Stabilizing Ni-O Through Bi Doping in LaNiO₃ Perovskite Oxide for Efficient Anion Exchange Membrane Water...

Enhancing the stability of anodic perovskite oxides is crucial for the development of anion exchange membrane water electrolyzers (AEMWEs). In this work, we reported a Bi-doping method to regulate the oxidation state of Ni and strengthen Ni-O interaction, thereby significantly enhancing the performance of LaNiO₃ for water oxidation. Rietveld refinement of X-ray diffraction results reveals that Bi incorporation shortens the Ni─O bond length, contracts the unit-cell volume of LaNiO₃, and alleviates metal (Ni) leaching, thus enhancing the structural stability of the material. In situ surface-enhanced infrared absorption spectroscopy, differential electrochemical mass spectrometry, and electrochemical quartz crystal microbalance analyses further demonstrate that Bi doping promotes the adsorption of *OOH intermediates and increases the contribution of the adsorbate evolution mechanism. The assembled AEMWE obtains a current density of 1 A cm^-2 at 1.81 V and 1.5 A cm^-2 a 1.88 V, respectively, and exhibits long-term stability for 600 h without any noticeable increase in voltage throughout the entire electrolysis process. Meanwhile, the La_0.9Bi_0.1NiO₃-based AEMWE shows excellent antifluctuation performance during intermittent electrolysis over 100 h without any voltage increase. This study highlights the critical role of structural modulation in boosting the water oxidation performance of perovskite oxide catalysts for AEMWE applications.