scholarly journals Ag–Au Core–Shell Triangular Nanoprisms for Improving p-g-C3N4 Photocatalytic Hydrogen Production

Nanomaterials ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 3347
Author(s):  
Yali Guo ◽  
Anzhou Xu ◽  
Juan Hou ◽  
Qingcui Liu ◽  
Hailong Li ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Self Assembly ◽  
Rational Design ◽  
Photogenerated Electron ◽  
Core Shell ◽  
Co Catalyst ◽  
Replacement Method ◽  
Assembly Method ◽  
Free Replacement ◽  
Electron Holes

Ag–Au core–shell triangular nanoprisms (Ag@Au TNPs) have aroused extensive research interest in the field of hydrogen evolution reaction (HER) due to their strong plasmon effect and stability. Here, Ag@Au TNPs were fabricated by the galvanic-free replacement method. Then, we loaded them on protonated g-C3N4 nanoprisms (P–CN) by the electrostatic self-assembly method as an efficient plasmonic photocatalyst for HER. The hydrogen production rate of Ag@Au TNPs/P–CN (4.52 mmol/g/h) is 4.1 times higher than that of P–CN (1.11 mmol/g/h) under simulated sunlight irradiation, making it the most competitive material for water splitting. The formed Schottky junction helps to trap the hot electrons generated from Ag@Au TNPs, and the well-preserved tips of the Ag@Au TNPs can effectively generate an electromagnetic field to inhibit the photogenerated electron–holes pairs recombination. This study suggests that the rational design of Ag@Au TNPs by the galvanic-free replacement method is an effective co-catalyst for HER and boosting the additional combination of plasmonic metals and catalyst metals for the enhancement to HER.

A p-Si/NiCoSex core/shell nanopillar array photocathode for enhanced photoelectrochemical hydrogen production

2016 ◽  
Vol 9 (10) ◽  
pp. 3113-3119 ◽  
Author(s):  
Hongxiu Zhang ◽  
Qi Ding ◽  
Denghong He ◽  
Hu Liu ◽  
Wei Liu ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Rational Design ◽  
Hydrogen Generation ◽  
Core Shell ◽  
Photoelectrochemical Hydrogen Production

We report the rational design and successful preparation of p-Si/NiCoSex core/shell nanopillar array photocathodes for enhanced solar-driven photoelectrochemical hydrogen generation.

Preparation and characterization of poly(styrenemethacrylic acid)/MCM-41 core/shell nanocomposite microspheres

e-Polymers ◽  
2009 ◽  
Vol 9 (1) ◽  
Author(s):  
Yansheng Zhao ◽  
Xingji Ma ◽  
Yongmei Liu ◽  
Guangwei Yuan ◽  
Meijuan Guo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cetyltrimethylammonium Bromide ◽  
Average Diameter ◽  
Molar Ratio ◽  
Core Shell ◽  
Acidic Media ◽  
Assembly Method ◽  
20 Nm ◽  
Mcm 41

AbstractIn acidic media, poly(styrene-methacrylic acid)/MCM-41 [P(St- MAA)/MCM-41] core/shell microspheres were synthesized using monodisperse P(St-MAA) particles contained in soap-free emulsion and cetyltrimethylammonium bromide as co-templates by adsorption self-assembly method. The effects of P(St- MAA) composition on shell structure of the core/shell microspheres were investigated. The morphology and composition of P(St-MAA)/MCM-41 microspheres were characterized by TEM, XRD and FTIR. The results show that the ordering degree of MCM-41 shells increased as the molar ratio of MAA to St increased. When n(MAA)/n(St) is 0.2, the average diameter and the shell thickness of nanocomposite microspheres are about 170 nm and 20 nm, respectively.

scholarly journals Synthesis and Characterization of Amorphous Molybdenum Sulfide (MoSx)/CdIn2S4 Composite Photocatalyst: Co-Catalyst Using in the Hydrogen Evolution Reaction

Catalysts ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1455
Author(s):  
Qi Li ◽  
Wanli Liu ◽  
Xuejian Xie ◽  
Xianglong Yang ◽  
Xiufang Chen ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Separation Efficiency ◽  
Photogenerated Electron ◽  
Molybdenum Sulfide ◽  
Electron Hole ◽  
Composite Photocatalyst ◽  
Co Catalyst ◽  
Pair Separation ◽  
Electron Hole Pair

Co-catalyst deposition is used to improve the surface and electrical properties of photocatalysts. In this work, MoSx/CdIn2S4 nanocomposites were prepared by a facile hydrothermal and photodeposition route. The basic crystalline phases and morphology of the as-prepared samples were determined, and these results showed that MoSx was tightly anchored onto CdIn2S4 by sharing the same S atom. In the hydrogen production experiments, MoSx/CdIn2S4-40 displayed the optimal photocatalytic hydrogen production yield in 4 h. The H2 evolution rate reached 2846.73 μmol/g/h, which was 13.6-times higher than that of pure CdIn2S4. Analyzing the photocatalytic enhancement mechanisms revealed that this unique structure had a remarkable photogenerated electron-hole pair separation efficiency, rapid charge carrier transfer channels, and more abundant surface reaction sites. The use of co-catalyst (MoSx) greatly improved the photocatalytic activity of CdIn2S4.

scholarly journals Imposing control on self-assembly: rational design and synthesis of a mixed-metal, mixed-ligand coordination cage containing four types of component

2016 ◽  
Vol 7 (2) ◽  
pp. 910-915 ◽  
Author(s):  
Alexander J. Metherell ◽  
Michael D. Ward
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Mixed Ligand ◽  
Specific Site ◽  
Mixed Metal ◽  
Design And Synthesis ◽  
Assembly Method ◽  
Ligand Coordination ◽  
Stepwise Assembly

A stepwise assembly method, using a combination of kinetically inert and kinetically labile components, allows formation of a coordination cage based on four types of component with each component directed to a specific site.

scholarly journals Reprogramming bacterial protein organelles as a nanoreactor for hydrogen production

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Tianpei Li ◽  
Qiuyao Jiang ◽  
Jiafeng Huang ◽  
Catherine M. Aitchison ◽  
Fang Huang ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Self Assembly ◽  
Rational Design ◽  
Carbon Fixation ◽  
Catalytic Performance ◽  
Enzyme Activation ◽  
Production Of Hydrogen ◽  
Catalytically Active ◽  
Oxygen Sensitive ◽  
Protein Shell

Abstract Compartmentalization is a ubiquitous building principle in cells, which permits segregation of biological elements and reactions. The carboxysome is a specialized bacterial organelle that encapsulates enzymes into a virus-like protein shell and plays essential roles in photosynthetic carbon fixation. The naturally designed architecture, semi-permeability, and catalytic improvement of carboxysomes have inspired rational design and engineering of new nanomaterials to incorporate desired enzymes into the protein shell for enhanced catalytic performance. Here, we build large, intact carboxysome shells (over 90 nm in diameter) in the industrial microorganism Escherichia coli by expressing a set of carboxysome protein-encoding genes. We develop strategies for enzyme activation, shell self-assembly, and cargo encapsulation to construct a robust nanoreactor that incorporates catalytically active [FeFe]-hydrogenases and functional partners within the empty shell for the production of hydrogen. We show that shell encapsulation and the internal microenvironment of the new catalyst facilitate hydrogen production of the encapsulated oxygen-sensitive hydrogenases. The study provides insights into the assembly and formation of carboxysomes and paves the way for engineering carboxysome shell-based nanoreactors to recruit specific enzymes for diverse catalytic reactions.

scholarly journals Synthesis and Characterization of Bio-Active GFP-P4VP Core–Shell Nanoparticles

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 627
Author(s):  
Erik Sarnello ◽  
Yuzi Liu ◽  
Bethany Palen ◽  
Elaine Sun ◽  
Xiaobing Zuo ◽  
...  
Keyword(s):  
Self Assembly ◽  
Core Protein ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Assembly Method ◽  
Synthetic Materials ◽  
Transmission Electron ◽  
Core Shell Nanoparticles ◽  
Enzyme Functionality

Bioactive core–shell nanoparticles (CSNPs) offer the unique ability for protein/enzyme functionality in non-native environments. For many decades, researchers have sought to develop synthetic materials which mimic the efficiency and catalytic power of bioactive macromolecules such as enzymes and proteins. This research studies a self-assembly method in which functionalized, polymer-core/protein-shell nanoparticles are prepared in mild conditions. Transmission electron microscopy (TEM) and dynamic light scattering (DLS) techniques were utilized to analyze the size and distribution of the CSNPs. The methods outlined in this research demonstrate a mild, green chemistry synthesis route for CSNPs which are highly tunable and allow for enzyme/protein functionality in non-native conditions.

Rational design of octahedron and nanowire CeO2@MnO2 core–shell heterostructures with outstanding rate capability for asymmetric supercapacitors

2015 ◽  
Vol 51 (80) ◽  
pp. 14840-14843 ◽  
Author(s):  
Shi Jin Zhu ◽  
Jia Qi Jia ◽  
Tian Wang ◽  
Dong Zhao ◽  
Jian Yang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Rational Design ◽  
Rate Capability ◽  
Core Shell ◽  
Asymmetric Supercapacitors ◽  
Assembly Strategy

Two kinds of novel CeO2@MnO2 nanostructures have been synthesized via a self-assembly strategy.

scholarly journals Core-Shell Nanoencapsulation of α-Tocopherol by Blending Sodium Oleate and Rebaudioside A: Preparation, Characterization, and Antioxidant Activity

Molecules ◽  
2018 ◽  
Vol 23 (12) ◽  
pp. 3183 ◽  
Author(s):  
Junbo He ◽  
Hao Shi ◽  
Shuangshuang Huang ◽  
Lijuan Han ◽  
Weinong Zhang ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Sodium Oleate ◽  
Self Assembly ◽  
Hydrophobic Interactions ◽  
Core Shell ◽  
Rebaudioside A ◽  
Ambient Conditions ◽  
First Order Kinetics ◽  
Assembly Method ◽  
Freeze Dried

Nanoencapsulation of α-tocopherol (α-TOC) by blending sodium oleate (NaOl) and rebaudioside A (RebA) was successfully prepared by self-assembly method under mild conditions. The optimized nanoemulsion showed the loading capacity of α-TOC was 30 wt% of sodium oleate. FTIR analysis suggested that hydrogen bonds and hydrophobic interactions were the major forces in α-TOC-NaOl/RebA complexes that were spherical and possessed well-distinguishable core-shell structures. The freeze-dried α-TOC-NaOl/RebA complexes had great stability under ambient conditions. The release profile of α-TOC showed a first-order kinetics reaching around 67.9% after 90 h at 25 °C. Nanoencapsulation improved dispersibility and greatly increased the antioxidant activity of α-TOC. Therefore, the stable α-TOC-NaOl/RebA core-shell complexes prepared from “generally recognized as safe” (GRAS) ingredients have great potential to supplement α-TOC in food and cosmetic products.

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