ◽  
2019 ◽  
Vol 19 (3) ◽  
pp. 447 ◽  
Author(s):  
Arash Shadlaghani ◽  
Mahsa Farzaneh ◽  
Dacen Kinser ◽  
Russell C. Reid
Keyword(s):  
Catalytic Activity ◽  
Electrochemical Sensors ◽  
Low Cost ◽  
High Surface ◽  
Critical Role ◽  
Electrochemically Active ◽  
Electron Transport Properties ◽  
Metal Materials ◽  
Living Organisms ◽  
Excellent Stability

Non-electroactive neurotransmitters such as glutamate, acetylcholine, choline, and adenosine play a critical role in proper activity of living organisms, particularly in the nervous system. While enzyme-based sensing of this type of neurotransmitter has been a research interest for years, non-enzymatic approaches are gaining more attention because of their stability and low cost. Accordingly, this focused review aims to give a summary of the state of the art of non-enzymatic electrochemical sensors used for detection of neurotransmitter that lack an electrochemically active component. In place of using enzymes, transition metal materials such as those based on nickel show an acceptable level of catalytic activity for neurotransmitter sensing. They benefit from fast electron transport properties and high surface energy and their catalytic activity can be much improved if their surface is modified with nanomaterials such as carbon nanotubes and platinum nanoparticles. However, a general comparison reveals that the performance of non-enzymatic biosensors is still lower than those that use enzyme-based methods. Nevertheless, their excellent stability demonstrates that non-enzymatic neurotransmitter sensors warrant additional research in order to advance them toward becoming an acceptable replacement for the more expensive enzyme-based sensors.

The Effect of AlCl3 and Ti on Hydrogen Storage Performance of 4MgH2-Li3AlH6 System

2016 ◽  
Vol 852 ◽  
pp. 876-882
Author(s):  
Fang Yu ◽  
Fen Xu ◽  
Li Xian Sun ◽  
Xiang Fei Zhang ◽  
Lin Wang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Hydrogen Storage ◽  
Onset Temperature ◽  
High Catalytic Activity ◽  
Storage Performance ◽  
Preparation Conditions ◽  
Solid Ball ◽  
Hydrogen Storage Performance ◽  
Co Doped

The AlCl3/Ti co-doped 4MgH2-Li3AlH6 has been successfully synthesized using solid ball-milled method. The effect of AlCl3/Ti and different preparation conditions on reversible hydrogen storage of 4MgH2-Li3AlH6 were investigated. It was found that the formed Al3Ti and Al can improve the de/rehydriding performance. The onset temperature of the system dehydrogenation decreased to 58 °C, and it can release hydrogen of 7.2 wt.% at 400 °C. The hydriding of the system was found that the adsorption rate greatly increased from 0.02 to 0.35 wt.% min-1. The activation energy (Ea) of MgH2 dehydrogenation decreased from 147 to 113.7 kJ mol-1 by adding additive AlCl3 and Ti. The AlCl3/Ti improved the thermodynamic and kinetic performance of the 4MgH2-Li3AlH6 composite, which was attributed to the high catalytic activity of Al3Ti and Al.

scholarly journals Bifunctional electrochemical properties of La0.8Sr0.2Co0.8M0.2O3-δ (M= Ni, Fe, Mn, Cu): efficient elemental doping based on structural and pH-dependent study

2021 ◽  
Author(s):  
Junfang Cheng ◽  
Pandian Ganesan ◽  
Ziling Wang ◽  
Ming Zhang ◽  
Guozhu Zhang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Evolution Reaction ◽  
Low Cost ◽  
Perovskite Oxides ◽  
Reduction Reaction ◽  
High Catalytic Activity ◽  
Suitable Candidate ◽  
Ph Dependent ◽  
Elemental Doping

Perovskite oxides with a low cost and high catalytic activity are considered as suitable candidate for oxygen evolution reaction (OER)/oxygen reduction reaction (ORR), whereas most of them favor only either...

Sign in / Sign up

Export Citation Format

Share Document