Tom Regier
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View article: Embedding Reverse Electron Transfer Between Stably Bare Cu Nanoparticles and Cation‐Vacancy CuWO<sub>4</sub>
Embedding Reverse Electron Transfer Between Stably Bare Cu Nanoparticles and Cation‐Vacancy CuWO<sub>4</sub> Open
Cu nanoparticles (NPs) have attracted widespread attention in electronics, energy, and catalysis. However, conventionally synthesized Cu NPs face some challenges such as surface passivation and agglomeration in applications, which impairs …
View article: Micro-Scale Mapping of Soil Organic Carbon: The Potential of Soft X-Ray Spectromicroscopy
Micro-Scale Mapping of Soil Organic Carbon: The Potential of Soft X-Ray Spectromicroscopy Open
Soil organic carbon (SOC) plays a crucial role in soil fertility, productivity, and global carbon cycling. However, the mechanisms governing SOC persistence and turnover are not fully understood, hindering effective carbon management strat…
View article: Micro-Scale Mapping of Soil Organic Carbon: The Potential of Soft X-Ray Spectromicroscopy
Micro-Scale Mapping of Soil Organic Carbon: The Potential of Soft X-Ray Spectromicroscopy Open
Soil organic carbon (SOC) plays a crucial role in soil fertility, productivity, and global carbon cycling. However, the mechanisms governing SOC persistence and turnover are not fully understood, hindering effective carbon management strat…
View article: Dissolved organic matter concentration, molecular composition, and functional groups in contrasting management practices of peatlands
Dissolved organic matter concentration, molecular composition, and functional groups in contrasting management practices of peatlands Open
About 91,300 ha of peatlands has been rewetted in western Europe since the mid‐1990s. Still, it is unknown how long‐term rewetting alters the dissolved organic matter (DOM) concentration, molecular composition, and functional groups. We ex…
View article: Experimental determination of superexchange energy from two-hole spectra
Experimental determination of superexchange energy from two-hole spectra Open
We follow the evolution of Copper and Oxygen two-hole excitations, in optimally doped (Ca$_{x}$La$_{1-x}$)(Ba$_{1.75-x}$La$_{0.25+x} $)Cu$_{3}$O$_{y}$ for $x=0.1$ and $x=0.4$. The spectra have contributions from band states as well as a lo…
View article: Evidence for bond-disproportionation in LiNiO2 from x-ray absorption spectroscopy
Evidence for bond-disproportionation in LiNiO2 from x-ray absorption spectroscopy Open
The electronic structure of LiNiO$_2$, a promising Li-ion battery cathode material, has remained a challenge to understand due to its highly covalent yet correlated nature. Here we elucidate the electronic structure in LiNiO$_2$ and the re…
View article: Graphitic‐shell encapsulated FeNi alloy/nitride nanocrystals on biomass‐derived N‐doped carbon as an efficient electrocatalyst for rechargeable Zn‐air battery
Graphitic‐shell encapsulated FeNi alloy/nitride nanocrystals on biomass‐derived N‐doped carbon as an efficient electrocatalyst for rechargeable Zn‐air battery Open
Oxygen reduction/evolution reactions (ORR/OERs) catalysts play a key role in the metal‐air battery and water‐splitting process. Herein, we developed a facile template‐free method to fabricate a new type of non–noble metal‐based hybrid cata…
View article: Nitrogen speciation and transformations in fire-derived organic matter
Nitrogen speciation and transformations in fire-derived organic matter Open
Vegetation fires are known to have broad geochemical effects on carbon (C) cycles in the Earth system, yet limited information is available for nitrogen (N). In this study, we evaluated how charring organic matter (OM) to pyrogenic OM (PyO…
View article: High-energy and high-power Zn–Ni flow batteries with semi-solid electrodes
High-energy and high-power Zn–Ni flow batteries with semi-solid electrodes Open
Careful rheological design and electrochemical optimization of conductive ZnO and Ni(OH)2 active semi-solid flowable electrodes is essential to achieve a high-energy and high-power Zn–Ni flow battery.
View article: Structure and composition of surface depletion layers in poled aluminosilicate glasses
Structure and composition of surface depletion layers in poled aluminosilicate glasses Open
Thermal poling processes can be used to form modified surface layers on glass that, under ion‐blocking electrode conditions, are depleted of virtually all network‐modifying cations relative to the network‐forming species. During this proce…
View article: Correlative Spectromicroscopy Software Development on the SGM and Mid-IR Beamlines at the CLS
Correlative Spectromicroscopy Software Development on the SGM and Mid-IR Beamlines at the CLS Open
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View article: Redox Processes of Manganese Oxide in Catalyzing Oxygen Evolution and Reduction: An <i>in Situ</i> Soft X-ray Absorption Spectroscopy Study
Redox Processes of Manganese Oxide in Catalyzing Oxygen Evolution and Reduction: An <i>in Situ</i> Soft X-ray Absorption Spectroscopy Study Open
Manganese oxides with rich redox chemistry have been widely used in (electro)catalysis in applications of energy and environmental consequence. While they are ubiquitous in catalyzing the oxygen evolution reaction (OER) and oxygen reductio…
View article: Low background, UHV compatible scintillator detector for the CLS cryo scanning soft X-ray microscope
Low background, UHV compatible scintillator detector for the CLS cryo scanning soft X-ray microscope Open
A new soft X-ray scanning transmission X-ray microscope (STXM) optimized for cryo spectro-tomography was designed and commissioned at the Canadian Light Source (CLS). The instrument was required to achieve ultra high vacuum and be compatib…
View article: Retention Mechanisms of Citric Acid in Ternary Kaolinite-Fe(III)-Citrate Acid Systems Using Fe K-edge EXAFS and L3,2-edge XANES Spectroscopy
Retention Mechanisms of Citric Acid in Ternary Kaolinite-Fe(III)-Citrate Acid Systems Using Fe K-edge EXAFS and L3,2-edge XANES Spectroscopy Open
Organic carbon (OC) stability in tropical soils is strongly interlinked with multivalent cation interaction and mineral association. Low molecular weight organic acids (LMWOAs) represent the readily biodegradable OC. Therefore, investigati…
View article: Homogeneously dispersed multimetal oxygen-evolving catalysts
Homogeneously dispersed multimetal oxygen-evolving catalysts Open
Modulating metal oxides The more difficult step in fuel cells and water electrolysis is the oxygen evolution reaction. The search for earth-abundant materials to replace noble metals for this reaction often turns to oxides of three-dimensi…
View article: Bulk sensitive determination of the Fe<sup>3+</sup>/Fe<sub>Tot</sub>-ratio in minerals by Fe L<sub>2/3</sub>-edge X-ray Raman scattering
Bulk sensitive determination of the Fe<sup>3+</sup>/Fe<sub>Tot</sub>-ratio in minerals by Fe L<sub>2/3</sub>-edge X-ray Raman scattering Open
We use X-ray Raman scattering spectroscopy of the Fe L2/3-edge of FeO, Fe2O3, and Fe3O4at ambient and of FeCO3at high pressure conditions to extract the Fe3+/FeTot-ratio..