Rafael Müller

Helmholtz-Zentrum Berlin für Materialien und Energie

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Document Type

Co-Authors

J. C. Cersósimo

University of Puerto Rico at Humacao

D. Centeno

E. Franco

Association of Research Libraries

Sebastian Risse

Helmholtz-Zentrum Berlin für Materialien und Energie

A. Köhl

Christophorus Kliniken

K. Heime

Westfälische Hochschule

Greta R. Patzke

University of Zurich

D. Cotto

André Hilger

Helmholtz-Zentrum Berlin für Materialien und Energie

Nikolay Kardjilov

Helmholtz-Zentrum Berlin für Materialien und Energie

Cooperative Institutions

RWTH Aachen University

University of Zurich

FH Aachen

Helmholtz-Zentrum Berlin für Materialien und Energie

Clinics Hospital of Ribeirão Preto

Technische Universität Berlin

University of Puerto Rico at Humacao

Forschungszentrum Jülich

Fraunhofer Institute for Material and Beam Technology

TU Dresden

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Multimodal Operando Analysis of Lithium Sulfur Multilayer Pouch Cells: An In‐Depth Investigation on Cell Component Design and Performance

Advanced Energy Materials (2025)

Rafael Müller Tom Boenke Susanne Dörfler Thomas Abendroth Paul Härtel

Abstract This study presents an innovative operando analysis of lithium‐sulfur (Li/S) multilayer pouch cells, employing a combination of lab‐source and synchrotron x‐ray imaging to investigate sulfur crystallite dissolution and lithium dendrite formation. By integrating advanced X‐ray imaging, impedance spectroscopy, and simultaneous monitoring of temperature and pressure, the research uncovers critical insights into the behavior of active and inactive cell components. The analysis reveals significant degradation increments, primarily driven by side product accumulation and the deterioration of lithium microstructures, which contribute to performance loss over cycling. Additionally, temperature distribution analysis shows a strong correlation between joule heating, polarization resistance, and the observed endothermic processes during crystallization. These findings provide a comprehensive understanding of the mechanistic processes within industrially relevant pouch cells, highlighting opportunities for optimizing Li/S cell designs and advancing high‐energy‐density battery systems for commercial applications.

Component (thermodynamics)

Pouch

10.1002/aenm.202404256

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Citations (0)

Transition Metal Carbodiimide vs. Spinel Matrices for Photocatalytic Water Oxidation

World Academy of Science, Engineering and Technology, International Journal of Chemical and Molecular Engineering (2016)

Karla Lienau Rafael Müller René Moré Debora Ressnig Dan Cook

Carbodiimide

Source

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Selective drug trace detection with low-field NMR

The Analyst (2011)

Stefan Glöggler Meike Emondts Johannes F. P. Colell Rafael Müller Bernhard Blümich

Advances with para-hydrogen induced polarization open up new fields of applications for portable low-field NMR. Here we report the possibility of tracing drugs down to the micromolar regime. We could selectively polarize nicotine quantities similar to those found in one cigarette. Also less than 1 mg of harmine, a drug used for treatment of Parkinson's disease, and morphine extracted from an opium solution were detectable after polarization with para-hydrogen in single-scan (1)H-experiments. Moreover, we demonstrate the possibility to selectively enhance and detect the (1)H-signal of drug molecules with PHIP in proton rich standard solutions that would otherwise mask the (1)H NMR signal of the drug.

Harmine

Proton NMR

Drug Detection

10.1039/c0an01048k

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Citations (49)

Observation Report 2003-2004: Humacao University Observatory

Journal of Double Star Observations (2007)

Rafael Müller J. C. Cersósimo Valmin Miranda Chaim Martinez Pedro Carrion

Source

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Obsservational Data of Binary Stars

American Astronomical Society Meeting Abstracts (2007)

Rafael Müller D. Centeno Luis A. Rivera‐Rivera K. Morales K. Ramos

Binary data

Source

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Citations (0)

Building an efficient curation workflow for the Arabidopsis literature corpus

Database (2012)

Donghui Li Tanya Berardini Rafael Müller Eva Huala

TAIR (The Arabidopsis Information Resource) is the model organism database (MOD) for Arabidopsis thaliana, a model plant with a literature corpus of about 39 000 articles in PubMed, with over 4300 new articles added in 2011. We have developed a literature curation workflow incorporating both automated and manual elements to cope with this flood of new research articles. The current workflow can be divided into two phases: article selection and curation. Structured controlled vocabularies, such as the Gene Ontology and Plant Ontology are used to capture free text information in the literature as succinct ontology-based annotations suitable for the application of computational analysis methods. We also describe our curation platform and the use of text mining tools in our workflow. Database URL: www.arabidopsis.org

Controlled vocabulary

10.1093/database/bas047

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Citations (19)

Drift Correction in Operando Electrochemical Impedance Spectroscopy for Batteries Research

Rebeca Fortes-Martín Sebastian Risse Rafael Müller

Operando Electrochemical Impedance Spectroscopy on a cycling battery involves several challenges. As the battery state is continuously changing during discharge/charge cycling, the fundamental stability criterion is not fulfilled, and certain drift of the impedance data is emerged. In the present study, an algorithm for the drift correction was developed for different sets of synthetic data. Various computational steps were followed once created a given set of impedance data: single-frequency-point hysteresis correction, time-state drift correction, regularization of the Distribution of Relaxation Times using the Levenberg-Marquardt algorithm with a penalty contribution, and validation of the resulting data by two-pole Hilbert Transform. An evaluation of the influence of hysteresis noise proved a robust algorithm for the drift corrections of operando impedance.

Hysteresis

State of charge

10.1109/iwis61214.2023.10302755

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Citations (1)

Para-hydrogen induced polarization of amino acids, peptides and deuterium–hydrogen gas

Physical Chemistry Chemical Physics (2011)

Stefan Glöggler Rafael Müller Johannes F. P. Colell Meike Emondts Martin Dabrowski

Signal Amplification by Reversible-Exchange (SABRE) is a method of hyperpolarizing substrates by polarization transfer from para-hydrogen without hydrogenation. Here, we demonstrate that this method can be applied to hyperpolarize small amounts of all proteinogenic amino acids and some chosen peptides down to the nanomole regime and can be detected in a single scan in low-magnetic fields down to 0.25 mT (10 kHz proton frequency). An outstanding feature is that depending on the chemical state of the used catalyst and the investigated amino acid or peptide, hyperpolarized hydrogen–deuterium gas is formed, which was detected with 1H and 2H NMR spectroscopy at low magnetic fields of B0 = 3.9 mT (166 kHz proton frequency) and 3.2 mT (20 kHz deuterium frequency).

Hydrogen–deuterium exchange

10.1039/c1cp20992b

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Citations (116)

Double-heterojunction lattice-matched and pseudomorphic InGaAs HEMT with delta -doped InP supply layers and p-InP barrier enhancement layer grown by LP-MOVPE

IEEE Electron Device Letters (1993)

A. Mesquida Küsters A. Köhl Rafael Müller V. Sommer K. Heime

The design and fabrication using low-pressure metalorganic vapor phase epitaxy (LP-MOVPE) of a HEMT on InP substrate that only uses InP and In/sub x/Ga/sub 1-x/As as layer materials are reported. Lattice-matched (x=0.53) and strained (x=0.68) channels and a double-heterojunction design were used in this investigation. The DC performance of the 0.8- mu m devices at 300 and 77 K was excellent for both cases. Improvements of 9 and 22% in g/sub mext/ with the strain were measured at the same temperatures, in accordance with theoretical predictions. The approach described may serve as a very useful alternative, especially in MOVPE growth, to InAlAs containing structures because it eliminates many of the troublesome effects such as kinks, deep levels, interface states, high output conductances, and gate leakage, which are to a large extent attributed to impurity-Al interactions. The use of lattice-mismatched InGaAs as channel layer increases the conduction band offset to InP, the DH structure improves both confinement and current, and the p-InP barrier layer results in sufficiently high quasi-Schottky barriers.< >

Barrier layer

Band offset

Leakage (economics)

10.1109/55.215092

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Citations (24)

Seismic Sensing in Submarine Fiber Cables

Mattia Cantono Jorge C. Castellanos Valey Kamalov Antonio Mecozzi Rafael Müller

Optical fibers are ubiquitously deployed in terrestrial and submarine networks, making them attractive for sensing activities. We review optical technologies used for seismic sensing and show results of polarization sensing experiments performed over Google's submarine cable Curie, connecting US to Chile.

Optical fiber cable

Optical sensing

Distributed Acoustic Sensing

10.1109/ecoc52684.2021.9605838

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Citations (7)