About
75
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Introduction
Götz Schuck works at the Department Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin as BESSY II station manager for KMC-2 XANES and KMC-3 CryoEXAFS. Götz does research in Experimental Physics, Materials Science and Condensed Matter Physics. He is particularly interested in basic research in the field of hybrid perovskites. You can get in touch with me at Mastodon https://fediscience.org/@GoetzSchuck
Additional affiliations
August 2012 - February 2015
EFG GmbH Berlin
Position
- Consultant
Description
- For more than 50 years the EFG company is developing and producing X-ray devices, such as diffractometers for crystal orientation measurement. The orientation of the crystal lattice is of great importance in many industrial applications of crystals.
August 2009 - June 2012
Rigaku Europe SE
Position
- XRD Senior Application Scientist
December 2005 - December 2008
Publications
Publications (75)
The analysis of the presence and content of substances that are toxic to aquatic life in waste is essential for classification of waste with regard to hazard property (HP) 14 'ecotoxic'. For the determination of HP14 classified copper (Cu) and zinc (Zn) compounds in various municipal solid waste incineration bottom ashes (IBA) and one fly ash (FA)...
Based on previously published research, the structural response of the tetragonal hybrid perovskite crystal structure of MAPbX3 [MA: [CH3NH3]+, methylammonium; X = I, Br] to thermal expansion is reviewed here. From an averaged crystal structure perspective, the tetragonal perovskite structure of MAPbI3 and MAPbBr3, based on diffraction data, shows...
The potential profile of layered oxides as cathodes for Na-ion batteries can be well tuned by cation doping. Doping typically leads to changes in the phase behavior and the redox chemistry, but the processes and design rules are often unclear, especially at potentials above approximately 4 V vs. Na+/Na. Here, we study by means of synchrotron method...
High‐performance bifunctional electrocatalysts for the oxygen reduction (ORR) and oxygen evolution reaction (OER) are essential components in energy conversion and storage technologies. Yet, their poor reversibility hinders their applicability. A highly active ORR/OER catalyst, consisting of multiwalled carbon nanotubes‐supported MnFeNiOx nanoparti...
Sodium-ion batteries have not only garnered substantial attention for grid-scale energy storage owing to the higher abundance of sodium compared with lithium, but also present the possibility of fast charging because of the inherently higher sodium-ion mobility. However, it remains a phenomenal challenge to achieve a combination of these merits, gi...
Cation doping is an effective strategy for improving the cyclability of layered oxide cathode materials through suppression of phase transitions in the high voltage region. In this study, Mg and Sc are chosen as dopants in P2‐Na0.67Ni0.33Mn0.67O2, and both have found to positively impact the cycling stability, but influence the high voltage regime...
Multi-edge EXAFS spectroscopy combined with reverse Monte Carlo (RMC) simulations was used to probe the details of element-specific local coordinations and component-dependent structure relaxations in single crystalline equiatomic CrMnFeCoNi high-entropy alloy as a function of the annealing temperature. Two representative states, namely a high-temp...
Cation doping is an effective strategy for improving the cyclability of layered oxide cathode materials through suppression of phase transitions in the high voltage region (>~4.0V). In this study we choose Mg and Sc as representative dopants in P2- Na0.67Ni0.33Mn0.67O2. While both dopants have a positive effect on the cycling stability, they are fo...
The design criteria for metal-organic frameworks (MOFs) have been established by evaluating the relationship between their key characteristics and magnesium-ion conductivity based on three types of secondary building blocks (Zn4O(CO2)6: MOF-5 and MOF-177; Cu2(CO2)4: MOF-199, MOF-143, MOF-14, and MOF-399; Cu2O2(CO2)2: Cu-MOF-74) to achieve pseudo-so...
Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effects of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing single phase CoO x and (Co 0.7 Mn 0.3 )O x films electrodeposited in alk...
The oxygen redox reaction in lithium-rich layered oxide battery cathode materials generates extra capacity at high cell voltages (i.e., >4.5 V). However, the irreversible oxygen release causes transition metal (TM) dissolution, migration and cell voltage decay. To circumvent these issues, we introduce a strategy for tuning the Coulombic interaction...
Improving the stability of electrocatalysts for the oxygen evolution reaction (OER) through materials design has received less attention than improving their catalytic activity. We explored the effect of Mn addition to a cobalt oxide for stabilizing the catalyst by comparing Na-containing CoOx and (Co0.7Mn0.3)Ox films electrodeposited in alkaline s...
The development of earth‐abundant catalysts for selective electrochemical CO2 conversion is a central challenge. CuSn bimetallic catalysts can yield selective CO2 reduction toward either CO or formate. This study presents oxide‐derived CuSn catalysts tunable for either product and seeks to understand the synergetic effects between Cu and Sn causing...
This article reports on studies of chlorine-substituted MAPbI3 using combined temperature-dependent XRD synchrotron and Pb-L3 edge EXAFS to analyze the anharmonicity of the lead halide bond. The EXAFS parameters were described in the orthorhombic phase by an Einstein or T2 type behavior, which was then compared with the experimental EXAFS parameter...
The requirements for beneficial materials restructuring into a higher performance oxygen evolution reaction (OER) electrocatalyst are still a largely open question. Here erythrite (Co3(AsO4)2·8H2O) is used as a Co‐based OER electrocatalyst to evaluate its catalytic properties during in situ restructuring into an amorphous Co‐based catalyst in four...
p>The requirements for beneficial materials restructuring into a higher performance OER electrocatalyst are still a largely open question. Here we use Erythrite (Co<sub>3</sub>(AsO<sub>4</sub>)<sub>2 </sub>8H<sub>2</sub>O) as a Co-based OER electrocatalyst to evaluate its catalytic properties during in-situ restructuring into an amorphous Co-based...
div>
In the field of electrochemical CO<sub>2</sub> conversion, the development of earth-abundant catalysts which are selective for a single product is a central challenge. Cu-Sn bimetallic catalysts have been reported to yield selective CO<sub>2 </sub>reduction towards either carbon monoxide or formate. To advance the understanding of possible sy...
Nickel-containing silicon oxycarbonitride ceramic nanocomposites are synthesized from hydrous nickel acetate and poly(vinyl)silazane (Durazane 1800) or perhydropolysilazane NN120-20 (A) (PHPS). Room temperature chemical reaction results in Ni-containing polysilazane precursors which are transformed into ceramic nanocomposites with nickel nanopartic...
Multiple-Edge Anomalous Diffraction (MEAD) has been applied to various quaternary sulfosalts belonging to the adamantine compound family in order to validate the distribution of copper, zinc and iron cations in the structure. Semiconductors from this group of materials are promising candidates for photovoltaic applications. Their properties strongl...
The Cryo-EXAFS experimental station at beamline KMC-3 is a dedicated experiment to investigate the short-range environment around selected atomic species and redox behavior in condensed matter by X-ray Absorption Spectroscopy with cryogenic or in-beam, operando electrochemistry sample conditions.
Anionic redox chemistry endows Li-rich layered oxide cathode with high specific capacity, but it also causes some critical issues such as voltage decay, structure degradation, and irreversible oxygen release. Herein, we propose to tune both the anionic and cationic redox chemistry of Li 1.2 Mn 0.6 Ni 0.2 O 2 via a "three-in-one" strategy integratin...
Manganese oxides have received much attention over the years among the wide range of electrocatalysts for the oxygen evolution reaction (OER) due to their low toxicity, high abundance and rich redox chemistry. While many previous studies focused on the activity of these materials, a better understanding of the material transformations relating to a...
As potential cathodes for sodium ion batteries, layered NaxTMO2 (0.44 ≤ x ≤ 1, TM = transition metal) materials show high specific capacities but poor cycling and rate performance. In layered NaxTMO2, the distribution of TM at crystal sites determines the electrostatic interaction between TM and the coordinated atoms and affects the electrochemical...
The effective stabilization of tannery sludge wastes is explored using X-Ray Absorption Fine Structure (XAFS) spectroscopies. Solidification of the Cr-rich waste was realized via vitrification of the incinerated sludge with silica and flux agents. It is demonstrated that the effective reduction of Cr(VI) and the structural role of Cr are strongly m...
Manganese oxides have received much attention over the years among the wide range of electrocatalysts for the oxygen evolution reaction (OER) due to their low toxicity, high abundance and rich redox chemistry. While many previous studies focused on the activity of these materials, a better understanding of the material transformations relating to a...
Designing high‐activity catalysts and revealing the in‐depth structure–property relationship is particularly important for Li–O2 batteries. Herein, the self‐boosting catalysis of LiCoO2 as an electrocatalyst for Li–O2 batteries and the investigation of its self‐adjustment mechanism using in situ X‐ray absorption spectroscopy and other operando char...
Layered NaxTMO2 (0<x≤1, TM = transition metal) materials have been extensively investigated as cathodes for sodium ion batteries. However, capacity fading during cycling hinders their practical utilization in sodium ion batteries. The capacity fading of layered NaxTMO2 materials is normally reasoned by unfavorable structural phase transitions accom...
Metal-containing (Mn, Fe, Co, Cu, Zn and Ag) polysilazane precursors are synthesized via one-step chemical reaction of metal acetates with poly(vinyl)silazane (Durazane 1800) at room temperature under argon atmosphere. The ATR-FTIR spectra of the synthesized metal-containing precursors reveal that the metal acetates used in the synthesis catalyze t...
Tuning the anionic redox chemistry (O2-→O2n-) activity and reversibility by the crystal and/or electronic modulation is essential for Li-rich oxides cathode materials. Herein, we report a facile strategy to improve the activity and reversibility of both anionic and cationic redox by integrating oxygen vacancies and spinel phase. The initial specifi...
The poor cycling performance and storage instability of Ni-rich layered oxide cathode materials seriously restrict their practical application. Herein, we report to improve the cycling and air-storage stability of LiNi0.8Co0.1Mn0.1O2 through an integrated surface/interface/doping engineering. The capacity retention after 500 cycles at 5C is largely...
O3-type NaTMO2 (TM = transition metal) as cathodes for Na-ion batteries have aroused much interest. But the structural instability during charge-discharge cycles and the inferior rate capability restricts their application. In this study, we report a synergetic modification method to simultaneously increase the rate capacity and cycling stability o...
O3-type layered transition metal oxides have been considered as the promising cathode candidates for sodium-ion batteries (SIBs) due to its high theoretical capacity. However, they generally suffer from critical issues like poor rate capability and inferior cycling stability. Herein, an O3-type NaNi0.5Mn0.5O2 hollow microbars with exposed {0 1 0} f...
The hybrid halide perovskites MAPbI3, MAPbI2.94Cl0.06, and MAPbCl3 (MA - methylammonium) have been investigated using inelastic and quasielastic neutron scattering (QENS) with the aim of elucidating the impact of chloride substitution on the rotational dynamics of MA. In this context, we discuss the influence of the inelastic neutron scattering cau...
Ionic current X-ray absorption spectroscopy (IC-XAS) relaying on the synchrotron beam-induced ionization current was recently proposed as an alternative approach for XAS detection in flow cells. In this study, we investigate the mechanism behind IC-XAS by varying the spacer thickness and the cell orientation. Based on these studies, we propose that...
Single crystals of the methylammonium (MA) lead halides MAPbI3, MAPbBr3, and MAPbCl3 have been investigated using infrared spectroscopy with the aim of analyzing structural and dynamical aspects of processes that enable the ordering of the MA molecule in the orthorhombic crystal structure of these hybrid perovskites. Our temperature-dependent studi...
Single crystals of RbOs2O6 have been grown from Rb2O and Os in sealed quartz ampoules. The crystal
structure has been identified at room temperature as cubic with the lattice constant a=10.1242�12� Å. The
anisotropy of the tetrahedral and octahedral networks is lower and the displacement parameters of alkali metal
atoms are smaller than those for K...
Single crystals of RbOs2O6 have been grown from Rb2O and Os in sealed quartz ampoules. The crystal structure has been identified at room temperature as cubic with the lattice constant a=10.1242(12) Å. The anisotropy of the tetrahedral and octahedral networks is lower and the displacement parameters of alkali metal atoms are smaller than those for K...
We have synthesized, crystallized and studied the structural and electric transport properties of organic molecular crystals based on a rubrene derivative with {\em t}-butyl sidegroups at the 5,11 positions. Two crystalline modifications are observed: one (A) distinct from that of rubrene with larger spacings between the naphtacene backbones, the o...
The title compound, C50H44, is a derivative of rubrene where tert-butyl side groups are added to two of the pendant aromatic rings. Two polymorphs of this derivative, the title compound (form A) and form B, have been identified. The molecule of form A displays a strongly twisted naphthacene backbone. The in-plane arrangement differs from the classi...
The title compound, C50H44, is a derivative of rubrene in which tert-butyl side groups are added to two of the pendant aromatic rings. The complete molecule is generated by a mirror plane, and the unsubstituted and substituted pendant aromatic rings are almost perpendicular to the main backbone of the molecule, which is essentially planar.
Magnetic ions (Mn) were substituted in MgB2 single crystals resulting in a strong pair-breaking effect. The superconducting transition temperature, Tc, in Mg1−xMnxB2 has been found to be rapidly suppressed at an initial rate of 10 K/%Mn, leading to a complete suppression of superconductivity at about 2% Mn substitution. This reflects the strong cou...
Single crystals of KOs2O6 have been grown in a
sealed quartz ampoule. Detailed single crystal x-ray diffraction studies
at room temperature show Bragg peaks that violate Fd3¯m symmetry.
With a comparative structure refinement the structure is identified as
noncentrosymmetric (F4¯3m) . Compared to the ideal β
-pyrochlore lattice (Fd3¯m) , both Os te...
Pure and substituted single crystals of MgB2 have been grown at high pressure (30 kbar) using the cubic anvil technique. The crystals have very low residual resistivity ρo(40 K) ≈ 0.5 and a sharp transition ΔTc ≈ 0.2 K. Magnetic (Mn, Fe) and non-magnetic (Al, C) ions have been substituted to study their effect on superconductivity and on the impuri...
Single crystals of Mg1-xAlxB2 have been grown at a pressure of 30 kbar using the cubic anvil technique. Precipitation free crystals with x < 0.1 were obtained as a result of optimization of already developed MgB2 crystal growth procedure. Systematic decrease of the c-axis lattice constant with increasing Al content, when the a-axis lattice constant...
Single crystals of Mg1-xAlxB2 have been grown at a pressure of 30 kbar using the cubic anvil technique. Precipitation free crystals with x < 0.1 were obtained as a result of optimization of already developed MgB2 crystal growth procedure. Systematic decrease of the c-axis lattice constant with increasing Al content, when the a-axis lattice constant...
Fourier transform infrared (FTIR) studies on small single crystals have been performed with the aim to analyse structural and dynamical aspects of the H-bond network in Rb3H(SeO4)2. A comparative factor group analysis for both the monoclinic and the trigonal phase of Rb3H(SeO4)2, based on centrosymmetric (C2/c and R3¯m) and non-centrosymmetric (Cc,...
Proton conductivity in M3H(SeO4)2 crystals (M=K, Rb, Cs) is shown to be due to a dynamic disorder in the form of an intracrystalline chemical equilibrium reaction: alternation between the association of the monomers [HSeO4]1- and [SeO4]2- resulting in the dimer [H(SeO4)2]3- (H-bond formation) and the dissociation of the latter into the two monomers...
Durch eine Verknüpfung von QINS-Untersuchungen und spektroskopischen Messungen mit FTIR-MS und IINS konnten neue Erkenntnisse über die Protonen-Dynamik in Rb3H(SeO4)2 erhalten werden. Mit Hilfe von Faktorgruppenanalysen und FTIR-MS-Messungen konnte gezeigt werden, daß eine zentrosymmetrische, zeitlich gemittelte Kristallstruktur nicht zur Beschreib...
Fe-staurolite synthesized in the pressure range 5 to 25 kbar at 680 Q C was analysed by microprobe and by a titration method (for water-contents) which uses the "Karl-Fischer" reaction and also characterized by FT-infrared powder spectroscopy in the OH-stretching region (3000-4000 cm 1). The study shows that the stoichiometry of the synthetic Fe-st...
Results of a temperature-dependent crystallographic study of the solid state protonic conductor α-Zr(HPO4)2 · H2O are presented. Lattice parameters of this monohydrate and of its dehydrated phases, α-Zr(HPO4)2 and β-Zr(HPO4)2, have been determined in the temperature range from 20 K to 650 K using X-ray and synchrotron powder diffraction. Neutron da...
The crystal structures of Rb3H(SeO4)2 have been determined in the rhombohedral proton conducting phase at 498 K and in the monoclinic ordered phase at 298 K by means of neutron powder diffraction. Special emphasis is given to the determination of accurate positions for the light atoms. The proton conduction mechanism in the high temperature phase i...