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Boron-Tuned Covalency Enables Durable and High-Performance Perovskite OER Catalysts
Zhirui Fu1, Yucheng Hang1, Rong Ma1
1UNIST-NUIST Environment and Energy Jointed Lab (UNNU), School of Environment Science and Technology, Nanjing University of Information Science and Technology, Nanjing, P. R. China.
None:
Perovskite catalysts show great promise for the oxygen evolution reaction (OER) but still face challenges in activity and stability. Here, we report boron incorporation into Sr2(FeCo0.6Mo0.4)O5+δ to tailor the Co-O-Fe covalency and electronic states, delivering 300 mV at 10 mA cm- 2 and a 67 mV dec- 1 Tafel slope with > 140 h durability in 1 m KOH. Spectroscopy shows lowered Co/Fe valences and an increased fraction of lattice oxygen, while Density Functional Theory(DFT) (ELF/DOS/free-energy) indicates strengthened Transition Metal-Oxygen (TM─O) bonding and reduced reaction barriers. These findings support a shift toward an adsorbate evolution like pathway with suppressed lattice oxygen participation, rationalizing both the enhanced activity and robustness. Flexible Zn air batteries using Sr2(FeCo0.6Mo0.4)0.9B0.1O5+δ exhibit lower charging overpotentials and superior cycling stability than Pt/C+RuO2, highlighting device relevance. This work establishes metalloid doping enabled covalency engineering as a general strategy to boost OER performance and stability in perovskites.
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