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Topic Name: Oxide-based SOFC Anode Materials
Category: Chemical
Research persons: Nortwest National Laboratory
Location: WA, United States
Details
In a fuel cell, the anode facilitates the reaction between hydrogen, carbon
monoxide and hydrocarbon fuels with oxygen ions that permeate the electrolyte
from the cathode side of the cell. An ideal anode should have high electrical
conductivity and electrocatalytic activity, and further, it would be
advantageous if the anode was tolerant to intermittent air exposure and
sulfur-containing compounds in hydrocarbon fuels such as gasoline, diesel and
natural gas.
Researchers at PNNL have developed a new class of nickel-free anode
materials, consisting of a composite of doped cerium oxide and doped strontium
titanate. These materials show excellent electrical conductivity, an activity
similar to nickel, and are tolerant to the presence of impurities in the fuel
such as sulfur. The new class of materials are presently being engineered for
use in large SOFC stacks.
The novel materials provide the positive attributes of metal electrodes like
nickel with additional degradation characteristics. This combination of
materials and characteristics provide for strong performance and longer life of
the cell.
Advantages
• less susceptible to contaminants such as sulfur.
• oxidation tolerant during shut down cycles.
• comparable to other anode materials in manufacturing cost and process.
• provides for longer life due to the stability in the presence of
contaminants.
| Tags: |
electrocatalytic activity - nickel-free anode materials - doped cerium oxide - - |
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