As a way to produce inexperienced hydrogen, water might be cut up up through electrocatalysis, powered by renewable sources reminiscent of solar or wind. A evaluate article reveals how fashionable X-ray sources reminiscent of BESSY II can advance the event of appropriate electrocatalysts. Particularly, X-ray absorption spectroscopy can be utilized to find out the energetic states of catalytically energetic supplies for the oxygen evolution response. This is a vital contribution to growing environment friendly catalysts from cheap and extensively accessible components.