A study of SOFC-PEM hybrid systems

The benefits of a system combining high- and low-temperature fuel cell type s have been assessed using computer predictions. A high-temperature solid o xide fuel cell (SOFC) may be used to produce electricity and carry out fuel reforming simultaneously. The exhaust stream from an SOFC can be processed by shift reactors and supplied to a low-temperature polymer electrolyte me mbrane (PEM) cell. The overall efficiency predicted for the hybrid system i s shown to be significantly better than a Reformer-PEM system or an SOFC-on ly system. Approximate capital and running cost estimates also show signifi cant benefits compared to the other two systems. (C) 2000 Elsevier Science S.A. All rights reserved.