Water splitting for hydrogen production requires catalysts that are active for both the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). OER kinetics typically limit the efficiency of electrolysis, so improved OER catalysts are needed. This research has found an iridium doped nickel-iron based catalyst that is effective even at extremely low loadings. This low loading also allows the films to be transparent. This work shows an analysis of thin, transparent films of this catalyst. The stability, OER activity, transparency, loadings, composition, and efficiency in a solar water splitting device are all analyzed.