CCS and Power Systems

Advanced Energy Systems - Solid Oxide Fuel Cells

Study of the Durability of Doped Lanthanum Manganite and Cobaltite Based Cathode Materials Under "Real World" Air Exposure Atmosphere

Performer: University of Connecticut

Project No: FE0009682

Project Scope and Technology Readiness Level

This project is focused on evaluation and analysis of degradation phenomena in lanthanum manganite-based cathode electrodes when exposed to 'real-world' air atmosphere conditions during SOFC systems operation by both experimentation and computational simulation. In particular, the interest is in product formation and interactions with air contaminants, dopant segregation and oxide exolution at free surfaces, cation interdiffusion and reaction products formation at the buried interfaces, interface morphology changes, lattice transformation and the development of interfacial porosity and micro-cracking and delamination from the stack repeat units. The feasibility of the mitigation approaches will also be tested in accelerated conditions enabling rapid evaluation of the cation transport and gas-solid phase interactions. Sensitive probes to measure chemical composition and phase content, in concert with high-accuracy measurements of lattice constants, will provide the first evidence of the cation diffusion-controlled reactions. Structural and morphological characterization of cathode samples will be performed using existing laboratory capabilities such as electrical impedance spectroscopy, high temperature controlled atmosphere X-ray diffractometry, hot stage field emission scanning electron microscopy, focused ion beam microscopy and micro-machining, transmission electron microscopy, Auger electron spectroscopy, and X-ray photoelectron spectroscopy (XPS) techniques. The results will be used to identify and develop initiation and progression of the interfacial and surface reactions. Thermochemical simulation of interface atomic configurations using first principle thermodynamics, density functional theory and statistical mechanics will be utilized. Generalized gradient approximation (GGA) with projector augmented wave (PAW) method as implemented in Vienna Ab initio Simulation Package (VASP) along with a small number of beyond- density functional theory DFT computations will be performed.

The Technology Readiness Level (TRL) assessment identifies the current state of readiness of the key technologies being developed under the DOE’s Clean Coal Research Program. In FY 12, this project was not assessed.

The TRL assessment process and its results including definition and description of the levels may be found in the "2012 Technology Readiness Assessment-Analysis of Active Research Portfolio".

Project Details