scholarly journals Collective excitation of plasmon-coupled Au-nanochain boosts photocatalytic hydrogen evolution of semiconductor

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Guiyang Yu ◽  
Jun Qian ◽  
Peng Zhang ◽  
Bo Zhang ◽  
Wenxiang Zhang ◽  
...  
Keyword(s):  
Electromagnetic Field ◽  
Metal Nanoparticles ◽  
Hydrogen Evolution ◽  
Rational Design ◽  
Collective Excitation ◽  
Formation Rate ◽  
Building Blocks ◽  
Localized Surface Plasmon ◽  
Plasmonic Enhancement ◽  
Photocatalytic Hydrogen Evolution

Abstract Localized surface plasmon resonance (LSPR) offers a valuable opportunity to improve the efficiency of photocatalysts. However, plasmonic enhancement of photoconversion is still limited, as most of metal-semiconductor building blocks depend on LSPR contribution of isolated metal nanoparticles. In this contribution, the concept of collective excitation of embedded metal nanoparticles is demonstrated as an effective strategy to enhance the utilization of plasmonic energy. The contribution of Au-nanochain to the enhancement of photoconversion is 3.5 times increase in comparison with that of conventional isolated Au nanoparticles. Experimental characterization and theoretical simulation show that strongly coupled plasmonic nanostructure of Au-nanochain give rise to highly intensive electromagnetic field. The enhanced strength of electromagnetic field essentially boosts the formation rate of electron-hole pair in semiconductor, and ultimately improves photocatalytic hydrogen evolution activity of semiconductor photocatalysts. The concept of embedded coupled-metal nanostructure represents a promising strategy for the rational design of high-performance photocatalysts.

Graphdiyne formed a novel CuI-GD/g-C3N4 S-scheme heterojunction composite for efficient photocatalytic hydrogen evolution

2020 ◽  
Vol 4 (10) ◽  
pp. 5088-5101 ◽  
Author(s):  
Zhiliang Jin ◽  
Lijun Zhang ◽  
Guorong Wang ◽  
Yanbing Li ◽  
Yanbin Wang
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Green Energy ◽  
Hydrogen Energy ◽  
Fossil Energy ◽  
Photocatalytic Hydrogen Evolution ◽  
Energy Demands

Rational design of novel and efficient hybrid photocatalysts has great significance today, as fossil energy demands urgent need to be replaced by green energy, such as the hydrogen energy.

An amorphous nickel boride-modified ZnxCd1−xS solid solution for enhanced photocatalytic hydrogen evolution

2020 ◽  
Vol 49 (4) ◽  
pp. 1220-1231 ◽  
Author(s):  
Yue Cao ◽  
Guorong Wang ◽  
Qingxiang Ma ◽  
Zhiliang Jin
Keyword(s):  
Solid Solution ◽  
Hydrogen Evolution ◽  
Rational Design ◽  
Co Catalyst ◽  
Nickel Boride ◽  
Photocatalytic Hydrogen Evolution

In this work, the rational design of amorphous NixB as a co-catalyst for the modification of ZnxCd1−xS was achieved.

scholarly journals Rational design of isostructural 2D porphyrin-based covalent organic frameworks for tunable photocatalytic hydrogen evolution

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Rufan Chen ◽  
Yang Wang ◽  
Yuan Ma ◽  
Arindam Mal ◽  
Xiao-Ya Gao ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Hydrogen Generation ◽  
Structure Design ◽  
Molecular Engineering ◽  
Valuable Insight ◽  
Covalent Organic Frameworks ◽  
Structure Property ◽  
Photocatalytic Hydrogen Evolution ◽  
Photocatalytic Hydrogen Generation

AbstractCovalent organic frameworks have recently gained increasing attention in photocatalytic hydrogen generation from water. However, their structure-property-activity relationship, which should be beneficial for the structural design, is still far-away explored. Herein, we report the designed synthesis of four isostructural porphyrinic two-dimensional covalent organic frameworks (MPor-DETH-COF, M = H2, Co, Ni, Zn) and their photocatalytic activity in hydrogen generation. Our results clearly show that all four covalent organic frameworks adopt AA stacking structures, with high crystallinity and large surface area. Interestingly, the incorporation of different transition metals into the porphyrin rings can rationally tune the photocatalytic hydrogen evolution rate of corresponding covalent organic frameworks, with the order of CoPor-DETH-COF < H2Por-DETH-COF < NiPor-DETH-COF < ZnPor-DETH-COF. Based on the detailed experiments and calculations, this tunable performance can be mainly explained by their tailored charge-carrier dynamics via molecular engineering. This study not only represents a simple and effective way for efficient tuning of the photocatalytic hydrogen evolution activities of covalent organic frameworks at molecular level, but also provides valuable insight on the structure design of covalent organic frameworks for better photocatalysis.

The O/S Heteroatom effect of Covalent Triazine Framework for Photocatalytic Hydrogen Evolution

2021 ◽  
Author(s):  
Manying Liu ◽  
Kangni Yang ◽  
Zhenyang Li ◽  
Erchuang Fan ◽  
Like Zhang ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Building Blocks ◽  
Evolution Rate ◽  
Photocatalytic Hydrogen Evolution ◽  
Hydrogen Evolution Rate ◽  
Covalent Triazine Framework

The S/O heterocyclic covalent triazine frameworks (CTFs i.e., CTF – 7 and CTF - 8) were synthesized using thiophene and furan as building blocks, respectively. The hydrogen evolution rate of...

scholarly journals Structure–property–activity relationships in a pyridine containing azine-linked covalent organic framework for photocatalytic hydrogen evolution

2017 ◽  
Vol 201 ◽  
pp. 247-264 ◽  
Author(s):  
Frederik Haase ◽  
Tanmay Banerjee ◽  
Gökcen Savasci ◽  
Christian Ochsenfeld ◽  
Bettina V. Lotsch
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Molecular Level ◽  
Optoelectronic Properties ◽  
Atomic Scale ◽  
Structure Property ◽  
Photocatalytic Hydrogen Evolution ◽  
Previous Design ◽  
Nitrogen Substitution ◽  
New Generation

Organic solids such as covalent organic frameworks (COFs), porous polymers and carbon nitrides have garnered attention as a new generation of photocatalysts that offer tunability of their optoelectronic properties both at the molecular level and at the nanoscale. Owing to their inherent porosity and well-ordered nanoscale architectures, COFs are an especially attractive platform for the rational design of new photocatalysts for light-induced hydrogen evolution. In this report, our previous design strategy of altering the nitrogen content in an azine-linked COF platform to tune photocatalytic hydrogen evolution is extended to a pyridine-based photocatalytically active framework, where nitrogen substitution in the peripheral aryl rings reverses the polarity compared to the previously studied materials. We demonstrate how simple changes at the molecular level translate into significant differences in atomic-scale structure, nanoscale morphology and optoelectronic properties, which greatly affect the photocatalytic hydrogen evolution efficiency. In an effort to understand the complex interplay of such factors, we carve out the conformational flexibility of the PTP-COF precursor and the vertical radical anion stabilization energy as important descriptors to understand the performance of the COF photocatalysts.

Rational design of benzodifuran-functionalized donor-acceptor covalent organic framework for photocatalytic hydrogen evolution from water

2021 ◽  
Author(s):  
Yu-Bin Dong ◽  
Guangbo Wang ◽  
Fu-Cheng Zhu ◽  
Qian-Qian Lin ◽  
Jing-Lan Kan ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Rational Design ◽  
Evolution Rate ◽  
Simulated Sunlight ◽  
Photocatalytic Hydrogen Evolution ◽  
Covalent Organic Framework ◽  
Hydrogen Evolution Rate ◽  
Donor Acceptor ◽  
Organic Framework

A benzodifuran-based donor-acceptor covalent organic framework was synthesized and employed for efficient simulated sunlight-driven photocatalytic hydrogen evolution from water, which exhibited superior and steady hydrogen evolution rate of 1390 μmol...

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