1 / 7

Voltaic Cells

This guide delves into essentials of electrochemical setups, including various battery types like dry cells, lithium-ion, and lead-acid batteries. It explains how these cells generate electricity through spontaneous reactions, with a focus on their voltage, chemical reactions, and energy storage capabilities. Insight into fuel cells and their reactions is also provided. Learn about the construction and chemical processes behind lead-acid batteries, their applications in automobiles, and how they deliver substantial power for quick energy needs.

uyen
Télécharger la présentation

Voltaic Cells

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Voltaic Cells Batteries, etc.

  2. Essentials • Electrochemical setups that can generateelectricity • They release energy and are spontaneous • Ecell is positive (by definition) • Viewed as sources of energy • Voltage depends on the chemical reaction • Amount (amps) depends on the size of the cell

  3. Many types of batteries • Dry Cells ("D", "AA" "AAA" ) • Lithium ion battery • Car Batteries (Lead Acid) • Rechargable (can be some types of lithium or Nickel/ Cadmium (Ni/Cad) • Fuel Cells (Hydrogen/Oxygen)

  4. The Chemical Reaction Overall 2MnO2 + Zn Zn2+O + Mn2O3 The zinc is oxidized: Zn0 Zn2+ + 2 e- The manganese is reduced: 2 x [1 e- + (Mn4+)O2 ] (Mn3+) 2O3

  5. The Lead Acid Battery Used in automobiles Made of Lead plate, lead oxide and sulfuric acid nasty and toxic Great for holding a LOT of electricity Good for rapid charge and discharge Lots of rapidly available power (as in turning around a 300 pound car engine fast enough to get it started) Made of 6 cells put together: each cell gives 2 volts, Together they make 12 volts.

  6. The chemical reaction: 2 e- The discharge… PbO2 + 2 H2SO4 + Pb2PbSO4 + H2O Some lead is oxidized: Pb0  Pb4+ + 2 e – (SO4 2- is a spectator) Some lead is reduced: 2 e - + Pb4+O2  Pb4+ + H2O (SO4 2- is a spectator)

More Related