A5067861299- Electrochemical sensors and biosensors
- Electrochemical Analysis and Applications
- Iron oxide chemistry and applications
- Advanced battery technologies research
- CO2 Reduction Techniques and Catalysts
- Metalloenzymes and iron-sulfur proteins
- Ammonia Synthesis and Nitrogen Reduction
- Mine drainage and remediation techniques
- Enzyme Catalysis and Immobilization
- Photosynthetic Processes and Mechanisms
- Biochemical and Molecular Research
- Microbial Fuel Cells and Bioremediation
- Advanced Photocatalysis Techniques
- Chemical and Physical Properties of Materials
- Metallurgical and Alloy Processes
- Electrohydrodynamics and Fluid Dynamics
- Clay minerals and soil interactions
- Electrocatalysts for Energy Conversion
- Photoreceptor and optogenetics research
- Nanocluster Synthesis and Applications
- Molecular Junctions and Nanostructures
- Molten salt chemistry and electrochemical processes
- Advancements in Solid Oxide Fuel Cells
University of Oxford
2019-2021
Uppsala University
2019
In living cells, redox chains rely on nanoconfinement using tiny enclosures, such as the mitochondrial matrix or chloroplast stroma, to concentrate enzymes and limit distances that nicotinamide cofactors other metabolites must diffuse. a chemical analogue exploiting this principle, adenine dinucleotide phosphate (NADPH) NADP+ are cycled rapidly between ferredoxin-NADP+ reductase second enzyme-the pairs being juxtaposed within 5-100 nm scale pores of an indium tin oxide electrode. The...
Abstract Multistep enzyme-catalyzed cascade reactions are highly efficient in nature due to the confinement and concentration of enzymes within nanocompartments. In this way, rates exceptionally high, loss intermediates minimised. Similarly, extended enzyme cascades trapped crowded nanoconfined environment a porous conducting metal oxide electrode material form basis powerful way study exploit myriad complex biocatalytic pathways. One confined enzymes, ferredoxin-NADP + reductase, serves as...
Reduction of CO2 and its direct entry into organic chemistry is achieved efficiently in a highly visible way using metal oxide electrode which two enzyme catalysts, one for electrochemically regenerating reduced nicotinamide adenine dinucleotide phosphate the other assimilating converting pyruvate (C3) to malate (C4), are entrapped within nanopores. The resulting reversible electrocatalysis exploited construct solar reduction/water-splitting device producing O2 C4 with high faradaic efficiency.
Hydrogenase-1 (Hyd-1) from E. coli poses a conundrum regarding the properties of electrocatalytic reversibility and associated bidirectionality now established for many redox enzymes. Its excellent H2-oxidizing activity begins only once substantial overpotential is applied, it cannot produce H2. A major reason its unidirectional behavior that reduction potentials electron-relaying FeS clusters are too positive relative to 2H+/H2 couple at neutral pH; consequently, electrons held within...
Abstract In living cells, the overall rates of catalytic reaction chains (cascades) are massively enhanced by nanoconfinement enzymes in tiny enclosed volumes: presented such a way, interdependent catalysts highly concentrated, and distances (active site‐to‐active site) across which intermediates cofactors must diffuse, may be tiny. parallel technology exploiting this principle, enzyme cascades powered, amplified, monitored real time as they work concert, being nanoconfined within pores an...
The redox state of the plastoquinone (PQ) pool in sulfur-deprived, H2-producing Chlamydomonas reinhardtii cells was studied using single flash-induced variable fluorescence decay kinetics. During H2 production, kinetics exhibited an unusual post-illumination rise fluorescence, giving a wave-like appearance. wave showed transient minimum at ~60 ms after flash, followed by rise, reaching maximum ~1 s before decaying back to initial level. Similar have been reported previously anaerobically...
Living organisms are characterized by the ability to process energy (all release heat). Redox reactions play a central role in biology, from transduction (photosynthesis, respiratory chains) highly selective catalyzed transformations of complex molecules. Distance and scale important: electrons transfer on 1 nm scale, hydrogen nuclei between molecules 0.1 extended catalytic processes (cascades) operate most efficiently when different enzymes under nanoconfinement (10 nm–100 scale). Dynamic...
Hematite (α-Fe2O3) is a promising and Earth-abundant material for solar fuel production, Si-doping has been employed as general strategy to improve its performance. However, an atomistic description that reconciles the modifications induces on morphology, crystalline lattice, electronic magnetic properties of α-Fe2O3 remained elusive. Here we report role electron small polarons in driving morphological transition from nearly rounded-shaped nanowire nanocrystals Si-doped hematite α-Fe2O3....
Abstract In living cells, redox chains rely on nanoconfinement using tiny enclosures, such as the mitochondrial matrix or chloroplast stroma, to concentrate enzymes and limit distances that nicotinamide cofactors other metabolites must diffuse. a chemical analogue exploiting this principle, adenine dinucleotide phosphate (NADPH) NADP + are cycled rapidly between ferredoxin–NADP reductase second enzyme—the pairs being juxtaposed within 5–100 nm scale pores of an indium tin oxide electrode....
Understanding the interplay between structural, chemical and physical properties of nanomaterials is crucial for designing new devices with enhanced performance. In this regards, doping metal oxides a general strategy to tune size, morphology, charge, lattice, orbital spin degrees freedoms has been shown affect photoelectrochemical water splitting, batteries, catalysis, magnetic applications optics. Here we report role lattice small polaron in driving morphological transition from nearly...