NOVELTY - Fuel cell (10) includes channel (14) having a first side and a second side, an inlet (20) for coupling to a source of fuel, an outlet (22) downstream of the inlet, and a bubble generating region (26) between the inlet and outlet, where first side of the channel comprises anode (16) having a first catalyst for oxidizing fuel within the channel, and second side of the channel comprises cathode (18) having second catalyst for reducing oxidant within the channel.    USE - The fuel cell is used in fuel cell system (claimed). It is used to build miniature fuel cells for miniature electronic devices, or scaled to build larger fuel cells for larger electronic devices.    ADVANTAGE - The fuel cell does not use polymer electrolyte membrane and actively supplies fuel without a discrete pump. One stream of fuel and electrolyte self-pumps using the by-product bubbles in the single channel containing both the anode and the cathode. A membraneless (i.e. no membrane electrode assembly) active (i.e. the fuel is pumped) fuel cell with no moving parts is realized. The simple solid-state construction not only enables miniature fuel cells, but also makes the design and manufacturing scalable. The scalability allows one to build regular-scale systems by stacking the miniature fuel cells.    DETAILED DESCRIPTION - Fuel cell (10) comprises channel (14) having a first side and a second side, an inlet (20) for coupling to a source of fuel, an outlet (22) downstream of the inlet, and a bubble generating region (26) between the inlet and outlet, where first side of the channel comprises anode (16) having a first catalyst for oxidizing fuel within the channel, and second side of the channel comprises cathode (18) having second catalyst for reducing oxidant within the channel; one-way valve in communication with the channel, and located upstream of the bubble generating region; and vent in communication with the channel, and disposed over a portion of the channel downstream of the bubble generating region. INDEPENDENT CLAIMS are included for:    (A) operation of fuel cell; and    (B) fuel cell system.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view of fuel cell.    Fuel cell (10)    Channel (14)    Anode (16)    Cathode (18)    Inlet (20)    Outlet (22)    Bubble generating region (26)