Electrochemical Impedance Spectroscopy Study of the Mass Transfer in an Anode-Supported Microtubular Solid Oxide Fuel Cell

In-situ diagnosis and assessment of longitudinal current variation by electrode-segmentation method in anode-supported microtubular solid oxide fuel cells

“…The gas supply conditions such as flow rate and partial pressure, particularly in the anode, affect the cell performance significantly through the Nernst-loss given by Eq. (1) incorporated in the concentration overpotential with reference to the cell open circuit voltage (OCV) [3][4][5]. In general, a tendency is expected in the current distribution the cell gradually decreasing from the fuel inlet to the outlet if the mass transport process is solely taken into account.…”

“…(2). The heat source coming from the Nernst-loss can be seen as one part of the heat produced by the concentration overpotential resulting in temperature distribution along the cell[5]. Such temperature variation then contributes to the change of reversible cell voltage.where △G [kJ/mol] represents the Gibbs free energy change, △H [kJ/mol], the enthalpy change and, △S [kJ/molK -1 ], the entropy change.…”

Liquid phase oxidation chemistry in continuous-flow microreactors

“…[56][57][58] For fast liquid phase oxidation processes, the reaction rate and the selectivity are significantly influenced by the mass transfer rate, and the key to increase the production rate is to facilitate mass transfer by increasing the interfacial area. [59][60][61][62] Classical reactors, such as mechanically agitated reactors, bubble columns, trickle-bed reactors, result in poorly defined interfacial contact areas. The scale-up of such reactors for a large-scale production is not trivial considering the safety hazards associated with oxidation chemistry.…”

Current and temperature distributions in-situ acquired by electrode-segmentation along a microtubular solid oxide fuel cell operating with syngas

“…This implies that the local heat production rate associated with the overpotentials with the syngas flow is higher than that with the equivalent H 2 /N 2 flow. Thereby, the impact of the endothermic cooling on the local temperatures is smaller [31,32]. Fig.…”