STUDY OF SURFACE CARBON FORMED ON WORKING ANODES OF SOFCs RUNNING ON METHANE

摘要

Surface carbon formed on Ni-cermet anodes in working SOFCs operating on methane has been characterised using Temperature Programmed Oxidation (TPO), and electrochemical measurements. It is found that the quantity of carbon deposited on the anode is significantly reduced by: lowering the operating temperature, increasing the steam/methane ratio, and introducing small quantities of additives such as molybdenum into the anode. TPO has revealed that three types of surface carbon species are formed during high temperature reaction of methane. Each of these species has been found to form at different rates on the Ni anode.