A5011709360- Electrocatalysts for Energy Conversion
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Photocatalysis Techniques
- Electrochemical Analysis and Applications
- Crystallography and molecular interactions
- Photosynthetic Processes and Mechanisms
- CO2 Reduction Techniques and Catalysts
- Porphyrin and Phthalocyanine Chemistry
- Luminescence and Fluorescent Materials
- Supramolecular Chemistry and Complexes
- Photochemistry and Electron Transfer Studies
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Advanced battery technologies research
- Conducting polymers and applications
- Catalysis and Oxidation Reactions
- Photodynamic Therapy Research Studies
- Copper-based nanomaterials and applications
- Porphyrin Metabolism and Disorders
- Molecular Sensors and Ion Detection
- Molecular Junctions and Nanostructures
- Quantum Dots Synthesis And Properties
- Semiconductor materials and devices
- Nanocluster Synthesis and Applications
University of Cambridge
2018-2023
University of St Andrews
2019
St. Andrews University
2019
Water oxidation is the step limiting efficiency of electrocatalytic hydrogen production from water. Spectroelectrochemical analyses are employed to make a direct comparison water reaction kinetics between molecular catalyst, dimeric iridium catalyst [Ir2(pyalc)2(H2O)4-(μ-O)]2+ (IrMolecular, pyalc = 2-(2'pyridinyl)-2-propanolate) immobilized on mesoporous indium tin oxide (ITO) substrate, with that an heterogeneous electrocatalyst, amorphous hydrous (IrOx) film. For both systems, four...
Dimerisation of a wide range fluorophores through multiple CB[8] clampings leads to constrained intracomplex motion and distinct photophysical properties.
Cucurbit[8]uril (CB[8]) mediated assembly of extended aryl viologens (EVs) into optically tunable dimers is reported for the first time. We show that modular design and synthesis a new class π-conjugated viologen derivatives with rigid aromatic or heteroaromatic bridging units as well electron donating molecular recognition motifs enable their self-assembly 2 : complexes CB[8]. The quantitative dimerization process involving these two components in an aqueous solution enables excimer-like...
Dye-sensitized photoelectrochemical (DSPEC) cells are an emerging approach to producing solar fuels. The recent development of delafossite CuCrO2 as a p-type semiconductor has enabled H2 generation through the coassembly catalyst and dye components. Here, we present electrode based on high-surface-area inverse opal (IO) architecture with benchmark performance in DSPEC generation. Coimmobilization phosphonated diketopyrrolopyrrole (DPP-P) or perylene monoimide (PMI-P) molecular Ni (NiP)...
A series of six novel [Ir(C^N)2(N^N)](PF6) complexes (C^N is one two cyclometalating ligands: 2-phenyl-4-(2,4,6-trimethylphenyl)pyridine, MesppyH, or 2-(napthalen-1-yl)-4-(2,4,6-trimethylphenyl)pyridine, MesnpyH; N^N denotes four neutral diamine 4,4'-di-tert-butyl-2,2'-bipyridine, dtbubpy, 1H,1'H-2,2'-bibenzimiazole, H2bibenz, 1,1'-(α,α'-o-xylylene)-2,2'-bibenzimidazole, o-xylbibenz 2,2'-biquinoline, biq) were synthesised and their structural, electrochemical photophysical properties...
Construction of a water oxidising photoanode with an organic chromophore-catalyst dyad.
Performing quantitative in situ spectroscopic analysis on minuscule sample volumes is a common difficulty photochemistry. To address this challenge, we use hollow-core photonic crystal fiber (HC-PCF) that guides light at the center of microscale liquid channel and acts as an optofluidic microreactor with reaction volume less than 35 nL. The system was used to demonstrate optical detection photoreduction processes are key components many photocatalytic schemes. viologens (XV2+) radical XV•+...
Using transient spectroelectrochemical techniques, we investigate multiply reduced states of molecular catalysts on titania photoelectrodes as a function the applied bias and light intensity.
We report a H2 evolving hybrid photocathode based on Sb2Se3 and precious metal free molecular catalyst. Through the use of high surface area TiO2 scaffold, we successfully increased Ni catalyst loading from 7.08 ± 0.43 to 45.76 0.81 nmol cm-2, achieving photocurrents 1.3 mA cm-2 at 0 V vs. RHE, which is 81-fold higher than device without mesoporous layer.
The stable and efficient integration of molecular catalysts into p-type semiconductor materials is a contemporary challenge in photoelectrochemical fuel synthesis. Here, we report the combination phosphonated Ni catalyst with TiO2 -coated La5 Ti2 Cu0.9 Ag0.1 S5 O7 photocathode for visible light driven H2 production. This hybrid assembly provides positive onset potential, large photocurrents, high Faradaic yield more than three hours. A decisive feature electrode interlayer, which stabilizes...
Hollow-core photonic crystal fibers (HC-PCFs) provide a novel approach for in situ UV/Vis spectroscopy with enhanced detection sensitivity. Here, we demonstrate that longer optical path lengths than afforded by conventional cuvette-based can be used to detect and identify the Co
We demonstrate that purification and size separation of polydisperse carbon dot materials unveils the real active nanoparticles enhances photocatalytic H 2 evolution using monodisperse dots.
Moritz F. Kuehnel opened a discussion of the paper by Andrew I. Cooper: What do you know about HOMO and LUMO localisation on polymers? I suppose this is strongly affected introducing heteroatoms such as sulfur, that causes changes observed when oxidising thiophene to
Optofluidic hollow-core photonic crystal fiber (HC-PCF) uniquely allows light to be guided at the centre of a microfluidic channel. The system maximizes interaction with infiltrated chemicals and (nano)particles, offering unique opportunities for in-situ optical monitoring range photochemical catalytic reactions [1,2]. Our current goal is extend this work hybrid colloidal systems comprising particulate absorber molecular catalyst photocatalytic fuel production [3]. Here we use HC-PCF...
Cucurbit[8]uril (CB[8]) mediated assembly of extended aryl viologens (EVs) into optically tunable dimers is reported for the first time. We show that modular design and synthesis a new class π-conjugated viologen derivatives with rigid aromatic or heteroaromatic bridging units as well electron donating molecular recognition motifs enable their self-assembly 2 : 2 complexes CB[8]. The quantitative dimerization process involving these two components in an aqueous solution enables excimer-like...
Multi-redox catalysis requires the transfer of more than one charge carrier and is crucial for solar energy conversion into fuels valuable chemicals. In photo(electro)chemical systems, however, necessary accumulation multiple, long-lived charges challenged by recombination with their counterparts. Herein, we investigate in two model multi-redox molecular catalysts proton CO 2 reduction attached onto mesoporous TiO electrodes. Transient absorption spectroscopy spectroelectrochemical...
Multi-redox catalysis requires the transfer of more than one charge carrier and is crucial for solar energy conversion into fuels valuable chemicals. In photo(electro)chemical systems, however, necessary accumulation multiple, long-lived charges challenged by recombination with their counterparts. Herein, we investigate in two model multi-redox molecular catalysts proton CO<sub>2</sub> reduction attached onto mesoporous TiO<sub>2</sub> electrodes. Transient absorption...