This study presents a highly efficient anion exchange membrane water electrolyzer (AEMWE) using chromium-doped amorphous metal oxide catalysts (FeCrOx, CoCrOx, and NiCrOx). The research focuses on enhancing the oxygen evolution reaction (OER) activity of these catalysts through the modulation of their electronic structure. The CoCrOx catalyst was found to achieve a high current density of 1.5 A cm⁻² at 2.1 V and maintain stability for over 120 hours with minimal voltage attenuation. The study utilized synchrotron radiation in-situ techniques to investigate the electronic structure and valence state changes of the catalysts during the OER process. The results showed that the CoCrOx catalyst exhibited superior OER performance compared to other catalysts, with a lower Tafel slope and reduced charge transfer resistance. The catalyst's performance was further validated through electrochemical measurements, demonstrating its potential for industrial applications. The study also highlights the importance of understanding the electronic structure and valence state changes of active metal sites in catalysts for improving their efficiency in water electrolysis. The findings provide valuable insights into the design of high-efficiency AEMWE systems and offer a general guideline for the development of advanced electrocatalysts.This study presents a highly efficient anion exchange membrane water electrolyzer (AEMWE) using chromium-doped amorphous metal oxide catalysts (FeCrOx, CoCrOx, and NiCrOx). The research focuses on enhancing the oxygen evolution reaction (OER) activity of these catalysts through the modulation of their electronic structure. The CoCrOx catalyst was found to achieve a high current density of 1.5 A cm⁻² at 2.1 V and maintain stability for over 120 hours with minimal voltage attenuation. The study utilized synchrotron radiation in-situ techniques to investigate the electronic structure and valence state changes of the catalysts during the OER process. The results showed that the CoCrOx catalyst exhibited superior OER performance compared to other catalysts, with a lower Tafel slope and reduced charge transfer resistance. The catalyst's performance was further validated through electrochemical measurements, demonstrating its potential for industrial applications. The study also highlights the importance of understanding the electronic structure and valence state changes of active metal sites in catalysts for improving their efficiency in water electrolysis. The findings provide valuable insights into the design of high-efficiency AEMWE systems and offer a general guideline for the development of advanced electrocatalysts.