Operando Reconstructed Molecule Fence to Stabilize NiFe-Based Oxygen Evolution Catalysts

摘要

Economical NiFe-based oxygen evolution reaction catalysts have recentlygained attention for their potential to accelerate green hydrogen productionthrough water electrolysis. However, their practical application is limited bydurability issues caused by the leaching of Fe sites during operation. Here anoperando reconstructed molecule fence, that is, sulfate-anchored aromaticring molecule, is proposed to inhibit the leaching of Fe atoms and improve thedurability of NiFe-based catalysts. With this design, the sulfate not onlyimmobilizes the aromatic ring as the protective layer to ensure long-termservice but also leaves space for beneficial site exposure and masspenetration. Molecule fence-protected NiFe-based catalysts exhibit excellentstability to withstand continuous high current densities of 100 mA cm~(?2) forover 2200 h and frequent current fluctuations and under start-up/shut-downevents for over 200 h. Furthermore, the implementation of optimized catalystsin industrial water electrolysis equipment operates steadily for over 100 h withan energy consumption of ≈4.18 kWh m~(?3) H_2.