A5031719147- Electrocatalysts for Energy Conversion
- Electrochemical Analysis and Applications
- Molecular Junctions and Nanostructures
- Particle Accelerators and Free-Electron Lasers
- Advanced biosensing and bioanalysis techniques
- Protein Interaction Studies and Fluorescence Analysis
- Ammonia Synthesis and Nitrogen Reduction
- Advanced battery technologies research
- Metalloenzymes and iron-sulfur proteins
- Gold and Silver Nanoparticles Synthesis and Applications
- Synthesis and Properties of Aromatic Compounds
- Metal-Catalyzed Oxygenation Mechanisms
- Advanced Chemical Physics Studies
- Particle accelerators and beam dynamics
- Surface Chemistry and Catalysis
- Catalytic Processes in Materials Science
- Chemical Reaction Mechanisms
- Superconducting Materials and Applications
- Spectroscopy Techniques in Biomedical and Chemical Research
- Spectroscopy and Quantum Chemical Studies
- Electrochemical sensors and biosensors
- Synthesis and characterization of novel inorganic/organometallic compounds
- Sulfur-Based Synthesis Techniques
- Advanced X-ray Imaging Techniques
- Advanced Nanomaterials in Catalysis
Uppsala University
2022-2025
Indian Association for the Cultivation of Science
2015-2024
Fermi National Accelerator Laboratory
2022
Cockcroft Institute
2014
Sci-Tech Daresbury
2014
University of Liverpool
2014
Lancaster University
2014
University of Manchester
2014
Forschungszentrum Jülich
2008
Abstract Oxygen reduction and water oxidation are two key processes in fuel cell applications. The of to dioxygen is a 4 H + /4 e − process, while oxygen can be fully reduced by process or partially fewer electrons reactive species such as 2 O . We demonstrate that novel manganese corrole complex behaves bifunctional catalyst for both the electrocatalytic generation well aqueous media. Furthermore, our combined kinetic, spectroscopic, electrochemical study corroles adsorbed on different...
Abstract Oxygen reduction and water oxidation are two key processes in fuel cell applications. The of to dioxygen is a 4 H + /4 e − process, while oxygen can be fully reduced by process or partially fewer electrons reactive species such as 2 O . We demonstrate that novel manganese corrole complex behaves bifunctional catalyst for both the electrocatalytic generation well aqueous media. Furthermore, our combined kinetic, spectroscopic, electrochemical study corroles adsorbed on different...
Considering the importance of water splitting as best solution for clean and renewable energy, worldwide efforts development increasingly active molecular oxidation catalysts must be accompanied by studies that focus on elucidating mode actions catalytic pathways. One crucial challenge remains elucidation factors determine selectivity desired 4e–/4H+ pathway leads to O2 rather than 2e–/2H+ H2O2. We now show with cobalt–corrole CoBr8 electrocatalyst affords H2O2 main product in homogeneous...
[NiFe]-hydrogenase enzymes are efficient catalysts for H2 evolution but their synthetic models have not been reported to be active under aqueous conditions so far. Here we show that a close model of the site can work as very and stable heterogeneous catalyst mildly acidic conditions. Entry in catalysis is NiI FeII complex, with electronic structure analogous Ni-L state enzyme, corroborating mechanism modification recently proposed [NiFe]-hydrogenases.
We report the synthesis of an ambient-stable, ferrocene-embedded, anthraquinodimethane-based phosphaquinoid. The compound exhibits a pronounced butterfly-like distortion anthrylene core adopting highly contorted geometry in solid-state.
This report describes the conceptual design of a proposed free electron laser test facility called CLARA that will be major upgrade to existing VELA accelerator at Daresbury Laboratory in UK. able number new schemes have been but require proof principle experiment confirm they perform as predicted. The primary focus on ultra short photon pulse generation which take lasers into whole regime, enabling area science emerge.
The protonation state of thiols in self-assembled monolayers (SAMs) on Ag and Au surfaces nanoparticles (NPs) has been an issue contestation.
Abstract Thiele's Hydrocarbons (THs) featuring a 9,10‐anthrylene core with switchable geometric and electronic configurations offer exciting possibilities in advanced functional materials. Despite significant advances main group‐based diradicaloids contemporary chemistry, group THs containing an anthrylene cores have remained elusive, primarily due to the lack of straightforward synthetic strategies inherent high reactivity these species. In this study, we utilize anthracene‐based phosphine...
Understanding the reactivity landscape for activation of water until formation O–O bond and O2 release in molecular chemistry is a decisive step guiding elaboration cost-effective catalysts oxygen-evolving reaction (OER). Copper(II) complexes have recently caught attention chemists as 4e–/4H+ oxidation process. While copper(IV) intermediate has been proposed reactive species, no spectroscopic signature reported so far. Copper(III) ligand radical species also formulated supported by...
Rhenium bipyridine tricarbonyl complexes, fac-[Re(bpy)(CO)3X]n+, are highly effective in selectively converting CO2 to CO under electrochemical and photochemical conditions. Despite numerous mechanistic studies aimed at understanding its reduction reaction (CO2RR) pathway, the intermediates further into catalytic cycle have escaped detection, steps leading product release remained elusive. In this study, employing stopped-flow mixing coupled with time-resolved infrared spectroscopy, we...
The Mo–S based inorganic salt ATM (ammonium tetrathiomolybdate) and cysteine containing peptides can form self-assembled adlayers on Au surfaces these modified electrode materials exhibit miscellaneous catalytic activities.
Cytochromes c are small water-soluble proteins that catalyze electron transfer in metabolism and energy conversion processes. Hydrogenobacter thermophilus cytochrome c552 presents a curious case displaying fluxionality of its heme axial methionine ligand; this behavior is altered by single point mutation the Q64 residue to N64 or V64, which fixes ligand configuration. The reorganization (λ) these variants experimentally determined using combination rotating disc electrochemistry,...
Abstract A bio‐inspired FeFe hydrogenase model which catalyses hydrogen evolution reaction (HER) in acidic solutions is immobilized polyaniline (PANI)‐based nanotubes. combination of analytical techniques reveals that this construct maintains both the molecular signatures complex and material properties PANI. The amine imine‐rich environment PANI chain amplifies inherent HER activity complex, allowing electrocatalytic at neutral pH, with lower overpotentials higher current densities compared...
Abstract [NiFe]‐hydrogenase enzymes are efficient catalysts for H 2 evolution but their synthetic models have not been reported to be active under aqueous conditions so far. Here we show that a close model of the site can work as very and stable heterogeneous catalyst mildly acidic conditions. Entry in catalysis is Ni I Fe II complex, with electronic structure analogous Ni‐L state enzyme, corroborating mechanism modification recently proposed [NiFe]‐hydrogenases.
Particle accelerators and storage rings have been transformative instruments of discovery, and, for many applications, innovations in particle-beam cooling a principal driver that success1. Beam reduces the spread particle positions momenta, while keeping number particles constant, combats diffusive effects, thereby enabling accumulation production preservation intense beams. In case colliders, increases likelihood observing rare physics events. One most important conceptual technological...
Influence of the protonation state guanidinium group, present in 2nd sphere an iron porphyrin complex, reduction nitrite to nitric oxide via {FeNO} 6 intermediate.
Reactions requiring controlled delivery of protons and electrons are important in storage energy small molecules. While control over proton transfer can be achieved by installing appropriate chemical functionality the catalyst, electron-transfer (ET) rates utilizing self-assembled monolayers (SAMs) on electrodes. Thus, a deeper understanding ET through SAM to an immobilized or covalently attached redox-active species is desirable. Long-range across several SAM-covered Au electrodes ferrocene...
In-operando spectroscopic observation of the intermediates formed during various electrocatalytic oxidation and reduction reactions is crucial to propose mechanism corresponding reaction. Surface-enhanced resonance Raman spectroscopy coupled rotating disk electrochemistry (SERRS-RDE), developed about a decade ago, proved be an excellent tool investigate heterogeneous oxygen reaction (ORR) catalyzed by synthetic iron porphyrin complexes under steady-state conditions in water. The information...
Abstract Thiele's Hydrocarbons (THs) featuring a 9,10‐anthrylene core with switchable geometric and electronic configurations offer exciting possibilities in advanced functional materials. Despite significant advances main group‐based diradicaloids contemporary chemistry, group THs containing an anthrylene cores have remained elusive, primarily due to the lack of straightforward synthetic strategies inherent high reactivity these species. In this study, we utilize anthracene‐based phosphine...
Abstract
The resonance Raman scattering (RRS) of 1-(2-pyridylazo)-2-naphthol in the neutral, basic and acidic solutions was reinvestigated. On basis states polarization bands neutral solution possible tautomeric forms compound basic, media, observed were assigned to different normal modes vibration pertaining molecule. Further, surface-enhanced (SERRS) spectra molecule (in methanol–water mixture) adsorbed on silver hydrosol recorded using excitation radiation identical with that for RRS. From an...