biostudies-literatureUnknown13Wu TFe_xCo_1-x thin films were electrodeposited from a choline-urea deep eutectic solvent (DES) containing Fe³⁺ and Co²⁺ ions under ambient conditions. Anomalous co-deposition was observed, with Fe preferentially depositing over Co. With higher cathodic potential, the film's morphology shifted from smooth to nodular. X-ray diffraction (XRD) analysis showed iron oxide impurities at lower overpotential and temperatures (e.g., <-0.9 V at 70 °C), while impurity-free, nanocrystalline Co₅₀Fe₅₀ films had formed at higher temperatures (e.g., 130 °C). The films exhibited a body-centered cubic (BCC) structure with (110) preferred orientation and grain sizes of 30 nm-40 nm.Frontiers in chemistry1635084https://www.ebi.ac.uk/biostudies/studies/S-EPMC12460894biostudies-literatureElectrodeposition of nanocrystalline Fe&lt;sub&gt;X&lt;/sub&gt;Co&lt;sub&gt;1-X&lt;/sub&gt; thin films from choline chloride-urea deep eutectic solvents.PMC12460894Myung NVChoa YHWu TKim JfalseElectrodeposition of nanocrystalline Fe&lt;sub&gt;X&lt;/sub&gt;Co&lt;sub&gt;1-X&lt;/sub&gt; thin films from choline chloride-urea deep eutectic solvents.Fe_xCo_1-x thin films were electrodeposited from a choline-urea deep eutectic solvent (DES) containing Fe³⁺ and Co²⁺ ions under ambient conditions. Anomalous co-deposition was observed, with Fe preferentially depositing over Co. With higher cathodic potential, the film's morphology shifted from smooth to nodular. X-ray diffraction (XRD) analysis showed iron oxide impurities at lower overpotential and temperatures (e.g., <-0.9 V at 70 °C), while impurity-free, nanocrystalline Co₅₀Fe₅₀ films had formed at higher temperatures (e.g., 130 °C). The films exhibited a body-centered cubic (BCC) structure with (110) preferred orientation and grain sizes of 30 nm-40 nm.2025-01-01T00:00:00Z20252026-06-03T22:44:05.258Z2026-05-31T03:06:21.21ZS-EPMC124608944101970610.3389/fchem.2025.1635084