Venkatesh Sarda


„Integrating Degradation Effects Into Lifetime Prediction Models for Solid Oxide Fuel Cells“

Overview of Anode Side Degradation Mechanisms Copyright:

Venkatesh Sarda: „Integrating Degradation Effects Into Lifetime Prediction Models for Solid Oxide Fuel Cells

(EU - 7th Framework Program: SOFC- Life)

Solid Oxide Fuel Cells (SOFC’s) are receiving renewed interest from the energy industry because of their capability to work with a variety of fuels and provide combined heat and power for stationary applications. One of the major limitations to their successful commercial introduction lies in their operational lifetimes. To address this aspect, the Phd project at IEK 9, FZ Juelich focusses on the investigation of the degradation phenomena on the anode side of the Solid Oxide Fuel Cell, with a specific emphasis on its electrochemical performance.

Backed by the EU project titled SOFC-Life, experiments are performed on single components (such as Ni mesh, interconnect steel and NiO-8YSZ substrate) cut out of the anode compartment with the aim of separating degradation mechanisms governed by a single effect. Within the scope of this project, methods such as 4 probe DC conductivity, Electrochemical Impedance spectroscopy (EIS) are being used for measuring the evolution of interfacial contact resistances, polarization resistances and quantify their contributions up to duration of 3000 hours under different temperatures, current density and humidity content. The aim lies at studying the dependencies of these degradation mechanisms and quantifying their individual contributions when the above operating conditions are varied. Finally, the derived functions are used to develop models that can predict lifetimes under long term steady state operation.