A5004372016- Electrocatalysts for Energy Conversion
- CO2 Reduction Techniques and Catalysts
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Advanced battery technologies research
- Catalytic Processes in Materials Science
- Ionic liquids properties and applications
- Catalysis and Oxidation Reactions
- Advanced Battery Technologies Research
- Catalysis for Biomass Conversion
- Advanced Battery Materials and Technologies
- Advancements in Battery Materials
- Ammonia Synthesis and Nitrogen Reduction
- Catalysis and Hydrodesulfurization Studies
- Advanced Photocatalysis Techniques
- Electromagnetic Compatibility and Measurements
- Machine Learning in Materials Science
- Spectroscopy and Quantum Chemical Studies
- Transport and Economic Policies
- Supercapacitor Materials and Fabrication
- Transportation Systems and Safety
- Hydrogen Storage and Materials
- Oxidative Organic Chemistry Reactions
- Phase-change materials and chalcogenides
- Electronic and Structural Properties of Oxides
University of Copenhagen
2023-2025
Imperial College London
1998-2025
Imperial Valley College
2021-2023
Technical University of Denmark
2015-2022
Institute of Catalysis and Petrochemistry
2019
Joint Center for Artificial Photosynthesis
2016
Lawrence Berkeley National Laboratory
2016
CO electroreduction activity on oxide-derived Cu (OD-Cu) was found to correlate with metastable surface features that bind strongly. OD-Cu electrodes prepared by H2 reduction of Cu2O precursors reduce acetate and ethanol nearly 50% Faradaic efficiency at moderate overpotential. Temperature-programmed desorption revealed the presence sites strong binding are distinct from terraces stepped polycrystalline foil. After annealing 350 °C, surface-area corrected current density for is 44-fold lower...
Abstract Understanding what controls the reaction rate on iridium-based catalysts is central to designing better electrocatalysts for water oxidation in proton exchange membrane electrolysers. Here we quantify densities of redox-active centres and probe their binding strengths amorphous IrO x rutile 2 using operando time-resolved optical spectroscopy. We establish a quantitative experimental correlation between intrinsic active-state energetics. find that adsorbed oxygen species, *O, formed...
By live-monitoring Cu and Cu2O Bragg peaks from the surface of a polycrystalline electrode while scanning open-circuit potential to CO reduction potentials, we show that near-surface region is fully converted metallic phase at approximately +0.3 V vs RHE.
The roles of hydrogen impurity and oxygen vacancy defects on defining the conductivity, hence photoelectrochemical (PEC) performance characteristics, monoclinic scheelite bismuth vanadate (BiVO4) are investigated using a combination experiment theory. We find that elemental is present as an in as-synthesized BiVO4 increasing its concentration by annealing H2 at temperatures up to 290 °C leads near-complete elimination majority carrier transport limitations, beneficial shift photoanodic...
The operating conditions of low pH and high potential at the anodes polymer electrolyte membrane electrolysers restrict choice catalysts for oxygen evolution reaction (OER) to oxides based on rare metals iridium or ruthenium. In this work, we investigate stability both metal atoms and, by quantitative highly sensitive
The selective electrovalorisation of furfural towards drop-in fuel precursors on single-atom molecular catalysts at ambient conditions via a possible radical coupling pathway.
A barrier to understanding the factors driving catalysis in oxygen evolution reaction (OER) is multiple overlapping redox transitions OER catalysts. The complexity of these obscure relationship between coverage adsorbates and kinetics, leading an experimental challenge measuring activity descriptors, such as binding energies, well adsorbate interactions, which may destabilize intermediates modulate their energies. Herein, we utilize a newly designed optical spectroelectrochemistry system...
High coverage of the catalyst surface generated by <italic>in situ</italic> degradation propene steers reaction towards allylic oxidation.
By measuring O 2 with high sensitivity, we open a mechanistic window into water oxidation on RuO x in acid.
Combining theory and experiment, we unveil the mechanisms for furfural electroreduction on copper provide a rationale to tune reaction conditions increase activity towards value-added products.
Electrocatalytic current density and especially onset potential or overpotential, as the key parameters for evaluating electrocatalytic performance, are problematic metrics when electron-consuming side processes can take place. This includes widely studied oxygen evolution reaction (OER), which is often accompanied by anodic currents associated with activation degradation of catalyst and/or support. Herein, we use an online chip-based electrochemistry–mass spectrometry (chip EC-MS) system to...
CO reduction studies over nanostructured copper catalysts are hindered by copper's instability in alkaline conditions, which results dissolution during immersion into the electrolyte, leading to ill-defined catalyst morphologies and loadings. Immersing under potential control can alleviate this problem, but an experimental approach for cells generally used experiments is lacking. We demonstrate that using auxiliary electrochemical cell, electrodes be introduced these kinds of reactors....
The electrochemical synthesis of nitrogen-containing molecules from biomass-derived compounds under ambient conditions is demonstrated, relying only on green sources feedstock, renewable energy, and water. In this study, we report a two-step method electrochemically synthesizing 5-(aminomethyl)furan-2-carboxylic acid (AFCA) 5-hydroxymethylfurfural (HMF) using hydroxylamine (NH2OH) as the nitrogen source in an acidic electrolyte. first step, HMF was reductively aminated into...
On important electrocatalysts including ruthenium and copper, increasing the potential pushes adsorbed hydrogen off as H<sub>2</sub>, an unexpected uphill desorption.
The rapid uptake of lithium ion batteries (LIBs) for large scale electric vehicle and energy storage applications requires a deeper understanding the degradation mechanisms. Capacity fade is due to complex interplay between phase transitions, electrolyte decomposition transition metal dissolution; many these poorly understood parasitic reactions evolve gases as side product. Here we present an on-chip electrochemistry mass spectrometry method that enables ultra-sensitive, fully quantified...
Selective partial oxidation of hydrocarbons to oxygenates plays a large role in the chemical industry, while falling prices for electricity from renewable sources make electrification such industrial processes relevant. The propene is an interesting model system as can be oxidized two different positions, allowing insights into reaction mechanism. On Pd, layer adsorbates formed situ governs by steering reactant adsorption achieve high selectivity allyl oxidation, albeit largely inhibiting...
State-of-the-art proton exchange membrane (PEM) electrolysers employ iridium-based catalysts to facilitate oxygen evolution at the anode. To enable scale-up of technology terawatt level, further improvements in iridium utilisation are needed, without incurring additional overpotential losses or reducing device lifetime. The research community has only recently started attempt systematic benchmarking catalyst stability. Short term electrochemical methods alone insufficient predict...
Part I () introduced state-of-the-art proton exchange membrane (PEM) electrolysers with iridium-based catalysts for oxygen evolution at the anode in green hydrogen applications. Aqueous model systems and full cell testing were discussed along water electrolyser (PEMWE) catalyst degradation mechanisms, types of iridium oxide, mechanisms dissolution stability studies. In II, we highlight considerations best practices investigation activity via short term testing.
Abstract A major challenge in the electrochemical oxidation of hydrocarbons is understanding formation intermediate species, some which continue to react, while others are non‐reactive or poisonous species that block adsorption further reactants. Herein we investigate identity and behavior adsorbates formed during partial propene. We employ two techniques: Electrochemistry‐Mass Spectrometry (EC‐MS) Attenuated Total Reflection Infrared Spectroscopy (ATR‐FTIR). In both cases, use CO as a probe...