Galvanic Cell (SAC) Flashcards
Advantages/Disadvanatges of Primary cell
Cheap, easy to produce
Non rechargeable, finite amount of reactants
Advantages/Disadvantages of Secondary cell
Rechargeable, solar power can be used to power, H2O byproduct is safe, non need to change electrodes
Chemicals can be dangerous with leakage
Advantages/Disadvantages of Fuel cell
Constant supply of reactants, more efficient to produce electricity, Hydrogen fuel cells produce safe H2O byproduct
Expensive, require constant fuel supply, storage and safety of h2(g)
Similarities of Primary and Secondary cell
Both have separate half cells with a salt bridge/membrane that allow for the movement of ions across the cell
Differences of Primary and Secondary cell
Primary cell in not rechargeable with metal electrodes
Secondary cell is rechargeable with inert electrodes (usually)
Similarities of Fuel cell and Prim/Sec cells
Both have separated electrodes (anode and cathode) and a membrane/salt bridge/electrolyte that allows for the movement of ions across the cell
both produce electrical energy
Differences of Fuel cell and Prim/Sec cells
Fuel cells require air with o2 to operate unlike prim/sec cells
Prim/sec cells can only produce energy for a limited amount of time, unlike fuel cells
Fuel cells have constant supply of reactants
Use of Primary cells
Minimal, small scale usages (battery in remote, watch, digital camera
Use of Secondary cells
Battery in car, mobile phone, computer, video camera
Use of Fuel cells
Cars, power tools, emergency backup power-supplies (eg, generator)
Battery Life defintion
Refers to the performance of a battery and its exact extent to which it can last to power something
Battery Capacity definition
Refers to the product of the voltage drawn from a cell, whilst the battery is able to supply this load at a constant rate
Effect of high temperature
High temperature causes a decrease in battery life and increase in battery capacity
Increased rate of side reactions and chemical reactions
Effect of low temperature
Low temperature causes an increase in battery life and decrease in battery capacity
Decreased rate of chemical reactions occuring to convert the chemical energy to electrical energy
What features of a fuel cell allow it to produce energy efficiently?
Inert electrodes so they do not take part in the reaction
Porus electrodes for transfer of ions
Using a catalyst (eg. Ni)
