Steffen Oswald
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View article: Electron Spectroscopic Investigations of Alkaline‐Based Battery‐Relevant Reference Materials
Electron Spectroscopic Investigations of Alkaline‐Based Battery‐Relevant Reference Materials Open
Electron spectroscopy with X‐ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) plays an important role for the characterization of chemical processes occurring in batteries. The interpretation of chemical species i…
View article: Electron spectroscopy investigations of potassium and potassium-intercalated graphite with battery background
Electron spectroscopy investigations of potassium and potassium-intercalated graphite with battery background Open
The potassium-based battery is a candidate for application in large-scale energy storage systems. However, the high reactivity of potassium causes big challenges and aggravates a detailed analysis of chemical processes in such batteries. F…
View article: Single “Swiss-roll” microelectrode elucidates the critical role of iron substitution in conversion-type oxides
Single “Swiss-roll” microelectrode elucidates the critical role of iron substitution in conversion-type oxides Open
Advancing the lithium-ion battery technology requires the understanding of electrochemical processes in electrode materials with high resolution, accuracy, and sensitivity. However, most techniques today are limited by their inability to s…
View article: Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties
Novel Corrosion‐Resistant Tool Steels with Superior Wear Properties Open
This work presents the novel high‐strength cast steels Fe81Cr15Mo1V2C1 and Fe80Cr15Mo1V3C1 (wt%) with high resistance against abrasion and acid corrosion. By means of a tailored alloy design and a special casting technique, implying high s…
Auger- and X-ray Photoelectron Spectroscopy at Metallic Li Material: Chemical Shifts Related to Sample Preparation, Gas Atmosphere, and Ion and Electron Beam Effects Open
Li-based batteries are a key element in reaching a sustainable energy economy in the near future. The understanding of the very complex electrochemical processes is necessary for the optimization of their performance. X-ray photoelectron s…
MOF‐Derived Onion‐Like Carbon with Superior Surface Area and Porosity for High Performance Lithium‐Ion Capacitors Open
Lithium‐ion capacitors (LICs), potentially bring together the advantages of batteries and supercapacitors. For the faradaic anodes, nanostructured carbonaceous materials hold immense potential, in contrast to graphite where limitations in …
View article: Study of TiAl thin films on piezoelectric CTGS substrates as an alternative metallization system for high-temperature SAW devices
Study of TiAl thin films on piezoelectric CTGS substrates as an alternative metallization system for high-temperature SAW devices Open
Ti/Al multilayer films with a total thickness of 200 nm were deposited on the high-temperature (HT) stable piezoelectric Ca3TaGa3Si2O14 (CTGS) as well as on thermally oxidized Si (SiO2/Si) reference substrates. The Ti–Al films were charact…
Bone Formation: Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution (Small 12/2021) Open
Transparent Ti-45Nb 3D microstructures offer an elegant way to study single bone cell-implant material interactions and pore size effects in vitro. In article number 2005527, Mariana Medina-Sánchez and co-workers present this technology as…
Rolled‐Up Metal Oxide Microscaffolds to Study Early Bone Formation at Single Cell Resolution Open
Titanium and its alloys are frequently used to replace structural components of the human body due to their high mechanical strength, low stiffness, and biocompatibility. In particular, the use of porous materials has improved implant stab…
A facile method to stabilize sodium metal anodes towards high-performance sodium batteries Open
Protected Na anodes fabricated by 1,3-dioxolane pretreatment showed long-term cycling in symmetric cells and improved electrochemical performance in full cells.
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The 18th European Conference on Applications of Surface and Interface Analysis Open
The 18th European Conference on Applications of Surface and Interface Analysis (ECASIA'19) was held in the International Congress Center of Dresden, Germany, from 15 to 20 September 2019. It was the third time ECASIA was organized in Germa…
TiNb<sub>2</sub>O<sub>7</sub> and VNb<sub>9</sub>O<sub>25</sub> of ReO<sub>3</sub> Type in Hybrid Mg–Li Batteries: Electrochemical and Interfacial Insights Open
As one of the beyond-lithium battery concepts, hybrid metal-ion batteries have aroused growing interest. Here, TiNb2O7 (TNO) and VNb9O25 (VNO) materials were prepared using a high-temperature solid-state synthesis and, for the first time, …
Directly Anodized Sulfur-Doped TiO2 Nanotubes as Improved Anodes for Li-ion Batteries Open
TiO2 represents one of the promising anode materials for lithium ion batteries due to its high thermal and chemical stability, relatively high theoretical specific capacity and low cost. However, the electrochemical performance, particular…
In-Depth Study of Li<sub>4</sub>Ti<sub>5</sub>O<sub>12</sub> Performing beyond Conventional Operating Conditions Open
Lithium-ion batteries (LIBs) are nowadays widely used in many energy storage devices, which have certain requirements on size, weight, and performance. State-of-the-art LIBs operate very reliably and with good performance under restricted …
Effects of Promoter on Structural and Surface Properties of Zirconium Oxide-Based Catalyst Materials Open
Ternary mixed oxide systems CuO/ZnO/ZrO2 and CuO/NiO/ZrO2 were synthesized by one-pot synthesis for a better understanding of the synthesis-property relationships of zirconium oxide-based catalyst materials. The prepared mixed oxide sample…
XPS chemical state analysis of sputter depth profiling measurements for annealed TiAl‐SiO <sub>2</sub> and TiAl‐W layer stacks Open
For the application of surface acoustic wave sensors at high temperatures, both a high‐temperature stable piezoelectric substrate and a suitable metallization for the electrodes are needed. Our current attempt is to use TiAl thin films as …
Phase Formation and High-Temperature Stability of Very Thin Co-Sputtered Ti-Al and Multilayered Ti/Al Films on Thermally Oxidized Si Substrates Open
Ti-Al thin films with a thickness of 200 nm were prepared either by co-sputtering from elemental Ti and Al targets or as Ti/Al multilayers with 10 and 20 nm individual layer thickness on thermally oxidized Si substrates. Some of the films …
Quasi-2D Co<sub>3</sub>O<sub>4</sub> nanoflakes as an efficient gas sensor <i>versus</i> alcohol VOCs Open
Bottom-up synthesized quasi-2D Co3O4 nanoflakes demonstrate a remarkable chemiresistive response towards chemically akin alcohol vapors in a mixture with air.
A High‐Voltage, Dendrite‐Free, and Durable Zn–Graphite Battery Open
The intrinsic advantages of metallic Zn, like high theoretical capacity (820 mAh g −1 ), high abundance, low toxicity, and high safety have driven the recent booming development of rechargeable Zn batteries. However, the lack of high‐volta…
Chromium Trihalides Cr<i>X</i><sub>3</sub> (<i>X</i> = Cl, Br, I): Direct Deposition of Micro‐ and Nanosheets on Substrates by Chemical Vapor Transport Open
The experimental observation of intrinsic ferromagnetism in single layered chromium trihalides Cr X 3 ( X = Cl, Br, I) has gained outstanding attention recently due to their possible implementation in spintronic devices. However, the repro…
Mo-La2O3 Multilayer Metallization Systems for High Temperature Surface Acoustic Wave Sensor Devices Open
Developing advanced thin film materials is the key challenge in high-temperature applications of surface acoustic wave sensor devices. One hundred nanometer thick (Mo-La 2 O 3 ) multilayer systems were fabricated at room temperature on the…
Tailor-made nanostructures bridging chaos and order for highly efficient white organic light-emitting diodes Open
Organic light-emitting diodes (OLEDs) suffer from notorious light trapping, resulting in only moderate external quantum efficiencies. Here, we report a facile, scalable, lithography-free method to generate controllable nanostructures with …
Chloroform–nitrogen aggregates: Upshifted CH and downshifted CCl stretching vibrations observed by matrix isolation and jet expansion infrared spectroscopy Open
Aggregates of chloroform with nitrogen are studied by broad band Fourier transform infrared spectroscopy in neon, argon and nitrogen cryomatrices as well as supersonic jet expansions. The CH stretching vibration v1 shows spectral blue-shif…