The article delves into recent advancements in green hydrogen production technologies, focusing on electrolysis systems powered by renewables. Researchers are exploring different electrolysis methods, catalysts, and operational strategies to enhance the efficiency and sustainability of hydrogen production. Key areas of research highlighted include dynamic operation of water electrolyzers, membraneless electrolyzers, and decoupled electrochemical water-splitting systems. These technologies aim to improve the cost-effectiveness and environmental friendliness of hydrogen production. Moreover, the use of redox mediators and electron-coupled-proton buffers in water splitting processes is discussed as a promising approach to decouple hydrogen and oxygen evolution, thereby improving the overall efficiency of electrolysis. This strategy could potentially address challenges related to intermittency, gas purity, and energy conversion efficiency. Overall, the research in this field aims to advance hydrogen production technologies towards a more sustainable future, where green hydrogen plays a crucial role in transitioning towards cleaner energy sources and reducing carbon emissions.