10 Questions
What unique properties of fluorocarbons enabled the development of thin, high-performance gas electrodes?
Hydrophobicity combined with gas porosity
In what year were alkaline electrolyte zinc-air batteries constructed by Heise and Schumacher?
1932
What is the primary drawback of voltaic cells using hydrogen gas?
Hydrogen gas acts as an insulator, reducing the effective area of the cathode and resulting in very low current.
What type of bonds are present in fluorocarbons?
C-F bonds
What is the purpose of impregnating porous carbon air cathodes with wax in zinc-air batteries?
To prevent flooding
What enabled the development of thin, efficient air cathodes in modern zinc-air button batteries?
The emergence of fluorocarbons as a polymer class
What is the formula for fluorocarbons?
CxFy
What is the main advantage of zinc-air batteries?
Very high energy densities
What is the role of Teflon in the structure of high-performance gas electrodes?
Teflon is used as a bonding agent for the catalyst structure
What class of compounds are fluorocarbons also known as?
Perfluorocarbons or PFCs
Test your knowledge on key concepts in electrochemistry such as voltaic cells, Daniell cells, standard states, and calculating cell potentials using Nernst equation. Explore the effects of different materials and structures on the properties of electrochemical cells.
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