Wang, Jialu Kim, Hyunchul Lee, Hojin Ko, Young-Jin Han, Man Ho Kim, Woong Baik, Jeong Min Choi, Jae -Young Oh, Hyung-Suk Lee, Woong Hee 2024-01-19T09:32:07Z 2024-01-19T09:32:07Z 2023-04-13 2023-06 2211-2855 https://pubs.kist.re.kr/handle/201004/113713 Development of first-row transition-metal-based catalysts for oxygen evolution is a desirable goal due to the low cost and abundance of transition metals, relative to iridium. However, low stability of first-row transition metal catalysts in acidic electrolytes has impeded practical application. In this work, we proposed the role of Sb in metal oxide which enhance electrochemical stability in acid media. While a Co-Fe mixed oxide exhibited poor stability in acid, a FeCoSbOx electrode demonstrate superior stability of over 70 h under the same conditions. In-situ/Operando analysis results suggest that distortion occurred in the FeCoOx electrode under acidic conditions for oxygen evolution, while the structure of the FeCoSbOx electrode was maintained. As compared to an SbOx electrode, Sb in an FeCoSbOx electrode had a higher oxidation state and shorter lattice distance, indicating strong Sb-O bonding. Given the stronger oxide bond, we anticipated that incorporation of Sb would enhance stability in acidic media not only via greater thermodynamic stability but by inhibiting distortion during the reaction. A more stable structure prevents participation by lattice oxygen, resulting in enhanced electrode stability. This demonstration of a stabilizing structural element in a transition metal oxide offers new principles for designing electrocatalysts that are stable in acidic media. English Elsevier BV Sb incorporated into oxides enhances stability in acid during the oxygen evolution reaction by inhibiting structural distortion Article 10.1016/j.nanoen.2023.108355 1 Nano Energy, v.110 Nano Energy 110 Y scie scopus 000958790600001 2-s2.0-85150276283 Chemistry, Physical Nanoscience & Nanotechnology Materials Science, Multidisciplinary Physics, Applied Chemistry Science & Technology - Other Topics Materials Science Physics Article REACTION OER OXIDATION CATALYSTS IRIDIUM WATER NANOPARTICLES Transition -metal Acidic conditions Enhanced stability In-situ Operando studies Oxygen evolution reaction