Visible‐NIR Light‐Driven Hydrogen Evolution from Ammonia Borane Using Defect‐Engineered Pd/WO3‐x Catalyst

Abstract Hydrogen (H 2 ) is a clean and promising energy carrier that can help develop sustainable energy solutions. Ammonia borane (AB) is considered an efficient hydrogen storage material because of its high hydrogen capacity, chemical stability, and controlled hydrogen release under ambient conditions. However, achieving efficient hydrogen release through AB hydrolysis requires effective catalysts. This study synthesized and evaluated Pd‐deposited oxygen‐deficient tungsten oxide (Pd/WO 3‐x ) for its catalytic efficiency in producing hydrogen from AB hydrolysis. The introduction of oxygen vacancies in WO 3 enhanced its electronic properties, improving charge separation and catalytic activity. Additionally, Pd nanoparticles facilitated faster hydrolysis by promoting efficient charge transfer and activation of AB molecules. The optimized Pd/WO 3‐x catalyst exhibited high catalytic efficiency with a reaction rate of 6.27 µmol min −1 , demonstrating its potential for sustainable hydrogen production. This study highlights the significance of oxygen vacancies and noble metal deposition in designing advanced catalysts for hydrogen energy applications. The findings contribute to the advancement of high‐performance and cost‐effective photocatalysts, paving the way for practical hydrogen storage and utilization in clean energy technologies.