Network


Latest external collaboration on country level. Dive into details by clicking on the dots.

Hotspot


Dive into the research topics where Kjeld Bøhm Andersen is active.

Publication


Featured researches published by Kjeld Bøhm Andersen.


Applied Physics Letters | 2012

High performance magnetocaloric perovskites for magnetic refrigeration

Christian Robert Haffenden Bahl; David Velázquez; Kaspar Kirstein Nielsen; Kurt Engelbrecht; Kjeld Bøhm Andersen; Regina Bulatova; Nini Pryds

We have applied mixed valance manganite perovskites as magnetocaloric materials in a magnetic refrigeration device. Relying on exact control of the composition and a technique to process the materials into single adjoined pieces, we have observed temperature spans above 9 K with two materials. Reasonable correspondence is found between experiments and a 2D numerical model, using the measured magnetocaloric properties of the two materials as input.


Journal of Materials Chemistry | 2012

NOx conversion on LSM15-CGO10 cell stacks with BaO impregnation

Marie Lund Traulsen; Kjeld Bøhm Andersen; Kent Kammer Hansen

The electrochemical conversion of NOx on non-impregnated and BaO-impregnated LSM15-CGO10 (La0.85Sr0.15MnO3–Ce0.9Gd0.1O1.95) porous cell stacks has been investigated, and extensive impedance analysis have been performed to identify the effect of the BaO on the electrode processes. The investigation was conducted in the temperature range 300–500 °C, a polarisation range from 3 V to 9 V and in atmospheres containing 1000 ppm NO, 1000 ppm NO + 10% O2 and 10% O2. On the non-impregnated cell stacks no NOx conversion was observed under any of the investigated conditions. However, BaO impregnation greatly enhanced the NOx conversion and at 400 °C and 9 V polarisation a BaO-impregnated cell stack showed 60% NOx conversion into N2 with 8% current efficiency in 1000 ppm NO + 10% O2. This demonstrates high NOx conversion can be achieved on an entirely ceramic cell without expensive noble metals. Furthermore the NOx conversion and current efficiency was shown to be strongly dependent on temperature and polarisation. The impedance analysis revealed that the BaO-impregnation increased the overall activity of the cell stacks, but also changed the adsorption state of NOx on the electrodes; whether the increased activity or the changed adsorption state is mainly responsible for the improved NOx conversion remains unknown.


Journal of The European Ceramic Society | 2014

In situ characterization of delamination and crack growth of a CGO-LSM multi-layer ceramic sample investigated by X-ray tomographic microscopy

Rasmus Bjørk; Vincenzo Esposito; E.M. Lauridsen; Peter Stanley Jørgensen; Julie L. Fife; Kjeld Bøhm Andersen; Søren Preben Vagn Foghmoes; Nini Pryds

The densification, delamination and crack growth behavior in a Ce0:9Gd0:1O1:95 (CGO) and (La0:85Sr0:15)0:9MnO3 (LSM) multi-layer ceramic sample was studied using in situ X-ray tomographic microscopy (microtomography), to investigate the critical dynamics of crack propagation and delamination in a multilayered sample. Naturally occurring defects, caused by the sample preparation process, are shown not to be critical in sample degradation. Instead defects are nucleated during the debinding step. Crack growth is significantly faster along the material layers than perpendicular to them, and crack growth and delamination only accelerates when sintering occurs.


Heliyon | 2017

Permeability, strength and electrochemical studies on ceramic multilayers for solid-state electrochemical cells

Kjeld Bøhm Andersen; Benoit Charlas; Eugen Stamate; Kent Kammer Hansen

An electrochemical reactor can be used to purify flue gasses. Such a reactor can be a multilayer structure consisting of alternating layers of porous electrodes and electrolytes (a porous cell stack). In this work optimization of such a unit has been done by changing the pore former composition and the electrode powder pre-treatment. The effect on permeability, mechanical strength and electrochemical behavior was studied in this work. The effects were evaluated by measuring the pressure difference over the samples in relation to the flow through the sample, by the ball on ring method and by electrochemical impedance spectroscopy in air at temperatures between 300 and 450 °C. The resulting structures were also evaluated with scanning electron microscopy. The work showed a dependence on the pore former composition and electrode powder pre-treatment resulting in variations in porosity, strength and flow resistance. A higher porosity gives a lower backpressure. The electrochemical performance shows that both thickness and amount of pore former in the electrolyte is important, but almost no dependence of electrode composition on the polarization resistances within the tested compositions.


Journal of The European Ceramic Society | 2013

Densification and grain growth during sintering of porous Ce0.9Gd0.1O1.95 tape cast layers: A comprehensive study on heuristic methods

De Wei Ni; Cristine Grings Schmidt; Francesca Teocoli; Andreas Kaiser; Kjeld Bøhm Andersen; Severine Ramousse; Vincenzo Esposito


Journal of the American Ceramic Society | 2013

Camber Evolution and Stress Development of Porous Ceramic Bilayers During Co-Firing

De Wei Ni; Vincenzo Esposito; Cristine Grings Schmidt; Tesfaye Tadesse Molla; Kjeld Bøhm Andersen; Andreas Kaiser; Severine Ramousse; Nini Pryds


Ionics | 2009

Processing and characterization of porous electrochemical cells for flue gas purification

Zeming He; Kjeld Bøhm Andersen; Li Keel; Frederik Berg Nygaard; Mohan Menon; Kent Kammer Hansen


Journal of The European Ceramic Society | 2016

Effect of pore formers on properties of tape cast porous sheets for electrochemical flue gas purification

Cristine Grings Schmidt; Kent Kammer Hansen; Kjeld Bøhm Andersen; Zongwen Fu; Andreas Roosen; Andreas Kaiser


Journal of The European Ceramic Society | 2014

Sintering and grain growth kinetics in La0.85Sr0.15MnO3–Ce0.9Gd0.1O1.95 (LSM–CGO) porous composite

De Wei Ni; Kjeld Bøhm Andersen; Vincenzo Esposito


Ceramics International | 2012

Pore former induced porosity in LSM/CGO cathodes for electrochemical cells for flue gas purification

M. Skovgaard; Kjeld Bøhm Andersen; Kent Kammer Hansen

Collaboration


Dive into the Kjeld Bøhm Andersen's collaboration.

Top Co-Authors

Avatar

Kent Kammer Hansen

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Andreas Kaiser

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar
Top Co-Authors

Avatar

Cristine Grings Schmidt

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Frederik Berg Nygaard

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Mohan Menon

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Nini Pryds

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Regina Bulatova

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Vincenzo Esposito

Technical University of Denmark

View shared research outputs
Top Co-Authors

Avatar

Zeming He

Technical University of Denmark

View shared research outputs
Researchain Logo
Decentralizing Knowledge