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We introduce a monolithic cathode that self-regulates oxygen supply, ideally complementing the recently developed monolithic anode that self-pumps the fuel. Developed is a microstructured cathode that generates oxygen, consumes generated oxygen bubbles as needed, and stops the generation when not consumed, all in a self-regulating fashion. Cyclic voltammetry confirms that the cathode is capable of reducing oxygen even in the presence of simulating a mixed-reactant condition. Half-cell tests show reasonable current outputs, suggesting a complete (full) fuel cell of no moving parts is feasible.