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The capacitor plates store the electrons. If the size of the plates is increased, the capacitance increases due to the increased surface area of the plates to store electrons. If the plates are moved farther apart, the capacitance goes down, because the electric field strength between them goes down as the distance increases. Large plates very close together have greater capacitance, however, the voltage rating is less when the plates are more closely spaced. Increasing the space between the plates increases the voltage rating, and decreases capacitance. This can be offset by increasing the surface area of the plates. The reason that the voltage rating is limited is due to arching that can take place between the plates.