Solid oxide fuel cells (SOFCs) can convert chemical energy to electrical energy with high
efficiency and fuel flexibility.[1–3] The conventional Ni-based anode has low tolerance to
sulfur-contaminants in the fuel,[4] is vulnerable to deactivation by carbon build-up (coking)
from direct oxidation of hydrocarbon fuels,[5] and suffers volume instability on redox
cycling.[6, 7] Many methods have been introduced to modify the Ni-based anode to achieve
better sulfur tolerance and coking resistance. Replacing yttria-stabilized zirconia (YSZ) with …

Solid oxide fuel cells (SOFCs) can directly operate on hydrocarbon fuels such as natural
gas; however, the widely used nickel-based anodes face grand challenges such as coking,
sulfur poisoning, and redox instability. We report a novel double perovskite oxide Sr2Co0.
4Fe1. 2Mo0. 4O6− δ (SCFM) that possesses excellent redox reversibility and can be used
as both the cathode and the anode. When heat-treated at 900° C in a reducing environment,
double perovskite phase SCFM transforms into a composite of the Ruddlesden–Popper …