Robust FeCo nanoparticles embedded in a N-doped porous carbon framework for high oxygen conversion catalytic activity in alkaline and acidic media

2018 ◽  
Vol 6 (46) ◽  
pp. 23445-23456 ◽  
Author(s):  
Xuan-Wen Gao ◽  
Junghoon Yang ◽  
Kyeongse Song ◽  
Wen-Bin Luo ◽  
Shi-Xue Dou ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Graphitic Carbon ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
Acidic Media ◽  
Highly Active ◽  
Carbon Framework ◽  
Feco Nanoparticles ◽  
Oxygen Conversion

FeCo alloy nanoparticles were nucleated onto graphitic carbon layers through the pyrolysis of polydopamine (PDA) sub-micrometer spheres to form a highly active electrocatalytic system that exhibits excellent oxygen conversion catalytic activity in both alkaline and acidic media.

Colloidal synthesis of monodisperse trimetallic IrNiFe nanoparticles as highly active bifunctional electrocatalysts for acidic overall water splitting

2017 ◽  
Vol 5 (47) ◽  
pp. 24836-24841 ◽  
Author(s):  
Luhong Fu ◽  
Gongzhen Cheng ◽  
Wei Luo
Keyword(s):  
Synergistic Effect ◽  
Size Distribution ◽  
Water Splitting ◽  
Average Diameter ◽  
Colloidal Synthesis ◽  
Synthetic Method ◽  
Alloy Nanoparticles ◽  
Narrow Size Distribution ◽  
Acidic Media ◽  
Highly Active

Monodisperse IrNiFe alloy nanoparticles with an average diameter of 2.2 nm have been synthesized by a colloidal synthetic method. By taking advantage of the synergistic effect between Ir, Ni and Fe and the ultrasmall NPs with narrow size distribution, the as-synthesized IrNiFe catalyst exhibits superior HER/OER performances in acidic media.

scholarly journals Monodisperse AgPd alloy nanoparticles as a highly active catalyst towards the methanolysis of ammonia borane for hydrogen generation

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 105940-105947 ◽  
Author(s):  
Daohua Sun ◽  
Pengyao Li ◽  
Bin Yang ◽  
Yan Xu ◽  
Jiale Huang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Hydrogen Generation ◽  
Active Catalyst ◽  
Ammonia Borane ◽  
Alloy Nanoparticles ◽  
Highly Active

Monodisperse AgPd alloy NPs showed remarkable catalytic activity towards the generation of hydrogen from the methanolysis of ammonia borane at room temperature.

Hierarchical macrotube/mesopore carbon decorated with mono-dispersed Ag nanoparticles as a highly active catalyst

2015 ◽  
Vol 17 (4) ◽  
pp. 2515-2523 ◽  
Author(s):  
Tuo Ji ◽  
Long Chen ◽  
Michael Schmitz ◽  
Forrest Sheng Bao ◽  
Jiahua Zhu
Keyword(s):  
Catalytic Activity ◽  
Porous Carbon ◽  
Ag Nanoparticles ◽  
Active Catalyst ◽  
Carbon Substrate ◽  
Reduction Reactions ◽  
Highly Active ◽  
Nitrophenol Reduction

Mono-dispersed Ag nanoparticles supported on hierarchical macrotube/mesopore porous carbon substrate show excellent catalytic activity in nitrophenol reduction reactions.

A new synthesis of highly active Rh–Co alloy nanoparticles supported on N-doped porous carbon for catalytic C–Se cross-coupling and p-nitrophenol hydrogenation reactions

2021 ◽  
Author(s):  
Dicky Annas ◽  
Hack-Keun Lee ◽  
Shamim Ahmed Hira ◽  
Ji Chan Park ◽  
Kang Hyun Park
Keyword(s):  
Porous Carbon ◽  
Cross Coupling ◽  
Alloy Nanoparticles ◽  
Nitrogen Flow ◽  
Nitrogen Doped ◽  
Highly Active ◽  
Metal Precursors ◽  
New Synthesis ◽  
Hydrogenation Reactions ◽  
Co Nanoparticles

Bimetallic Rh–Co nanoparticles supported on nitrogen-doped porous carbon (Rh-Co/NPC) were synthesized from the metal precursors and urea through a simple thermal decomposition/reduction under a nitrogen flow. The Rh–Co/NPC nanocatalyst which...

Hard Magnetic Nanoparticles and Nanocomposites

1999 ◽  
Vol 577 ◽  
Author(s):  
Anit Giri ◽  
Krishna Chowdary ◽  
Sara A. Majetich
Keyword(s):  
High Performance ◽  
Permanent Magnets ◽  
Characteristic Length ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
Random Anisotropy ◽  
Sample Density ◽  
Anisotropy Model ◽  
Feco Nanoparticles ◽  
Exchange Length

ABSTRACTMany high performance permanent magnets are nanostructured materials. The magnetic properties of nanoparticles are discussed in terms of characteristic length scales, including the maximum monodomain size and the exchange length. Experimental results for ball milled SmCo5 nanoparticles are presented, showing deviations from idealized behavior. Because of the short exchange length, this can be understood in terms of independent nucleation of reverse domains in grains within larger particles. With a much longer exchange length, FeCo alloy nanoparticles show reduced coercivity in a high density compact, in accordance with the random anisotropy model. The SmCo5 and FeCo nanoparticles were mixed and compacted in an attempt to make an exchange spring nanocomposite. However, significant exchange between the hard and soft phases was not observed because the sample density was too low. Processing considerations for improved co-compaction of these nanoparticles are discussed.

Synthesis of FeCo Alloy Nanoparticles for Electromagnetic Absorber by Polyol Method

2020 ◽  
Vol 20 (8) ◽  
pp. 4926-4932
Author(s):  
Dae Seok Seo ◽  
Jong Hwan Park ◽  
Jae Chul Ro ◽  
Kyung Sub Lee ◽  
Su Jung Suh
Keyword(s):  
Electron Microscopy ◽  
Synthesis Temperature ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
X Ray Diffraction ◽  
Molar Ratios ◽  
Transmission Electron ◽  
Different Temperatures ◽  
Optimized Conditions ◽  
Feco Nanoparticles

The correlations among magnetic properties, synthesis temperature, and composition of FeCo nanoparticles were investigated herein. Fe80Co20 alloy nanoparticles synthesized at different temperatures (383, 393, 403, 413, 428, and 443 K) showed variable compositions and aggregation degrees of the FeCo nanoparticles. Under the optimized conditions of synthesis temperature of 403 K and duration of 1 h, FeCo nanoparticles were synthesized at molar ratios of 9:1, 8:2, 7:3, 6:4, 5:5, 4:6, 3:7, 2:8, and 1:9. The FeCo alloy nanoparticles were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, vibrating sample magnetometer, fourier transform infrared, and network analyzer. With increasing Co content, the extent of aggregation increased. The cobalt ferrite phase was detected under some conditions, and all FeCo nanoparticles showed high saturation magnetization and low coercive forces. The prepared FeCo nanoparticles exhibited high permeability at a high frequency range.

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