scholarly journals Multifunctional Polyoxometalate-Platforms for Supramolecular Light-driven Hydrogen Evolution

2021 ◽  
Author(s):  
Salam Maloul ◽  
Matthias van den Borg ◽  
Carolin Müller ◽  
Linda Zedler ◽  
Alexander Mengele ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Hydrogen Evolution ◽  
Platinum Complex ◽  
Pt Catalyst ◽  
Central Research ◽  
Energy Conversion And Storage ◽  
Visible Light Driven ◽  
The Individual ◽  
Electrostatic Coupling

Multifunctional supramolecular systems are a central research topic in light-driven solar energy conversion. Here, we report a polyoxometalate (POM)-based supramolecular dyad, where two platinum-complex hydrogen evolution catalysts are covalently anchored to an Anderson polyoxomolybdate anion. Supramolecular electrostatic coupling of the system to an iridium photosensitizer enables visible light-driven hydrogen evolution. Combined theory and experiment demon-strate the multifunctionality of the POM, which acts as photosensitizer / catalyst-binding-site and facilitates light-induced charge-transfer and catalytic turnover. Chemical modification of the Pt-catalyst site leads to increased hydrogen evolution reactivity. Mechanistic studies shed light on the role of the individual components and provide a molecular understanding of the interactions which govern stability and reactivity. The system could serve as a blueprint for multifunctional polyoxometalates in energy conversion and storage.

Embedding molecular photosensitizers and catalysts in nanoporous block copolymer membranes for visible-light driven hydrogen evolution

2020 ◽  
Vol 8 (13) ◽  
pp. 6238-6244 ◽  
Author(s):  
Iuliia Romanenko ◽  
Ashwene Rajagopal ◽  
Christof Neumann ◽  
Andrey Turchanin ◽  
Carsten Streb ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Visible Light ◽  
Energy Conversion ◽  
Hydrogen Evolution ◽  
Soft Matter ◽  
Great Promise ◽  
Visible Light Driven ◽  
Conversion Technologies

The integration of molecular photosensitizers and catalysts into functional soft matter supports holds great promise for future energy conversion technologies.

scholarly journals The Role of Electrocatalysis in a Sustainable Future: From Renewable Energy Conversion and Storage to Emerging Reactions

ChemPhysChem ◽  
2019 ◽  
Vol 20 (22) ◽  
pp. 2900-2903 ◽  
Author(s):  
Anthony P. O'Mullane ◽  
María Escudero‐Escribano ◽  
Ifan E. L. Stephens ◽  
Katharina Krischer
Keyword(s):  
Renewable Energy ◽  
Energy Conversion ◽  
Sustainable Future ◽  
Energy Conversion And Storage ◽  
And Storage

The role of nitrogen defects in graphitic carbon nitride for visible-light-driven hydrogen evolution

2019 ◽  
Vol 21 (5) ◽  
pp. 2318-2324 ◽  
Author(s):  
Jiawei Xue ◽  
Mamoru Fujitsuka ◽  
Tetsuro Majima
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Hydrogen Evolution ◽  
Light Absorption ◽  
Carbon Nitride ◽  
Graphitic Carbon ◽  
Graphitic Carbon Nitride ◽  
Visible Light Driven ◽  
Negative Factors

Extending the light absorption range of g-C3N4 by introducing N defects may be accompanied by some negative factors for the photocatalytic activity.

scholarly journals Hydrogen evolution from water using CdS as photosensitizer

1999 ◽  
Vol 1 (2) ◽  
pp. 75-78
Author(s):  
Tatiana Oncescu ◽  
M. Contineanu ◽  
Lucia Meahcov
Keyword(s):  
Hydrogen Evolution ◽  
Irradiation Time ◽  
Pt Catalyst ◽  
Redox Catalyst ◽  
System Temperature ◽  
Copolymer 1 ◽  
Brus Equation ◽  
Colloidal Cds

Colloidal chemical approaches are increasingly utilised for the preparation and stabilization of semiconductor nanoparticles.We prepared a colloidal CdS in excess ofNa2Susing a method described in the literature and determined the particle size from its absorption spectrum by Brus equation. A diameter of about 50Å was calculated. For the stabilization of colloid we choosed from various tested polymers a 1% in weight copolymer (1/1), styrene/maleic anhydride. As redox catalyst we used colloidal Pt obtained “in situ” by irradiaton ofPtCl6K2. We established the role of each of the system partners as: CdS concentration,Na2Sexcess, Pt catalyst concentration, the irradiation time, and the system temperature. We studied the influence of each participant to the hydrogen evolution in order to optimize this system.The formation of nanosize composite particlesCd1−xZnxSshowed an increasing ofH2amount generated under irradiation, in comparison with CdS particles.The results obtained permitted us to calculate the turnover number (TO) of the system.

Ultraviolet-induced Ostwald ripening strategy towards a mesoporous Ga2O3/GaOOH heterojunction composite with a controllable structure for enhanced photocatalytic hydrogen evolution

2020 ◽  
Vol 10 (9) ◽  
pp. 2882-2892
Author(s):  
Yuenan Zheng ◽  
Meihong Fan ◽  
Kaiqian Li ◽  
Rui Zhang ◽  
Xuefeng Li ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Hydrogen Evolution ◽  
Ostwald Ripening ◽  
Clean Energy ◽  
Great Promise ◽  
Oxide Materials ◽  
Photocatalytic Hydrogen Evolution ◽  
Energy Conversion And Storage ◽  
And Storage

The design of efficient semiconductor oxide materials with heterojunction nanostructures for photocatalysis holds great promise in the fields of clean energy conversion and storage.

Biomass willow catkin-derived Co3O4/N-doped hollow hierarchical porous carbon microtubes as an effective tri-functional electrocatalyst

2017 ◽  
Vol 5 (38) ◽  
pp. 20170-20179 ◽  
Author(s):  
Bin Wang ◽  
Li Xu ◽  
Gaopeng Liu ◽  
Pengfei Zhang ◽  
Wenshuai Zhu ◽  
...  
Keyword(s):  
Energy Conversion ◽  
Oxygen Reduction ◽  
Hydrogen Evolution ◽  
Oxygen Evolution ◽  
Porous Carbon ◽  
Electrochemical Reactions ◽  
Hierarchical Porous Carbon ◽  
Hierarchical Porous ◽  
Energy Conversion And Storage ◽  
And Storage

Oxygen reduction (ORR), oxygen evolution (OER), and hydrogen evolution (HER) reactions are extremely important electrochemical reactions for electrochemical energy conversion and storage.

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