Composition-controlled synthesis of carbon-supported Pt–Co alloy nanoparticles and the origin of their ORR activity enhancement

2014 ◽  
Vol 16 (36) ◽  
pp. 19298-19306 ◽  
Author(s):  
Yige Zhao ◽  
Jingjun Liu ◽  
Yanhui Zhao ◽  
Feng Wang
Keyword(s):  
Surface Structures ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Volcano Plot ◽  
Chemical Surface ◽  
Orr Activity ◽  
Specific Activities ◽  
Activity Enhancement ◽  
Alloy Catalysts ◽  
Unique Chemical

The mass-specific activities of the Pt–Co alloy catalysts manifest a typical double-volcano plot as a function of alloy compositions. The Pt76Co24 exhibits the best ORR performance, which is remarkably higher than that of the commercial Pt/C (E-TEK). The origin of the enhancement in the ORR activity may be substantially related to the unique chemical surface structures of catalysts.

Intrinsic ORR Activity Enhancement of Pt Atomic Sites by Engineering d‐Band Center via Local Coordination Tuning

2021 ◽  
Author(s):  
Xunyu Lu ◽  
Xiaofeng Zhu ◽  
Xin Tan ◽  
Kuang-Hsu Wu ◽  
Shu-Chih Haw ◽  
...  
Keyword(s):  
Band Center ◽  
Local Coordination ◽  
Orr Activity ◽  
Activity Enhancement

Tailoring the ultrafast and nonlinear photonics of MXenes through elemental replacement

Nanoscale ◽  
2021 ◽  
Author(s):  
Hualong Chen ◽  
Lingfeng Gao ◽  
Omar A Al-Hartomy ◽  
Feng Zhang ◽  
Ahmed A. Al Ghamdi ◽  
...  
Keyword(s):  
Electronic Properties ◽  
Optoelectronic Devices ◽  
Surface Termination ◽  
Chemical Surface ◽  
Elemental Compositions ◽  
New Generation ◽  
Unique Chemical ◽  
Nonlinear Photonics

Due to the outstanding electronic properties, unique chemical surface termination units and richness elemental compositions, MXenes have become promising candidates for developing new generation optoelectronic devices. However, there was still...

Size-controlled synthesis of Fe–Ni alloy nanoparticles by hydrogen reduction of metal chlorides

2006 ◽  
Vol 161 (3) ◽  
pp. 196-201 ◽  
Author(s):  
Yong Jae Suh ◽  
Hee Dong Jang ◽  
Hankwon Chang ◽  
Won Baek Kim ◽  
Heon Chang Kim
Keyword(s):  
Hydrogen Reduction ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Metal Chlorides ◽  
Ni Alloy ◽  
Size Controlled

scholarly journals Comparative Toxicity of CuZn Nanoparticles with Different Physical and Chemical Characteristics

2019 ◽  
Vol 35 (3) ◽  
pp. 973-981
Author(s):  
Sergey Miroshnikov ◽  
Elena Sizova ◽  
Elena Yausheva ◽  
Michael Uimin ◽  
Alexander Konev ◽  
...  
Keyword(s):  
Phase Composition ◽  
Specific Surface ◽  
Gas Phase ◽  
Metallic Copper ◽  
Zinc Alloy ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Phase Synthesis ◽  
Physical And Chemical ◽  
Test Cultures

In the experiment, the biological activity of copper and zinc alloy nanoparticles prepared by gas phase synthesis in an argon atmosphere was assessed. Nanoparticle preparations differed in phase composition and specific surface for CuZnNPs1 - 36 m2/g, CuZnNPs2 - 22 and CuZnNPs3 NP - 15 m2/g. As the test cultures, E.coli K12 TG1 pF1, E.coli K12 MG1655 katG::lux, E.coli MG1655 pRecA-lux, E.coli K12 MG1655 psoxS::lux were used. As the results showed, phase composition and specific surface area of nanoparticles were their toxicity factors. CuZnNPs3 is the most toxic among the studied samples, the percentage of zinc phase in it, in comparison with other tested powders, is the largest (52.3%), and the percentage of metallic copper is the smallest (7.9%). Within further works is to carry out controlled synthesis that will allow changing the toxicity of the nanoparticles under study by phase composition and specific surface.

Controlled synthesis, structure and magnetic properties of Fe1−xNix alloy nanoparticles attached on carbon nanotubes

2005 ◽  
Vol 406 (1-3) ◽  
pp. 148-153 ◽  
Author(s):  
Hua-Qiang Wu ◽  
Yun-Jie Cao ◽  
Pin-Shi Yuan ◽  
Hong-Yan Xu ◽  
Xian-Wen Wei
Keyword(s):  
Carbon Nanotubes ◽  
Magnetic Properties ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles

scholarly journals Size Controlled Synthesis of FeCo Alloy Nanoparticles and Study of the Particle Size and Distribution Effects on Magnetic Properties

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
A. Shokuhfar ◽  
S. S. S. Afghahi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Magnetic Properties ◽  
Molar Ratio ◽  
Microemulsion System ◽  
Controlled Synthesis ◽  
Alloy Nanoparticles ◽  
Feco Alloy ◽  
Transmission Electron ◽  
Size Controlled

In this research the size controlled synthesis of FeCo nanoparticles was done using a quaternary microemulsion system. X-ray diffraction and high resolution transmission electron microscopy of as-synthesized nanoparticles confirm the formation of FeCo alloy nanoparticles. The effects of two process parameters, namely, water to surfactant molar ratio and molar concentration of metal salts, on the size and size distribution of nanoparticles were discussed by the aid of transmission electron microscopy. The size dependency of magnetic properties was also investigated using a room temperature vibrating sample magnetometer. The superparamagnetic-ferromagnetic and single domain-multidomain transition sizes were determined. Then the specific absorption rates at transition sizes were calculated and the best sample for magnetic hyperthermia treatment was introduced.

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