A fuel cell system includes a fuel cell stack, a reformer which is
thermally integrated with the fuel cell stack. The system may also
include a combustor which is thermally integrated with the reformer. The
reformer is a reformation catalyst containing channel bounded by at least
one corrugated foil wall. The reformer is adapted to reform a hydrocarbon
fuel to a hydrogen containing reaction product and to provide the
reaction product to the fuel cell stack.