Effect of alloying elements on the copper-base anode for molten carbonate fuel cells

摘要

The effects of aluminium and chromium on the structural stability and the electrochemical performance of porous Cu-Ni anodes for the molten carbonate fuel cell (MCFC) are examined in a simulated MCFC anode environment (923 K, 80% H_2-20% CO_2). The addition of aluminium and chromium inhibits porous Cu-Ni anodes from being sintered because of the formation of aluminium oxide and chromium oxide on their surfaces. Electrochemical performance is evaluated in terms of anodic polarization in a half-cell system. At an anodic overpotential of 100 mV, the current density for H_2 oxidation of the Cu-Ni-Al anodes is about 85 mA cm~(-2). The current densities of the Ca-Ni and Cu-Ni-Cr anodes were, however, 114 and 112 mA cm~(-2) respectively.