Andreas Bodén

In-situ Measurements of Contact Resistance and In-situ Durability studies of Steels and Coatings to be used as Bipolar Plates in PEMFCs

In this study, a fast, low cost and reliable methodology for bipolar plate material screening and testing is presented. Ex-situ measurements of contact resistance are used as a screening tool, while in-situ measurements such as: fuel cell performance, in-situ contact resistance, high frequency impedance spectroscopy, together with post analysis of stainless steel surfaces, MEAs and fuel cell effluent water evaluates the real performance of the most promising stainless steels and coatings, providing reliable data for future fuel cell stack test.

Structural and Electrical Properties of Gadolinia-doped Ceria Mixed with Alkali Earth Carbonates for SOFC Applications

The properties of composite materials based on mixtures of gadolinium-doped ceria (GDC) and Li(2)CO(3)-K(2)CO(3) are analyzed as potential SOFC electrolytes. In a temperature range higher than 500 degrees C, their ionic conductivity is significantly higher than for single GDC. Discontinuities were found in the conductivity Arrhenius diagram (sigma vs. 1/T) around the melting point of the carbonate mixture (490 degrees C), showing, at least partially, the contribution of molten carbonates. At this stage, precise mechanisms are still under analysis.

A Model for Mass Transport of Molten Alkali Carbonate Mixtures Applied to the MCFC

A one-dimensional model based on the Stefan-Maxwell formulation for mass transfer of the main components of a binary molten carbonate electrolyte, including all of the nonidealities, was formulat ...

A Steady-State Model of the Porous Molten Carbonate Fuel Cell Anode for Investigation of Kinetics and Mass Transfer

The purpose of this paper was to investigate the effect of gas phase mass transfer and the influence of different reactions on the anode performance and to understand previously made experiments ...

Influence of Anode Pore-Size Distribution and Total Electrolyte Filling Degree on Molten Carbonate Fuel Cell Performance

Experimental data of the total cell reaction resistance as a function of the total electrolyte filling degree was measured to investigate how more electrolyte initially may be added to get as lon ...

Enhanced photon collection enables four dimensional fluorescence nanoscopy of living systems

The theoretically unlimited spatial resolution of fluorescence nanoscopy often comes at the expense of time, contrast and increased dose of energy for recording. Here, we developed MoNaLISA, for Molecular Nanoscale Live Imaging with Sectioning Ability, a nanoscope capable of imaging structures at a scale of 45–65 nm within the entire cell volume at low light intensities (W-kW cm−2). Our approach, based on reversibly switchable fluorescent proteins, features three distinctly modulated illumination patterns crafted and combined to gain fluorescence ON–OFF switching cycles and image contrast. By maximizing the detected photon flux, MoNaLISA enables prolonged (40–50 frames) and large (50 × 50 µm2) recordings at 0.3–1.3 Hz with enhanced optical sectioning ability. We demonstrate the general use of our approach by 4D imaging of organelles and fine structures in epithelial human cells, colonies of mouse embryonic stem cells, brain cells, and organotypic tissues.Super-resolution microscopy often suffers from low contrast and slow recording times. Here the authors present an optical implementation which makes the fluorescent proteins’ ON–OFF switching cycles more efficient, enhancing contrast and spatio-temporal resolution in 3D cell and tissue imaging.

Fast reversibly photoswitching red fluorescent proteins for live-cell RESOLFT nanoscopy

Reversibly photoswitchable fluorescent proteins (rsFPs) are gaining popularity as tags for optical nanoscopy because they make it possible to image with lower light doses. However, green rsFPs need violet-blue light for photoswitching, which is potentially phototoxic and highly scattering. We developed new rsFPs based on FusionRed that are reversibly photoswitchable with green-orange light. The rsFusionReds are bright and exhibit rapid photoswitching, thereby enabling nanoscale imaging of living cells.Bright reversibly switching red fluorescent proteins (rsFusionReds) with fast switching kinetics and low fatigue enable RESOLFT and MoNaLISA nanoscopy of live cells with green-orange illumination, which further reduces the risk of phototoxicity.