ORIGINAL RESEARCH article
Front. Chem.
Sec. Electrochemistry
Volume 13 - 2025 | doi: 10.3389/fchem.2025.1635084
This article is part of the Research TopicHonoring Prof. Yong Ho Choa: Innovations in Energy and Environmental Sustainability in South KoreaView all articles
Electrodeposition of Nanocrystalline FeXCo1-X Thin Films from Choline Chloride-Urea Deep Eutectic Solvents
Provisionally accepted
- 1Xiamen Institute of Rare Earth Materials, Xiamen, China
- 2Institute for Advanced Engineering, Yongin, Republic of Korea
- 3Hanyang University, Seongdonggu, Republic of Korea
- 4University of Notre Dame, Notre Dame, United States
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FeₓCo₁₋ₓ thin films were electrodeposited from a choline-urea DES containing Fe³⁺ and Co²⁺ ions under ambient conditions. Anomalous codeposition occurred, with Fe preferentially depositing over Co. As the cathodic potential became more negative, film morphology shifted from smooth to nodular. XRD analysis showed iron oxide impurities at lower overpotentials and temperatures (e.g., < -0.9 V at 70 °C), while impurity-free, nanocrystalline Co₅₀Fe₅₀ films formed at higher temperatures (e.g., 130 °C). The films exhibited a bcc structure with (110) preferred orientation and grain sizes of 30-40 nm.
Keywords: Deep eutectic solvent, Choline chloride, Urea, electrodeposition, CoFe, soft magnetic materials
Received: 25 May 2025; Accepted: 25 Jul 2025.
Copyright: © 2025 Wu, Kim, Choa and Myung. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence:
Tingjun Wu, Xiamen Institute of Rare Earth Materials, Xiamen, China
Nosang Vincent Myung, University of Notre Dame, Notre Dame, United States
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