Enhanced catalytic activity of cobalt nanoparticles encapsulated with an N-doped porous carbon shell derived from hollow ZIF-8 for efficient synthesis of nitriles from primary alcohols in water

2019 ◽  
Vol 21 (16) ◽  
pp. 4334-4340 ◽  
Author(s):  
Kang-kang Sun ◽  
Jia-lin Sun ◽  
Guo-Ping Lu ◽  
Chun Cai
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Cobalt Catalyst ◽  
Cobalt Nanoparticles ◽  
Core Shell ◽  
Efficient Synthesis ◽  
Primary Alcohols ◽  
Mild Conditions ◽  
Core Shell Structure ◽  
Unique Core

A cobalt catalyst derived from a unique core–shell structure based on hollow ZIF-8 and ZIF-67 is prepared for the synthesis of nitriles from alcohols in water under mild conditions.

scholarly journals Enhancement of Photocatalytic Activity under Visible Light Irradiation via the AgI@TCNQ Core-Shell Structure

Materials ◽  
2019 ◽  
Vol 12 (10) ◽  
pp. 1679 ◽  
Author(s):  
Wanli Xie ◽  
Li Liu ◽  
Wenquan Cui ◽  
Weijia An
Keyword(s):  
Shell Structure ◽  
Active Sites ◽  
Photocatalytic Performance ◽  
Degradation Process ◽  
Charge Carriers ◽  
Core Shell ◽  
Transport Channel ◽  
Surface Active ◽  
Core Shell Structure ◽  
Unique Core

In this paper, a AgI@TCNQ photocatalyst with a core-shell structure was reported. A two-dimensional TCNQ (7,7,8,8-Tetracyanoquinodimethane) nanosheet, with a π-π conjugate structure, was used as a shell layer to realize the flexible coating on the surface of AgI nanoparticles. These special core-shell structure composites solve the key problems of the small interface of the bulk composites and the lesser charge transfer paths, which could accelerate the migration of photogenerated carriers. Thus, the AgI@TCNQ photocatalysts showed the better photodegradation performance for the methylene blue (MB) solution, and the degradation rate of AgI@TCNQ (1 wt.%) composite was 1.8 times than AgI under irradiation. The reactive species trapping experiments demonstrated that ·O2−, h+, and ·OH all participated in the MB degradation process. The photocatalytic mechanism of AgI@TCNQ composites could be rationally explained by considering the Z-scheme structure, resulting in a higher redox potential and more efficient separation of charge carriers. At the same time, the unique core-shell structure provides a larger contact area, expands the charge transport channel, and increases the surface active sites, which are beneficial for improving photocatalytic performance.

scholarly journals Synthesis and structure of free-standing germanium quantum dots and their application in live cell imaging

RSC Advances ◽  
2015 ◽  
Vol 5 (26) ◽  
pp. 20566-20573 ◽  
Author(s):  
Ali Karatutlu ◽  
Mingying Song ◽  
Ann P. Wheeler ◽  
Osman Ersoy ◽  
William R. Little ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Shell Structure ◽  
Live Cell Imaging ◽  
Cell Imaging ◽  
Core Shell ◽  
Free Standing ◽  
Bio Imaging ◽  
Core Shell Structure ◽  
Germanium Quantum Dots ◽  
Unique Core

Colloidally synthesized free-standing Ge qdots with a unique core–shell structure were demonstrated to be a viable bio-imaging probe.

Preparation, Characterization and Visible-Light Catalytic Activity of Core-Shell Structure NiFe2O4@TiO2 Ferrite Nanoparticles

2016 ◽  
Vol 680 ◽  
pp. 272-277
Author(s):  
Zhou Li Lu ◽  
Peng Zhao Gao ◽  
Rui Xue Ma ◽  
Yu Kun Sun ◽  
Dong Yun Li
Keyword(s):  
Catalytic Activity ◽  
Visible Light ◽  
Shell Structure ◽  
Shell Thickness ◽  
Spinel Ferrite ◽  
Sol Gel ◽  
Magnetic Core ◽  
Core Shell ◽  
Calcination Temperatures ◽  
Core Shell Structure

The core-shell structure NiFe2O4@TiO2 nanoparticles was successfully prepared using a sol-gel method, the influence of shell thickness and calcination temperatures on the composition, microstructure, magnetic properties and visible-light catalytic activity of the nanoparticles was studied by XRD, TEM, Uv–vis, vibrating sample magnetometer, etc. Results showed the main composition of core in NiFe2O4@TiO2 was spinel ferrite, and the shell was anatase TiO2, and theshell thickness increased significantly with the increase of TiO2 content, ranging from 10nm to 50nm. The Ms and Mr of nanoparticles decreased with the increase of TiO2 content, and no obvious reaction between the magnetic core and shell occurred; visible-light degradation percent of NiFe2O4@TiO2 nanoparticles increased along with the increase of TiO2 content, whereas the recovery rate of it decreased. Degradation percent and the recovery percent of NiFe2O4@TiO2-50 still reached 93.7% and 90.5%, even after 10 cycle times, respectively, possessing the excellent long-term stability.

Tuning the Band Structure of MoS2 via Co9S8@MoS2 Core–Shell Structure to Boost Catalytic Activity for Lithium–Sulfur Batteries

ACS Nano ◽  
2020 ◽  
Vol 14 (12) ◽  
pp. 17285-17294
Author(s):  
Boyu Li ◽  
Qingmei Su ◽  
Lintao Yu ◽  
Jun Zhang ◽  
Gaohui Du ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Band Structure ◽  
Shell Structure ◽  
Core Shell ◽  
Lithium Sulfur Batteries ◽  
Core Shell Structure ◽  
Lithium Sulfur

scholarly journals Tuning the Core–Shell Structure of Au144@Fe2O3 for Optimal Catalytic Activity for CO Oxidation

2018 ◽  
Vol 148 (8) ◽  
pp. 2315-2324
Author(s):  
Michelle Lukosi ◽  
Chengcheng Tian ◽  
Xinyi Li ◽  
Shannon M. Mahurin ◽  
Harry M. Meyer ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Co Oxidation ◽  
Shell Structure ◽  
Core Shell ◽  
The Core ◽  
Core Shell Structure

scholarly journals Bimetallic Au-Pd nanoparticles supported on silica with tunable core@shell structure: Enhanced catalytic activity of Pd(core)-Au(shell) over Au(core)-Pd(shell)

2021 ◽  
Author(s):  
Gauravjyoti Dutta Kalita ◽  
Podma Pollov Sarmah ◽  
Golap Kalita ◽  
Pankaj Das
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Pd Nanoparticles ◽  
Metal Salts ◽  
Core Shell ◽  
Core Shell Structure

A facile ligand-assisted approach of synthesizing bimetallic Au-Pd nanoparticles supported on silica with tuneable core@shell structure is presented. Manoeuvring the addition sequence of metal salts, both Aucore-Pdshell (Au@Pd-SiO2) and Pdcore-Aushell...

One-pot selective N-formylation of nitroarenes to formamides catalyzed by core–shell structured cobalt nanoparticles

2018 ◽  
Vol 54 (64) ◽  
pp. 8913-8916 ◽  
Author(s):  
Xiaosu Dong ◽  
Zhaozhan Wang ◽  
Yanan Duan ◽  
Yong Yang
Keyword(s):  
High Activity ◽  
Cobalt Catalyst ◽  
Cobalt Nanoparticles ◽  
Core Shell ◽  
One Pot ◽  
Mild Conditions

A first heterogeneous non-noble cobalt catalyst for one-pot direct N-formylation of nitroarenes exhibiting high activity with a broad substrate scope under mild conditions is synthesised. It is easily separated with good recyclability.

Spatial acid–base–Pd triple-sites of a hierarchical core–shell structure for three-step tandem reaction

2020 ◽  
Vol 56 (46) ◽  
pp. 6297-6300 ◽  
Author(s):  
Jian Wu ◽  
Gang-Gang Chang ◽  
You-Qing Peng ◽  
Xiao-Chen Ma ◽  
Shan-Chao Ke ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Shell Structure ◽  
Tandem Reaction ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Acid Base ◽  
Core Shell Structure

We present a hierarchical single catalyst with spatial acid–base–Pd triple-sites showing high catalytic activity and stability for the three-step D–K–H tandem reaction.

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