Armin Siebel
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View article: Ex situ/Operando X‐Ray Absorption Spectroscopy on Fe<sub>0.07</sub>Zr<sub>0.93</sub>O<sub>2‐δ</sub>/C vs. Fe−N−C as Pt‐Group‐Metal‐Free Oxygen Reduction Reaction Catalysts in Proton Exchange Membrane Fuel Cells
Ex situ/Operando X‐Ray Absorption Spectroscopy on Fe<sub>0.07</sub>Zr<sub>0.93</sub>O<sub>2‐δ</sub>/C vs. Fe−N−C as Pt‐Group‐Metal‐Free Oxygen Reduction Reaction Catalysts in Proton Exchange Membrane Fuel Cells Open
In this study, ex situ and operando X‐ray absorption spectroscopy (XAS) is employed to shed light on structure and degradation mechanism of Fe‐based catalysts for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (…
View article: A Platinum Micro-Reference Electrode for Impedance Measurements in a PEM Water Electrolysis Cell
A Platinum Micro-Reference Electrode for Impedance Measurements in a PEM Water Electrolysis Cell Open
We present a platinum wire micro-reference electrode (Pt-WRE) suitable for recording individual electrochemical impedance spectra of both the anode and the cathode in a proton exchange membrane water electrolyzer (PEM-WE). For this purpose…
View article: Nanometric Fe-Substituted ZrO<sub>2</sub>on Carbon Black as PGM-Free ORR Catalyst for PEMFCs
Nanometric Fe-Substituted ZrO<sub>2</sub>on Carbon Black as PGM-Free ORR Catalyst for PEMFCs Open
In this contribution, we demonstrate the presence of high-spin Fe3+ in Fe-substituted ZrO2 (FexZr1−xO2−δ), as deduced from X-ray photoelectron spectroscopy (XPS), near-edge X-ray absorption fine structure (NEXAFS), and 57Fe Mössbauer spect…
View article: Impact of Intermittent Operation on Lifetime and Performance of a PEM Water Electrolyzer
Impact of Intermittent Operation on Lifetime and Performance of a PEM Water Electrolyzer Open
The aim of this study is to provide a better understanding of performance degrading mechanisms occurring when a proton exchange membrane water electrolyzer (PEM-WE) is coupled with renewable energies, where times of operation and idle peri…
View article: Insights into the Interconnection of the Electrodes and Electrolyte Species in Lithium–Sulfur Batteries Using Spatially Resolved <i>Operando</i> X-ray Absorption Spectroscopy and X-ray Fluorescence Mapping
Insights into the Interconnection of the Electrodes and Electrolyte Species in Lithium–Sulfur Batteries Using Spatially Resolved <i>Operando</i> X-ray Absorption Spectroscopy and X-ray Fluorescence Mapping Open
The lithium–sulfur (Li–S) battery chemistry has attracted great interest in the last decade because of its outstanding theoretical gravimetric energy density compared to the state-of-the-art lithium-ion battery technology. However, practic…
View article: The Importance of Chemical Reactions in the Charging Process of Lithium-Sulfur Batteries
The Importance of Chemical Reactions in the Charging Process of Lithium-Sulfur Batteries Open
The underlying mechanism of lithium-sulfur batteries is still not fully established because it involves a series of both chemical and electrochemical reactions as well as the formation of soluble polysulfide intermediates. To improve the m…
View article: Analysis of Voltage Losses in PEM Water Electrolyzers with Low Platinum Group Metal Loadings
Analysis of Voltage Losses in PEM Water Electrolyzers with Low Platinum Group Metal Loadings Open
In this study, the influence of catalyst loading on the performance of a proton exchange membrane (PEM) water electrolyzer is investigated (Nafion 212 membrane; IrO2/TiO2 (anode) and Pt/C (cathode)). Due to the fast kinetics of the hydroge…
View article: ADV volume 2 issue 8 Cover and Front matter
ADV volume 2 issue 8 Cover and Front matter Open
View article: Operando Characterization of Intermediates Produced in a Lithium-Sulfur Battery
Operando Characterization of Intermediates Produced in a Lithium-Sulfur Battery Open
One of the technological barriers to electrification of transport is the insufficient storage capacity of the Li-ion batteries on which the current electric cars are based. The lithium-sulfur (Li-S) battery is an advanced technology whose …