The addition of aluminium oxide to the nickel anodes of a molten carbonate fuel cell

Impedance Analysis of the Hydrogen Oxidation Reaction in Molten Li/K Carbonate at Nickel Electrodes

“…3 to describe his experimental results. This equivalent circuit confirms the equality of reaction rate of reactions [2] and [3] and herewith the applicability of the "linked mechanism" approach. The exchange current density calculated from the charge transfer resistance was 105 mA cm -2.…”

“…o The assumption that OH-ions are immobilized and reaction steps [2]- [4] take place consecutively might be incorrect, since OH-ions are relatively stable in the melt and are also present in appreciable amounts according to the hy-~ drolysis equilibrium [5], which has an equilibrium constant of 5.6 • 10 z in the Li~COJK2CO3 [62/38 mole percent (m/o)] eutectic melt at 923 K (5). From theoretical considerations, Lu and Selman (3) suggested that treatment of [3] and [4] as two simultaneous charge transfer reactions might be a better approach to reality.…”

“…From theoretical considerations, Lu and Selman (3) suggested that treatment of [3] and [4] as two simultaneous charge transfer reactions might be a better approach to reality. Recently, a modification of the second mechanism was proposed by Bienasz (4), who assumed the adsorption step [2] and the charge transfer [3] step to have a comparable rate---the "linked mechanism" approach. The aim of our research is to obtain additional information on the reaction path and kinetics of the fuel oxidation reaction on nickel, using ac impedance spectroscopy.…”

“…In the last decade the kinetics and mechanism of the hydrogen oxidation reaction in molten carbonate fuel cells have been studied by several authors (1)(2)(3)(4). The anodic overall reaction is H2 + CO~ 2-~-CO2 + H~O + 2e- [1] At present two possible mechanisms for this reaction are being considered.…”

Evaluation of Ni–Ni3Al(5wt.%)–Al(3wt.%) as an anode electrode for molten carbonate fuel cell

“…Therefore, the development and research for a highly creep-and sintering-resistant anode substituted for a pure Ni anode electrode have been performed. The methods for addition of Cr, Al, Mg, Cu and Zr to pure Ni, which easily form the oxide with Ni, and for addition of oxide such as ␣-Al 2 O 3 , LiAlO 2 to Ni, have been presented [4][5][6][7][8]. Recently, papers for the coating or electro deposition on the surface of the Ni anode electrode with Al and Nb have also been presented [9,10].…”