Joachim Bansmann

Joachim Bansmann
Ulm University | UULM · Institute of Surface Chemistry and Catalysis

PD Dr.

About

180
Publications
19,211
Reads
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3,271
Citations
Citations since 2016
55 Research Items
1056 Citations
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
2016201720182019202020212022050100150
Introduction
Joachim Bansmann works at the Institute of Surface Chemistry and Catalysis, Ulm University. His research interest is located in the field of Surface Science (mainly spectroscopy) and Operando X-ray Absorption Spectroscopy on Catalysts. The project 'Ferromagnetic Clusters on Surfaces' refers to earlier work that was partly peformed at the University of Rostock.
Additional affiliations
January 2017 - present
Deutsches Elektronen-Synchrotron
Position
  • Operando X-ray absorption spectroscopy at powder catalysts
Description
  • beam times at P65
February 2015 - present
Sincrotrone Trieste S.C.p.A.
Position
  • Operando X-ray absorption spectroscopy at powder catalysts
Description
  • beam times at XAFS beamline
October 2005 - present
Ulm University
Position
  • Model catalysis
Education
March 2000 - September 2005
University of Rostock
Field of study
  • Experimental Physics
December 1999 - February 2000
Université de Paris Sud
Field of study
  • Experimental Physics
October 1993 - December 1999
University of Rostock
Field of study
  • Experimental Physics

Publications

Publications (180)
Article
Full-text available
The adsorption properties of structurally well defined bimetallic Pt/Ru(0001) surfaces, consisting of a Ru(0001) substrate partly or fully covered by monolayer Pt islands or a monolayer Pt film, were studied by temperature programmed desorption (TPD) using CO and deuterium as probe molecules. Additionally, the adsorption of CO was investigated by i...
Article
Full-text available
Background: Magnetic nanostructures and nanoparticles often show novel magnetic phenomena not known from the respective bulk materials. In the past, several methods to prepare such structures have been developed - ranging from wet chemistry-based to physical-based methods such as self-organization or cluster growth. The preparation method has a si...
Article
Full-text available
The interaction of CO with structurally well-defined PdAg/Pd(111) surface alloys was investigated by temperature-programmed desorption (TPD) and high-resolution electron energy loss spectroscopy (HREELS) to unravel and understand contributions from electronic strain, electronic ligand and geometric ensemble effects. TPD measurements indicate that C...
Article
The Front Cover illustrates the chemical reactions of an ionic liquid with Li atoms. Combining experiment and theory, initial products in the solid‐electrolyte interphase formation are clearly identified. More information can be found in the Research Article by K. Forster‐Tonigold and co‐workers.
Article
Invited for this month's cover picture is the work of Prof. Groß’ and Prof. Behm's groups at the Helmholtz Institute Ulm (HIU) Electrochemical Energy Storage and Ulm University. The cover picture shows the model study on the chemical reactions of the ionic liquid BMP‐TFSI with Li atoms. The combined study of XPS experiments and DFT calculations ide...
Article
: The development of synthetic particles that emulate real viruses in size, shape, and chemical composition is vital to the development of imprinted polymer-based sorbent materials (MIPs). In this study, we address surrogates for adenovirus type 5 (Adv 5) via the synthesis and subsequent modification of icosahedral gold nanoparticles (iAuNPs) decor...
Article
Full-text available
Employing density functional theory (DFT) calculations and x-ray photoelectron spectroscopy (XPS), we identify products of the reaction of the ionic liquid N,N - butylmethylpyrrolidinum bis(triuoromethylsulfonyl)imide (BMP-TFSI) with lithium in order to model the initial chemical processes contributing to the formation of the solid electrolyte inte...
Article
Full-text available
Supported gold nanoparticles are widely studied catalysts and are among the most active known for the low-temperature water-gas shift reaction, which is essential in fuel and energy applications, but their practical application has been limited by their poor thermal stability. The catalysts deactivate on-stream via the growth of small Au nanopartic...
Article
Full-text available
Carbon nanofiber nonwovens (CFN) are powerful electrode materials with exceptional performance in energy storage devices, such as batteries and supercapacitors. Small fiber‐diameters together with hierarchical porosity endow CFN‐electrode materials with large surface areas and high electrical capacitance. Porosity of the fiber surface is often real...
Article
Full-text available
Li‐rich layered oxides (LRLO) with specific energies beyond 900 Wh kg ‐1 are one promising class of high‐energy cathode materials. Their high Mn‐content allows reducing both costs and the environmental footprint. In this work, Co‐free Li 1.2 Mn 0.6 Ni 0.2 O 2 was investigated. A simple water and acid treatment step followed by a thermal treatment w...
Article
The influence of Si doping of high specific-surface-area Ru/TiO2 catalysts with similar structural properties on the CO2 reduction reaction was systematically investigated by kinetic measurements, combined with microscopic and spectroscopic methods for ex situ and in situ/operando catalyst characterization. While for undoped Ru/TiO2 a high-temperat...
Preprint
Full-text available
Employing density functional theory (DFT) calculations and x-ray photoelectron spectroscopy (XPS), we identify products of the reaction of the ionic liquid N,N - butylmethylpyrrolidinum bis(trifluoromethylsulfonyl)imide (BMP-TFSI) with lithium in order to model the initial chemical processes contributing to the formation of the solid electrolyte in...
Article
Full-text available
Carbon nanofibers are produced from dielectric polymer precursors such as polyacrylonitrile (PAN). Carbonized nanofiber nonwovens show high surface area and good electrical conductiv-ity, rendering these fiber materials interesting for application as electrodes in batteries, fuel cells, and supercapacitors. However, thermal processing is slow and c...
Article
Full-text available
We report carbonization of polyacrylonitrile by direct laser writing to produce microsupercapacitors directly on-chip. We demonstrate the process by producing interdigitated carbon finger electrodes directly on a printed circuit board, which we then employ to characterize our supercapacitor electrodes. By varying the laser power, we are able to tun...
Article
Full-text available
As part of an extensive study of the interaction between Zn and Au in Zn/Au(111) model systems we have systematically investigated the low-temperature (LT) nucleation and growth behavior of Zn on the Au(111) surface as well as the thermal stability of the resulting structures towards sintering, intermixing and dissolution by scanning tunneling micr...
Article
Full-text available
The methanation of CO2 is a highly attractive process both for reducing CO2 levels in the atmosphere and for the chemical storage of electric energy from renewable sources. Using mixed rutile-anatase supported Ru/TiO2 catalysts with similar Ru particle size and loading, but different specific surface areas (SSA) of the support and, for comparison,...
Article
Full-text available
Discrimination between electronic and structural effects in metal-support interactions (MSIs) is often hampered by contributions from either one. We report results of a combined experimental/theoretical study that directly demonstrate the action of electronic MSIs, while structural modifications like a partial overgrowth of metal nanoparticles by a...
Article
Disentangling the potential dependent surface(electro)chemical processes can be an arduous task, in particular for ill-defined electrode surfaces or when several reactions either coincide or occur without electron transfer. Employing ultrahigh vacuum surface preparation, electrochemical measurements and in situ spectroscopic / structural characteris...
Article
Full-text available
The discovery of the activity of dispersed gold nanoparticles three decades ago paved the way for a new era in catalysis. The unusual behavior of these catalysts sparked many questions about their mechanism of work. In particular, Au/CeO2 proved to be an efficient catalyst material in several reactions such as CO oxidation, water gas shift, and CO...
Article
Full-text available
Continuing our efforts to elucidate the working principle of Au/ZnO catalysts for the synthesis of green methanol from CO2 and H2, we present a systematic X-ray photoelectron spectroscopy (XPS) study on the interaction of bimetallic Zn/Au(111) surfaces with O2 and NO2 (O*), on the oxidation of Zn atoms in these bimetallic model systems and on the f...
Article
Full-text available
The oxidation of CO on planar Au/TiO2 model catalysts was investigated under pressure and temperature conditions similar to those for experiments with more realistic powdered Au/TiO2 catalysts. The effects of a change of temperature, pressure, and gold coverage on the CO oxidation activity was studied. Additionally, the reasons for the deactivation...
Article
Full-text available
In this work we aim towards the molecular understanding of the solid electrolyte interphase (SEI) formation at the electrode electrolyte interface (EEI). Herein, we investigated the interaction between the battery-relevant ionic liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethyl-sulfonyl)imide (BMP-TFSI), Li and a Co3O4(111) thin film mo...
Article
Full-text available
Aiming at a better understanding of the role of electronic / chemical modifications of the support on the performance of high specific surface area Ru/TiO 2 catalysts in the selective CO methanation, we prepared and examined four different Ru/TiO 2 catalysts with similar Ru loading and similar high specific surface area, but with the support doped...
Article
Full-text available
Ru/Al2O3 is a highly stable, but less active catalyst for methanation reactions. Here we report an effective approach to significantly improve its performance in the methanation of CO2/H2 mixtures. Highly active and stable Ru/γ‐Al2O3 catalysts were prepared by high‐temperature treatment in the reductive reaction gas. Operando / in situ spectroscopy...
Article
Full-text available
Ru/Al2O3 ist ein außerordentlich stabiler, aber weniger aktiver Katalysator für Methanisierungs-Reaktionen. Hier berichten wir über einen neuartigen Ansatz, mit dem die katalytische Aktivität dieser Katalysatoren bei der Methanisierung von CO2 in CO2/H2 Gemischen erheblich gesteigert werden kann. Hochaktive und –stabile Ru/γ-Al2O3 Katalysatoren wur...
Article
Full-text available
As part of an extensive effort to explore the function of Au/ZnO catalysts in the synthesis of methanol from CO2 and H2 we have systematically investigated the temperature dependent growth, structure formation and surface intermixing of Zn on the herringbone reconstructed Au(111) surface and the thermal stability of the resulting surfaces by scanni...
Article
Full-text available
While being highly active for the CO oxidation reaction already at low temperatures, Au/CeO2 catalysts suffer from continuous deactivation with time on stream, with the activity and deactivation depending on the initial catalyst activation procedure. In previous X-Ray absorption measurements at the Au LIII edge, which focused on changes in the elec...
Article
Full-text available
Aiming at a molecular level understanding of the processes at the electrode|electrolyte interface (EEI), we investigated the interaction between the battery-relevant Ionic Liquid (IL) 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP]+[TFSI]‒), Li and CoO(111) thin films on Ru(0001) as a model study of the solid|electrolyte inte...
Article
Full-text available
Ru/TiO2‐Katalysatoren sind sehr aktiv für die selektive Methanisierung von CO in CO2‐ und H2‐reichen Reformat‐Gasmischungen, werden aber während der Reaktion leicht deaktiviert. Diese Einschränkung kann mithilfe hoch‐aktiver und nicht deaktiviert werdender Ru/TiO2‐Katalysatoren über die gezielte Optimierung der Morphologie des TiO2‐Trägers überwund...
Article
Full-text available
Ru/TiO2 catalysts exhibit an exceptionally high activity in the selective methanation of CO in CO2 and H2-rich reformates, but suffer from continuous deactivation during reaction. Here we report on a successful attempt to overcome this limitation, fabricating highly active and non-deactivating Ru/TiO2 catalysts by morphology-engineering of the TiO2...
Data
Supporting Information to Manuscript in Angewandte Chemie
Article
Full-text available
We report results of a combined experimental and computational model study on the interaction of the battery-relevant Ionic Liquid (IL) 1-butyl-1-methylpyrrolidinium bis(tri-fluoromethylsulfonyl)imide ([BMP]+[TFSI]‒) with Li on pristine highly oriented pyrolytic graphite (HOPG), which aims at a molecular/atomic level understanding of the processes...
Data
Large-scale STM images after vapor deposition of a [BMP]+[TFSI]− (sub-)monolayer on Ag(111) (a), Au(111) (b), HOPG(0001) (c), Cu(111) (d), and TiO2(110) (e) at RT and subsequent cooling to 100 K. On the more reactive Cu(111) surface, the IL was adsorbed at 200 K to avoid decomposition. STM imaging was also conducted at 100 K. A molecular representa...
Article
Full-text available
Ionic liquids (ILs) are considered as attractive electrolyte solvents in modern battery concepts such as Li-ion batteries. Here we present a comprehensive review of results of previous model studies on the interaction of the battery relevant IL 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide ([BMP] + [TFSI] ‒ ) with a series of stru...
Article
Full-text available
The intercalation and deintercalation of lithium (Li) into graphite(0001), which is a highly important process in Li-ion batteries, was investigated under ultrahigh vacuum conditions as a function of temperature, employing X-ray and ultraviolet photoelectron spectroscopy (XPS / UPS). Both the up-shifts of the core level binding energy and the lower...
Article
Full-text available
The influence of oxidative / reductive pretreatment, oxidative re-activation and ongoing CO oxidation on the chemical / electronic properties of a 4.5 wt.% Au/CeO 2 catalyst was investigated by in operando X-ray absorption spectroscopy at the Au L III edge. Experimental data on the electronic structure and the size of the Au nanoparticles are corre...
Article
Full-text available
Operando XAS measurements in the near (XANES) and the extended (EXAFS) Au LIII edge as well as in situ diffuse reflectance FTIR (DRIFTS) spectroscopy were employed in combination with kinetic measurements in a further attempt to identify the nature of the active Au species responsible for the high activity of Au/CeO2 catalyst in the low-temperature...
Chapter
The formation of clusters and nanoparticles in the gas phase under non-equilibrium conditions can be used to create objects with unique physical and chemical properties that cannot be reached by other techniques. In order to conserve those properties during deposition and to select only particles with a certain number of atoms and specific propertie...
Article
The passive nature of stainless steels usually makes them difficult to bond and a pre-treatment process is often required. Now an in-depth study has been carried out into the influence of laser treatment on the durability of stainless steel bonding.
Article
Full-text available
We have investigated the impact and role of the Pt surface modification on the coadsorption of hydrogen and CO on structurally well defined bimetallic Pt monolayer island/film modified Ru(0001) surfaces with Pt contents up to a complete Pt layer, employing temperature programmed desorption (TPD) and infrared reflection absorption spectroscopy (IRRA...
Article
Full-text available
The influence of the pretreatment on the activity and deactivation behavior of a high surface area 4.5 wt.% Au/CeO2 catalyst during low temperature CO oxidation reaction (T_react = 80°C) was studied in a multi-technique approach. Furthermore, the influence of changing from a close-to-stoichiometric (1% CO, 1% O2 rest N2), to O2-rich (1% CO, 5% O2 r...