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Anode
The anode is the electrode in an electrochemical cell where oxidation occurs. Electrons are produced at the anode and flow into the external circuit.
Fuel cell
A fuel cell is a device that converts chemical energy directly into electrical energy through a redox reaction.
Hydrogen fuel cell
The hydrogen fuel cell is one of the most commonly discussed types of fuel cells. It uses hydrogen gas ($H_2$) as a fuel and oxygen gas ($O_2$) from the air to produce water ($H_2O$), electricity, and heat.
Methanol fuel cell
The methanol fuel cell is another promising type of fuel cell that uses methanol ($\mathrm{CH_3OH}$) as a fuel source. It operates similarly to the hydrogen fuel cell but offers the advantage of using a liquid fuel, simplifying storage and transport.