The proposed PEC method opens a new avenue towards the facile synthesis of this often "overlooked" U oxidation state. U(V) chemistry is important for elucidating the biogeochemical behaviors of U in the environment and understanding the properties of the f electrons of actinide ions . And a facile U(V) synthesis method is useful for assisting future studies on the U(V) chemistry. Additionally, because of its unique electronic structure , stable U(V) materials is also highly desired for photocatalysis, magnetism, and energy storage applications . However, due to fast disproportionation , U(V) species are usually very unstable . Attempts have been made by pioneers in synthesizing stable U(V), but the state-of-the-art methods are complicated and time-consuming, requiring the addition of organic ligands, heating, high pressure, and/or high voltage . To our best knowledge, this study is the first in successfully producing stable U(V) from aqueous media without adding organic ligands, under ambient conditions and in open air. This would significantly facilitate future studies on U(V) chemistry.