Georg Held
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View article: Lowering the Cu-O bond energy in CuO nanocatalysts enhances the efficiency of NH3 oxidation
Lowering the Cu-O bond energy in CuO nanocatalysts enhances the efficiency of NH3 oxidation Open
Tuning the electronic properties of nanocatalysts via doping with monodispersed hetero-metal atoms is an effective method used to enhance catalytic properties. Doping CuO nanoparticles with monodispersed Co atoms using different reductants…
View article: ZnO Nanostars Decorated with Mass-Selected Au Clusters for Photoluminescence
ZnO Nanostars Decorated with Mass-Selected Au Clusters for Photoluminescence Open
Hybrid nanostructures combining semiconductor materials and noble metal clusters of atoms (nanoparticles) are of high interest in the energy sector and catalysis, with the idea of tuning the physicochemical properties of the system toward …
View article: Key Role of Oxidising Species Driving Water Oxidation Revealed by Time Resolved Optical and X-ray Spectroscopies
Key Role of Oxidising Species Driving Water Oxidation Revealed by Time Resolved Optical and X-ray Spectroscopies Open
Oxidation states underpin the understanding of active states, reaction mechanisms, and catalytic performance of electrocatalysts. However, determining them—and the underlying physicochemical nature they reflect—at complex solid/liquid inte…
View article: An automated and robust method for modelling X-ray beamlines with plane grating monochromators
An automated and robust method for modelling X-ray beamlines with plane grating monochromators Open
The plane grating monochromator (PGM) is an optical instrument used in the majority of soft X-ray beamlines. Despite its ubiquity, the PGM efficiency can easily be overestimated, because the geometry of many modern PGMs can lead to unexpec…
View article: Synthesis optimization, adsorption properties and spectroscopic investigation of an NH<sub>2</sub>-tagged Cu-based MOF with open metal sites
Synthesis optimization, adsorption properties and spectroscopic investigation of an NH<sub>2</sub>-tagged Cu-based MOF with open metal sites Open
Rapid microwave-assisted solvothermal synthesis of a Cu–MOF (metal–organic framework) enables the formation of open metal sites of different natures and CO 2 sorption energetics.
View article: Operando XPS and NEXAFS to link the OER mechanism with the fast electro-oxidation of organic pollutants on a porous NiMnO <sub>3</sub> –rGO anode
Operando XPS and NEXAFS to link the OER mechanism with the fast electro-oxidation of organic pollutants on a porous NiMnO <sub>3</sub> –rGO anode Open
Electro-oxidation is one of the most promising and eco-friendly technologies for water decontamination.
View article: Operando Characterization of Electrochemistry at the Rutile TiO<sub>2</sub>(110)/0.1 M HCl Interface Using Ambient Pressure XPS
Operando Characterization of Electrochemistry at the Rutile TiO<sub>2</sub>(110)/0.1 M HCl Interface Using Ambient Pressure XPS Open
Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) was employed to investigate the effect of applied potential on the interface of TiO2(110) with 0.1 M HCl. The study, which involved operando electrochemical characterization, enabl…
View article: Atomic structure of different surface terminations of polycrystalline ZnPd
Atomic structure of different surface terminations of polycrystalline ZnPd Open
The intermetallic compound ZnPd has been found to have desirable characteristics as a catalyst for the steam reforming of methanol. The understanding of the surface structure of ZnPd is important to optimize its catalytic behavior. However…
View article: Correction to “Interfacial Chemistry in the Electrocatalytic Hydrogenation of CO<sub>2</sub> over C-Supported Cu-Based Systems”
Correction to “Interfacial Chemistry in the Electrocatalytic Hydrogenation of CO<sub>2</sub> over C-Supported Cu-Based Systems” Open
[This corrects the article DOI: 10.1021/acscatal.3c01288.].
View article: Effects of Phosphorus Doping on Amorphous Boron Nitride’s Chemical, Sorptive, Optoelectronic, and Photocatalytic Properties
Effects of Phosphorus Doping on Amorphous Boron Nitride’s Chemical, Sorptive, Optoelectronic, and Photocatalytic Properties Open
Amorphous porous boron nitride (BN) represents a versatile material platform with potential applications in adsorptive molecular separations and gas storage, as well as heterogeneous and photo-catalysis. Chemical doping can help tailor BN'…
View article: Subsurface Single‐Atom Catalyst Enabled by Mechanochemical Synthesis for Oxidation Chemistry
Subsurface Single‐Atom Catalyst Enabled by Mechanochemical Synthesis for Oxidation Chemistry Open
Single‐atom catalysts have garnered significant attention due to their exceptional atom utilization and unique properties. However, the practical application of these catalysts is often impeded by challenges such as sintering‐induced insta…
View article: Subsurface Single‐Atom Catalyst Enabled by Mechanochemical Synthesis for Oxidation Chemistry
Subsurface Single‐Atom Catalyst Enabled by Mechanochemical Synthesis for Oxidation Chemistry Open
Single‐atom catalysts have garnered significant attention due to their exceptional atom utilization and unique properties. However, the practical application of these catalysts is often impeded by challenges such as sintering‐induced insta…
View article: Atomistic Insights Into the Surface Dynamics of Ni(111) During Reverse Water gas Shift Reaction
Atomistic Insights Into the Surface Dynamics of Ni(111) During Reverse Water gas Shift Reaction Open
The conversion of CO 2 ‐H 2 mixtures on Ni‐based catalysts can proceed through either the reverse water gas shift reaction (RWGS) path to produce CO or the CO 2 methanation path to produce CH 4 . The balance between these competing reactio…
View article: An electrochemical flow cell for operando XPS and NEXAFS investigation of solid–liquid interfaces
An electrochemical flow cell for operando XPS and NEXAFS investigation of solid–liquid interfaces Open
Suitable reaction cells are critical for operando near ambient pressure (NAP) soft x-ray photoelectron spectroscopy (XPS) and near-edge x-ray absorption fine structure (NEXAFS) studies. They enable tracking the chemical state and structura…
View article: Removal and Reoccurrence of LLZTO Surface Contaminants under Glovebox Conditions
Removal and Reoccurrence of LLZTO Surface Contaminants under Glovebox Conditions Open
The reactivity of Li6.4La3Zr1.4Ta0.6O12 (LLZTO) solid electrolytes to form lithio-phobic species such as Li2CO3 on their surface when exposed to trace amounts of H2O and CO2 limits the progress of LLZTO-based solid-state batteries. Various…
View article: In Situ Formation of Suspended Graphene Windows for Lab‐Based XPS in Liquid and Gas Environments
In Situ Formation of Suspended Graphene Windows for Lab‐Based XPS in Liquid and Gas Environments Open
Environmental cells sealed with photoelectron‐transparent graphene windows are promising for extending X‐ray photoelectron spectroscopy (XPS) to liquid and high‐pressure gas environments for in situ and operando studies. However, the relia…
View article: Overcoming the Trade-Off between Methanol Rejection and Proton Conductivity via Facile Synthesis of Crosslinked Sulfonated PEEK Proton Exchange Membranes
Overcoming the Trade-Off between Methanol Rejection and Proton Conductivity via Facile Synthesis of Crosslinked Sulfonated PEEK Proton Exchange Membranes Open
In this work, homogeneous, thin-film proton exchange membranes (PEMs) with superior proton conductivities and high methanol rejection were fabricated via a facile synthesis procedure. Sulfonated polyether ether ketone (sPEEK) was crosslink…
View article: VerSoX B07-B: a high-throughput XPS and ambient pressure NEXAFS beamline at Diamond Light Source
VerSoX B07-B: a high-throughput XPS and ambient pressure NEXAFS beamline at Diamond Light Source Open
The beamline optics and endstations at branch B of the Versatile Soft X-ray (VerSoX) beamline B07 at Diamond Light Source are described. B07-B provides medium-flux X-rays in the range 45–2200 eV from a bending magnet source, giving access …
View article: Photocatalytic CO<sub>2</sub> reduction to syngas using nickel phosphide-loaded CdS under visible light irradiation
Photocatalytic CO<sub>2</sub> reduction to syngas using nickel phosphide-loaded CdS under visible light irradiation Open
Photocatalytic CO 2 reduction is a sustainable pathway to produce syngas (H 2 + CO), which is a key feedstock for the production of several important liquid fuels on the industrial scale. However, achieving an appropriate tunable ratio of …
View article: Electrolyte-assisted polarization leading to enhanced charge separation and solar-to-hydrogen conversion efficiency of seawater splitting
Electrolyte-assisted polarization leading to enhanced charge separation and solar-to-hydrogen conversion efficiency of seawater splitting Open
Photocatalytic splitting of seawater for hydrogen evolution has attracted a great deal of attention in recent years. However, the poor energy conversion efficiency and stability of photocatalysts in a salty environment have greatly hindere…
View article: Spinel ferrites MFe<sub>2</sub>O<sub>4</sub> (M = Co, Cu, Zn) for photocatalysis: theoretical and experimental insights
Spinel ferrites MFe<sub>2</sub>O<sub>4</sub> (M = Co, Cu, Zn) for photocatalysis: theoretical and experimental insights Open
DFT simulations and synchrotron experiments offer new insights on the interplay between surface and bulk properties in spinel ferrites.
View article: Synthesis of Pt decorated manganese oxide (MnO2/Mn5O8) nanorods and their catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol
Synthesis of Pt decorated manganese oxide (MnO2/Mn5O8) nanorods and their catalytic activity for the reduction of 4-nitrophenol to 4-aminophenol Open
α-MnO2 nanorods (NRs) were synthesized by microwave irradiation and used as supports for platinum nanoparticles by wet impregnation with Pt(acac)2 as precursor. XRD analysis revealed that the samples without platinum (sample MP0) and with …
View article: Structural Properties of PtCuO/Al2O3 surface catalyst for selective NH3 oxidation using operando spectroscopy
Structural Properties of PtCuO/Al2O3 surface catalyst for selective NH3 oxidation using operando spectroscopy Open
Selective catalytic oxidation (SCO) of NH3 to N2 is one of the most effective methods to eliminate NH3 emissions. However, achieving high conversion over a wide operating temperature range while avoiding over-oxidation to NOx is a signific…