Single‐Atom Enables Reverse Hydrogen Spillover for High‐Performance Protonic Ceramic Fuel Cells
Sunce Zhao, Wenjia Ma, Beibei He, Yihan Ling, Yonglong Huang, Feng Hu, Zhu Shu, Ling Zhao
Abstract
Abstract Protonic ceramic fuel cells (PCFCs) offer a promising avenue for sustainable energy conversion, however, their commercial potential is hindered by sluggish proton‐involved oxygen reduction reaction (P‐ORR) kinetics and inadequate durability of cathode materials. Here, a novel single‐atom Ru anchor on BaCe 0.125 Fe 0.875 O 3−δ (BCF) perovskite, synthesized by a facile and scalable solid‐state approach, as a potential cathode for PCFCs is reported. Theoretical and experimental analyses demonstrate that the single‐atom Ru on BCF, characterized by a unique 4‐coordinate Ru‐O‐Fe configuration, not only induces reverse hydrogen spillover but also acts as an active site for P‐ORR. The application of the optimized 2Ru‐BCF (2 wt.% Ru) cathode in a single cell delivers an exceptional peak power density of 1.78 W cm −2 at 700 °C, along with excellent operational stability over 200 h. These findings provide new insights into single‐atom engineering, advancing the commercial viability of PCFCs.