Describe the original and current materials used to construct the electrodes in PAFC systems.
What will be an ideal response?
The original electrodes used when PAFC systems were being developed consisted of platinum black, but the cost soon ended that structure. Current systems use platinum or platinum alloy particles (about two nanometers in diameter and roughly 10 percent by weight) on a fine carbon powder with these supported on carbon (graphite) paper.
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The life cycle energy cost of most building products starts with ____.
A. product shipment B. delivery of raw materials to the processing plant C. the extraction of raw materials D. building demolition
?What method for turning resins into expanded plastics involves forcing pentanes, hexanes, halocarbons, or moistures of these materials into the plastics particles under pressure?
A. ?liquid vaporization B. ?whipping air into the resin and rapidly curing or cooling C. ?dissolving a gas that expands at room temperature D. ?thermal breakdown of a chemical blowing agent
The United States' frequent intervention in the affairs of Latin American countries in the early 20th century
A. established political stability in the area. B. was appreciated in the region as an effective cloak of defense against European threats. C. was a "Bad Neighbor" policy that left a legacy of ill will and distrust of the United States throughout Latin America. D. departed from Theodore Roosevelt's big-stick diplomacy. E. was intended to spread democracy to the region.
The term "Robertson" is associated with:
a. pry bars b. sockets c. punches d. screwdrivers