Abo Bibliothek: Guest
ICHMT DL Home Aktuelles Jahr Archive Vorstand International Centre for Heat and Mass Transfer

Microstructure-Induced Transport Losses in Electrochemical Electrodes

DOI: 10.1615/ICHMT.2015.IntSympAdvComputHeatTransf.1140
page 1220

Wilson K. S. Chiu
Department of Mechanical Engineering, University of Connecticut, 191 Auditorium Road, Storrs, CT, 06269-3139, USA


There is a critical need to understand the role of an energy material's structure, morphology, and composition on electrochemical device performance, such as electrodes used in fuel cells, batteries, and solar cells. This talk will investigate the role of a material's 3-D structure on transport of charge species, and localized Joule heating due to structural restrictions and high resistance regions during transport. Actual 3-D electrode microstructures are imaged using synchrotron-based transmission x-ray microscopy. Three-dimensional structures within the sample volume are tomographically reconstructed at ~30 nm spatial resolution. A rapid assessment tool based on the "Electrochemical Fin" concept is used to describe the transport of charge species in the 3-D shape of the microstructure, surface electrochemical reactions, and ion/electron diffusion in the bulk material. This approach uses analytical closed form solutions to accurately represent the material microstructure as a detailed 3-D network. Preliminary results indicate that computational requirements of this Electrochemical Fin approach is orders of magnitude less than current numerical methods such as finite element or lattice Boltzmann, with comparable accuracy. Solid oxide fuel cell, Li-ion battery, and dye-sensitized solar cell electrodes are examined to provide fundamental insight into the origins of microstructured-induced transport losses during operation.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH