A5084927510- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- Electrochemical Analysis and Applications
- Copper-based nanomaterials and applications
- Integrated Energy Systems Optimization
- Advanced Memory and Neural Computing
- Building Energy and Comfort Optimization
- Semiconductor materials and devices
- Geothermal Energy Systems and Applications
- Advanced battery technologies research
- Advanced Chemical Physics Studies
- Catalysis and Oxidation Reactions
- Surface and Thin Film Phenomena
- Gas Sensing Nanomaterials and Sensors
- Advanced Photocatalysis Techniques
- Wood Treatment and Properties
- Anodic Oxide Films and Nanostructures
- Renewable energy and sustainable power systems
- Tree Root and Stability Studies
- Plant Water Relations and Carbon Dynamics
- Electron and X-Ray Spectroscopy Techniques
- Transition Metal Oxide Nanomaterials
- Electronic and Structural Properties of Oxides
Danish Technological Institute
2019-2023
Aarhus University
2015-2021
Abstract Transition metal oxides show great promise as Earth-abundant catalysts for the oxygen evolution reaction in electrochemical water splitting. However, progress development of highly active oxide nanostructures is hampered by a lack knowledge location and nature sites. Here we show, through atom-resolved scanning tunnelling microscopy, X-ray spectroscopy computational modelling, how hydroxyls form from dissociation at under coordinated cobalt edge sites nanoislands. Surprisingly, find...
The catalytic synergy between cobalt oxide and gold leads to strong promotion of the oxygen evolution reaction (OER)-one half-reaction electrochemical water splitting. However, mechanism behind enhancement effect is still not understood, in part due a missing structural model active interface. Using novel interplay cyclic voltammetry (CV) for electrochemistry integrated with scanning tunneling microscopy (STM) X-ray photoelectron spectroscopy (XPS) on an atomically defined oxide/Au(111)...
Layered cobalt oxides have been shown to be highly active catalysts for the oxygen evolution reaction (OER; half of catalytic "water splitting" reaction), particularly when promoted with gold. However, surface chemistry and in particular nature synergistic effect gold contact are only understood on a rudimentary level, which at present prevents further exploration. We synthesized model system flat, layered oxide nanoislands supported single crystal (111) substrate. By using combination...
The addition of iron (Fe) can in certain cases have a strong positive effect on the activity cobalt and nickel oxide nanoparticles electrocatalytic oxygen evolution reaction (OER). reported optimal Fe dopant concentrations are, however, inconsistent, origin increased due to dopants mixed oxides has not been identified so far. Here, we combine density functional theory calculations, scanning tunneling microscopy, OER measurements atomically defined Fe-doped Co oxyhydroxide supported gold...
Synthesis and characterization of layered cobalt oxides for model studies electrochemical water splitting catalysts.
Well-characterized metal oxides supported on single crystal surfaces serve as valuable model systems to study fundamental chemical properties and reaction mechanisms in heterogeneous catalysis or new thin film oxide catalysts their own right. Here, we present scanning tunneling microscopy X-ray photoelectron spectroscopy results for cobalt nanoislands that reveal the detailed atomistic leading transitions between Co-O bilayer O-Co-O trilayer, induced by oxidation O2 reductive vacuum...
Abstract The catalytic synergy between cobalt oxide and gold leads to strong promotion of the oxygen evolution reaction (OER)—one half‐reaction electrochemical water splitting. However, mechanism behind enhancement effect is still not understood, in part due a missing structural model active interface. Using novel interplay cyclic voltammetry (CV) for electrochemistry integrated with scanning tunneling microscopy (STM) X‐ray photoelectron spectroscopy (XPS) on an atomically defined...
Cobalt oxide is a promising earth-abundant electrocatalyst for water splitting; however, the structural complexity of oxides coupled with difficulty characterizing it in its operating environment means that fundamental understanding catalytic properties remains poor. In this study, we go beyond vacuum studies and investigate morphological evolution CoOx/Au(111) model system from intermediate to high pressures H2O vapor by scanning tunneling microscopy near-ambient pressure X-ray...
Mixed metal oxides of earth-abundant 3d transition metals are an interesting class materials that show magnetic properties and a significant synergistic effect as catalysts for electrochemical oxygen evolution compared to simple unary oxides. However, the exact atomic-scale nature such mixed oxide phases link their physico-chemical poorly understood. Here, combination scanning tunneling microscopy x-ray photoemission spectroscopy reveals Fe species embed in facile way into CoO bilayers on...
The combination of noble Pt group metals and reducible metal oxides has been extensively studied demonstrated to display superior catalytic properties in low-temperature CO oxidation or preferential reactions. Here, we investigate CoOx films nanoislands on Pt(111) as inverse model catalysts for oxidation, order shed light the nature O species that participate oxidation. Through temperature-programmed desorption, scanning tunneling microscopy, X-ray photoelectron spectroscopy carefully...
A set-up has been established to calibrate wood-moisture meters at Danish Technological Institute. The is based on humidification of wood in an atmosphere with constant humidity, generated by saturated salt solutions. measurements the reference value are made means loss-on-drying method and traceable a primary standard for moisture mass fraction under EMRP project METefnet 2015. facility was accredited Accreditation Fund, DANAK, 2018. In this paper, we report design calibration set-up,...