Facile Fabrication of Highly Dispersed Pd@Ag Core-Shell Nanoparticles Embedded in Spirulina platensis by Electroless Deposition and Their Catalytic Properties

2018 ◽  
Vol 28 (20) ◽  
pp. 1707231 ◽  
Author(s):  
Lili Sun ◽  
Deyuan Zhang ◽  
Yanming Sun ◽  
Suying Wang ◽  
Jun Cai
Keyword(s):  
Spirulina Platensis ◽  
Electroless Deposition ◽  
Catalytic Properties ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Highly Dispersed ◽  
Facile Fabrication ◽  
Core Shell Nanoparticles

scholarly journals Core–shell Pd–P@Pt–Ni nanoparticles with enhanced activity and durability as anode electrocatalyst for methanol oxidation reaction

RSC Advances ◽  
2022 ◽  
Vol 12 (4) ◽  
pp. 2246-2252
Author(s):  
Jiangbin Guo ◽  
Man Zhang ◽  
Jing Xu ◽  
Jun Fang ◽  
Shuiyuan Luo ◽  
...  
Keyword(s):  
Catalytic Properties ◽  
Synergistic Effects ◽  
Methanol Oxidation Reaction ◽  
Core Shell ◽  
Ni Nanoparticles ◽  
Shell Nanoparticles ◽  
The Core ◽  
Core Shell Nanoparticles ◽  
Nickel Species ◽  
Low Crystalline

The Pd–P@Pt–Ni core–shell nanoparticles consist of an amorphous core and a low-crystalline shell. They exhibit the excellent catalytic properties in MOR owing to the double synergistic effects from the core and the nickel species in the shell.

Facile fabrication of pH-sensitive core–shell nanoparticles based on HEC and PMAA via template polymerization

2010 ◽  
Vol 46 (7) ◽  
pp. 1425-1435 ◽  
Author(s):  
Youwei Zhang ◽  
Qiaorong Jin ◽  
Jiongxin Zhao ◽  
Chengxun Wu ◽  
Qingqing Fan ◽  
...  
Keyword(s):  
Ph Sensitive ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Template Polymerization ◽  
Facile Fabrication ◽  
Core Shell Nanoparticles

Modification of a glassy carbon electrode with gold–platinum core–shell nanoparticles by electroless deposition and their electrocatalytic activity

RSC Advances ◽  
2015 ◽  
Vol 5 (53) ◽  
pp. 42369-42375 ◽  
Author(s):  
N. S. K. Gowthaman ◽  
S. Abraham John
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Electroless Deposition ◽  
Core Shell ◽  
Carbon Electrode ◽  
Deposition Method ◽  
Electrocatalytic Reduction ◽  
Shell Nanoparticles ◽  
Core Shell Nanoparticles ◽  
Gold Platinum

Gold@platinum core–shell nanoparticles were modified on a glassy carbon electrode by an electroless deposition method and then used for the electrocatalytic reduction of dioxygen and oxidation of hydrazine.

scholarly journals Stabilizing Highly Dispersed Halo Sites in Thermally Restructured Palladium Core@shell Nanoparticles for Improved Catalyst Activity and Durability

2021 ◽  
Author(s):  
Alexander Hill ◽  
Adarsh Bhat ◽  
Zachary Berquist ◽  
Galen Fisher ◽  
Andrej Lenert ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalyst Activity ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Highly Dispersed ◽  
Catalytically Active ◽  
Metal Support ◽  
The Stability ◽  
Material Utilization ◽  
Core Shell Nanoparticles

Stabilizing high dispersions of catalytically active metals is integral to improving the lifetime, activity, and material utilization of catalysts that are periodically exposed to high temperatures during operation or maintenance. We have found that annealing palladium-based core@shell catalysts in air at elevated temperature (800°C) promotes the redispersion of active metal into highly dispersed sites, which we refer to as halo sites. Here, we examine the restructuring of Pd@SiO2 and Pd@CeO2 core@shell catalysts over successive 800°C aging cycles to understand the formation, activity, nanoscale structure and stability of these palladium halo sites. While encapsulation generally improves metal utilization by providing a physical barrier that promotes redispersion over agglomeration, our cycled aging experiments demonstrate that halo sites are not stable in all catalysts. Halo sites continue to migrate in Pd@SiO2 due to poor metal-support bonding, which leads to palladium agglomeration. In contrast, halo sites formed in Pd@CeO2 remain stable. The dispersed palladium also synergistically stabilizes the ceria from agglomerating. We attribute this stability, in addition to an observed improvement in catalytic activity, to the coordination between palladium and reducible ceria that arises during the formation of halo sites. We probe the importance of ceria oxidation state on the stability of halo sites by aging Pd@CeO2 after it has been reduced. While some halo sites agglomerate, we find that returning to air aging mitigates the loss of these sites and catalytic activity. Our findings illustrate how nanoscale catalyst structures can be designed to promote the formation of highly stable and dispersed metal sites.

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