Components for electrochemical devices including multi-unit device arrangements

A system comprising:

• a plurality of interconnected fuel-to-energy conversion devices, each device including a reactant gas chamber into which at least a first reactant gas is delivered via a conduit that isolates the first reactant gas from all other fluids by which the device operates, and an exterior;
• and
• an external environment fluidly interconnecting the exterior of each device, within which each device is exposed to a second reactant gas.

A system comprising at least one fuel-to-energy conversion device comprising a plurality of separately-manufactured components that are not isolated conduits, interconnected at inter-component junctions, at least one junction between non-conduit components defining a portion of an oxidant-fuel barrier.

44-45. (canceled)

A fuel-to-energy conversion device system comprising a plurality of interconnected, interoperative fuel-to-energy conversion devices each comprising an anode and a cathode;

• and
• a direct electrically-conductive pathway interconnecting the cathodes of at least a two devices with the anodes of at least two, different devices.

52-59. (canceled)