Air supply system for fuel cell and method of controlling same

1. A method of controlling an air supply system for a fuel cell, where the air supply system includes a fuel cell stack, an air channel to supply air to an inlet of the fuel cell stack, a gas adsorption unit disposed on the air channel and configured to adsorb oxygen contained in air introduced into the air channel, the method comprising:

determining whether a power generation operation of the fuel cell stack is resumed;

when the power generation operation of the fuel cell stack is resumed, controlling a voltage source to apply a voltage to the gas adsorption unit; and

supplying air to the fuel cell stack through the air channel in a state in which the voltage is applied to the gas adsorption unit.

2. The method according to claim 1 , further comprising: after supplying the air to the fuel cell stack, purging a fuel return channel by evacuating fuel in the fuel return channel into the air channel, wherein fuel discharged from an outlet of the fuel cell stack is returned to the inlet of the fuel cell stack through the fuel return channel.

3. The method according to claim 2 , further comprising: after purging the fuel return channel, stopping application of the voltage to the gas adsorption unit from the voltage source.

4. The method according to claim 1 , further comprising:

before determining whether the power generation operation of the fuel cell stack is resumed, determining whether the power generation operation of the fuel cell stack is stopped; and

when the power generation operation of the fuel cell stack is stopped, blocking the voltage from being applied to the gas adsorption unit.

5. The method according to claim 1 , wherein in controlling the voltage source to apply a voltage to the gas adsorption unit, connecting a part of multiple unit cells included in the fuel cell stack to the gas adsorption unit.