Acknowledgments

The authors are grateful to Alan Attia for his help in setting up the photoelectrochemical apparatus and for his helpful discussions. The helpful discussions of William Tiedemann and Richard Johnson are also ap-preciated. Fred Graetz did the micro x-ray diffraction studies. Macro sample Raman spectra of reference ma-terials were collected bY Dr. Kazuo Nakamoto and his staff at Marquette University. MOLE Raman analyses were performed by Mr. Mark Anderson of Walter C. McCrone Associates, Incorporated. We gratefully ack-nowledge their contributions. The monochromator with scanner light source, light chopper, and lock-in amplifier used in the photoelectrochemistry were the property of the Solar Energy Research Institute. The research was supported entirely by Johnson Controls