Electrochemical mass-transfer studies, model reactions used

Model Reactions Used in Electrochemical Mass-Transfer Studies... 

When we begin to investigate an electrochemical system, we normally know little about the processes or mechanisms within the system. Electrochemical impedance spectroscopy (EIS) can be a powerful approach to help us establish a hypothesis using equivalent circuit models. A data-fitted equivalent circuit model will suggest valuable chemical processes or mechanisms for the electrochemical system being studied. From Chapter 1, we know that a fuel cell is actually an electrochemical system involving electrode/electrolyte interfaces, electrode reactions, as well as mass transfer processes. Therefore, EIS can also be a powerful tool to diagnose fuel cell properties and performance. 

Porous media finds extensive application in chemical engineering. In certain cases they are simply used to increase the mass transfer rate between two distinct phases, while in certain other cases they are used to disperse the catalyst effectively. Catalytic packed beds are an integral part of any chemical production industry. Solid Oxide Fuel Cells are class of electrochemical devices where porous media finds important application. Over the years many models have been developed to study the transport processes in porous media, starting from simple Fickian approach to complex Dusty Gas Model GDGM). However, very little is done to validate the accuracy of these models under reaction conditions, especially with multi-component species mixtures. 

Modeling carbon monoxide poisoning is normally categorized under mass transport studies. Wang and Savinell [17] created a model of a carbon monoxide-poisoned anode that used variable membrane conductivity data of Springer et al. [15,16]. Only the mass transfer, proton migration, and electrochemical reaction of the anode catalyst layer were modeled. The local current production was found using ... 

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