10.626 Lecture Notes, Forced convection in fuel cells II

Thermal -Hidraolyc Study of Trr Core in Fuel Conversion Frome Highly Enriched Uranium to Low Enriched Uranium Fuel (RESEARCH NOTES)

10.626 Lecture Notes, Impedance of electrodes

In the previous lecture, we leant about impedance spectroscopy. Electrochemical impedance spectroscopy is the technique where the cell or electrode impedance is platted versus frequency. Thus, the impedance is measured as a function of the frequency of the AC source. Electrochemical impedance spectroscopy is a useful method for investigating porous electrodes, which are extensively used in the ...

10.626 Lecture Notes, Ion absorption and intercalation

Adsorption on a surface or intercalation in a bulk solid involves strong particle interactions which go beyond dilute solution theory. For example, in fuel cell, the hydrogen molecules need to attach onto the Pt catalyst and then split into two atoms or protons to be further reacted. Similarly, in Li ion battery, Li must be intercalated into the host crystal and then react with the active mater...

10.626 Lecture Notes, Electrostatic Correlations

Until now, we have developed continuum models for the dynamics of electrolytes at the macroscopic scale, much larger than typical length scales for intermolecular forces. In particular, we have used principles of nonequlibrium thermodynamics, to arrive at general models of interfacial voltage (Nernst equation), reaction kinetics (Butler-Volmer equation), and transport (Poisson-Nernst-Planck equ...

10.626 Lecture Notes, Transient diffusion

Notes by ChangHoon Lim 1. Warburg impedance for semi-infinite oscillating diffusion Warburg (Ann. Physik. 1899) is credited with the first solution to the diffusion equation with oscillating concentration at the boundary, which is related to the diffusional (or mass transfer) impedance of electrochemical systems. An interesting point made in the first part of the class is that the very same mat...