A5079343198- Fuel Cells and Related Materials
- Molecular Junctions and Nanostructures
- Nanopore and Nanochannel Transport Studies
- Electrocatalysts for Energy Conversion
- Membrane-based Ion Separation Techniques
- Spectroscopy and Quantum Chemical Studies
- Graphene research and applications
- Force Microscopy Techniques and Applications
- Electrochemical Analysis and Applications
- Magnetism in coordination complexes
- Metal and Thin Film Mechanics
- Advanced Battery Technologies Research
- Photosynthetic Processes and Mechanisms
- Photochemistry and Electron Transfer Studies
- Advancements in Battery Materials
- Photoreceptor and optogenetics research
Leiden University
2020-2024
Industriale Chimica (Italy)
2020
Abstract The photosynthetic apparatus of higher plants can dissipate excess excitation energy during high light exposure, by deactivating excited chlorophylls through a mechanism called nonphotochemical quenching (NPQ). However, the precise molecular details and regulating level are still not completely understood. Focusing on major light-harvesting complex LHCII Photosystem II, we show that charge transfer state involving Lutein efficiently quench chlorophyll excitation, reduce lifetime to...
A fundamental understanding of proton transport through graphene nanopores, defects, and vacancies is essential for advancing two-dimensional exchange membranes (PEMs). This study employs ReaxFF molecular dynamics, metadynamics, density functional theory to investigate the enhanced a nanopore. Covalently functionalizing nanopore with benzenesulfonic group yields consistent improvements in permeability, lower activation barrier (≈0.15 eV) increased selectivity over sodium cations. The...
Molecularly thin, nanoporous thin films are of paramount importance in material sciences. Their use a wide range applications requires control over their chemical functionalities, which is difficult to achieve using current production methods. Here, the small polycyclic aromatic hydrocarbon decacyclene used form molecular films, without requiring covalent crosslinking any kind. The 2.5 nm mechanically stable, able be free-standing micrometer distances, held together solely by supramolecular...
The oligomeric ruthenium-based water oxidation catalyst, Ru(bda), is known to be experimentally anchored on graphitic surfaces through CH-π stacking interactions between the auxiliary bda ([2,2'-bipyridine]-6,6'-dicarboxylate) ligand bonded ruthenium and hexagonal rings of surface. This anchoring provides control over their molecular coverage enables efficient catalysis dioxygen. nature molecule offers multiple sites at surface, greatly enhancing overall stability hybrid catalyst-graphitic...
<title>Abstract</title> An ideal proton exchange membrane should only permeate protons and be leak-tight for fuels. Graphene is impermeable to water poorly conducting protons. Next long-term stability an optimized therefore needs fulfil two main criteria: permeability selectivity. Within methanol fuel cells, the first ensures a high-power density, while second prevents cross-over between electrodes, which deteriorates catalyst performance and, thereby, drastically lowers performance....
In the past decade, Ru-bda (bda = 2,2′-bipyridine-6,6′-dicarboxylic acid) complexes have emerged as extremely effective water oxidation catalysts, rendering them a potential candidate for incorporation into dye-sensitized photoelectrochemical cells. However, performance of these catalysts declines dramatically when anchored to photoanode surface due their catalytic mechanism involving interaction two metal centers (I2M). This reduced prompts an investigation cycle following alternative in...
An ideal proton exchange membrane should only permeate protons and be leak tight for fuels. Graphene is impermeable to water poorly conducting protons. Here, we chemically functionalized monolayer graphene install sulfophenylated sp3 dislocations by diazotization. Selective protons, transmembrane areal conductances are up ~50 S/cm2, which ~5000 fold higher than in pristine graphene. Mounted a direct methanol fuel cell, resulted power densities 1.6 W/mg or 123 mW/cm under standard cell...