Ni-Alloy Fuel Electrodes for Reversible Solid Oxide Cells

Abstract

Reversible solid oxide cells (r-SOCs) are devices that can operate efficiently in both fuel cell and electrolysis operation modes. Nickel is widely used as an anode in conventional solid oxide fuel cells (SOFCs), but this agglomerates due to redox cycling, leading to irreversible performance degradation, making it unsuitable for r-SOCs. Here, we apply alternative electrodes to r-SOCs, in which Ni-Co alloy functions as a catalyst and an electronic conductor, whilst Ce0.9Gd0.1O2 (GDC) functions as a mixed ionic-electronic conductor. The electrochemical performance of these Ni-Co-GDC electrodes and their reverse-operation durability in r-SOCs are evaluated, and the effect of varying the amount of Co is investigated, compared with conventional cermet fuel electrodes. These novel materials exhibit high electrochemical performance and durability against SOFC/SOEC reverse-operation cycling.

Toward High CO Selectivity and Oxidation Resistance Solid Oxide Electrolysis Cell with High-Entropy Alloy

“…The oxidation of nickel was thus obviously inhibited by sacrificial Fe . In addition, Ni–Co alloy also exhibits superior redox tolerance due to the formation of a dense oxide film, which prevents Ni oxidation . Cu is a highly active alternative to Ni, particularly due to its excellent resistance to carbon deposition and it contributes to the reduction of CO 2 in SOEC. , However, its low melting point restricts its widespread use in high-temperature applications.…”