UAVs provide a niche market where energy capabilities matter more than price. This is an ideal platform for a new, so expensive, but potentially very beneficial, technology. Working in partnership with EADS IW provides aerospace engineering experience and an insight into customer requirements.
The process of making the individual mSOFCs is being considered in detail, with various changes to the “in-house” techniques previously used being suggested. Dip-coating was tested as an alternative to hand-painting the cathode layer for the cells; the results show proof-of-concept, although more work is needed to make this a viable alternative.
The power output and transient performance of the cells was also investigated, with promising results. It was shown that the hand-painted cells take less than half a second to adjust to a change in demanded current, without any overshooting of voltage.
The performance of individual cells on various hydrocarbon fuel compositions is being investigated, with humidification of the fuel and use of an inert buffer gas being considered. It has been concluded that a buffer gas will be needed, as the performance shows strong positive correlation with total gas flow rate. A small, six-cell module was made following the same design used previously in-house. This was tested for both power density and transient performance. The intention is to build up to a larger stack of around 100W, using a modular approach.