Ru‐Doping‐Induced Dual‐Functionality in La0.6Sr0.4Co0.2Fe0.8O3‐δ: Enhancing Efficient Multi‐Fuels Oxidation and Suppressing Sr Segregation for Robust Symmetric Solid Oxide Cells

Why It Matters

The dual‑functionality electrode simplifies solid‑oxide system design and delivers power densities comparable to dedicated anodes and cathodes, accelerating commercial adoption of reversible fuel‑cell technologies.

Key Takeaways

• Ru-doped LSRCF exsolves CoFeRu nanoalloys during fuel operation
• Nanoalloy interfaces boost propane oxidation and resist coking
• Ru suppresses Sr segregation, improving oxygen reduction stability
• Cell reaches 1.23 W cm⁻² on propane at 850 °C
• CO₂ electrolysis delivers 3.39 A cm⁻² at 1.6 V, 850 °C

Pulse Analysis

Symmetric solid‑oxide cells (SSOCs) promise a streamlined architecture by using the same electrode material for both fuel oxidation and oxygen reduction. Historically, the lack of a single material that can sustain high catalytic activity on both sides has limited SSOC deployment, as conventional anodes suffer from coking while cathodes are prone to Sr segregation and degradation under redox cycling. Overcoming these twin challenges is critical for achieving reversible operation in power‑to‑gas and energy‑storage applications.

The breakthrough comes from integrating Ru into a La‑Sr‑Co‑Fe perovskite while deliberately creating A‑site deficiency. This chemistry triggers in‑situ exsolution of CoFeRu nano‑alloys when the electrode is exposed to reducing fuels. The resulting metal‑oxide heterointerfaces dramatically lower the activation barrier for propane dehydrogenation, as confirmed by density‑functional theory, and provide a self‑cleaning surface that resists carbon buildup. Simultaneously, Ru atoms anchored in the lattice raise the migration energy for Sr, curbing the formation of insulating Sr‑rich phases that would otherwise impair oxygen reduction. The combined effect yields power densities of 940 mW cm⁻² on hydrogen, 1 230 mW cm⁻² on propane, and a CO₂ electrolysis current of 3 390 mA cm⁻² at 850 °C.

For industry, this dual‑functionality electrode translates into fewer components, lower balance‑of‑plant costs, and longer stack lifetimes. The demonstrated tolerance to sulfur and coke means the technology can operate on diverse, low‑grade fuels such as biogas or refinery off‑gases without extensive pretreatment. As utilities and renewable‑energy firms seek flexible, high‑efficiency conversion platforms, LSRCF‑based SSOCs could become a cornerstone of next‑generation distributed power and carbon‑neutral fuel production, provided scale‑up and manufacturing challenges are addressed in forthcoming pilot programs.