Development of Oxygen Electrocatalysts for Alkaline Media.

摘要

The report presents the results of a Phase I feasibility study on the development of highly dispersed, supported gold electrocatalysts in alkaline media. A new technique for the preparation of supported gold electrocatalysts is discussed. Using transmission electron microscopy measurements, it has been demonstrated that particle sizes between 15 and 25A have been dispersed on carbon supports. Ring-disc electrochemical studies of oxygen reduction in alkaline media on single crystal faces ((111), (110), and (100)) and polycrstalline gold are presented. Results for polycrystalline platinum are also presented. A new ring-disc technique is discussed that removes inaccurate peroxide detection present in earlier studies of the oxygen reduction on gold. The results indicate that within 0.9 to 0.7V versus RHE, the reduction of oxygen on the (100) face of gold proceeds without producing peroxide. This does not occur on the other studied single crystal faces or on polycrystalline gold or platinum.