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Enhancing long-term stability in oxygen evolution through in-situ etching of phase segregation Fe-Mn oxide.

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Title: Enhancing long-term stability in oxygen evolution through in-situ etching of phase segregation Fe-Mn oxide.
Authors: Sun, Mao1 (AUTHOR), Zhai, Yueming1 (AUTHOR) yueming@whu.edu.cn, Wang, Jike1 (AUTHOR) Jike.wang@whu.edu.cn
Source: Applied Catalysis B: Environment & Energy. Dec2024, Vol. 358, pN.PAG-N.PAG. 1p.
Subjects: Oxygen evolution reactions, Surface segregation, Energy conversion, Etching, Overpotential
Abstract: Phase segregation, induced by the dynamic evolution of the electrode surface during operation, impacts the stability of catalysts involved in the energy conversion process, specifically in the oxygen evolution reaction (OER). To address this issue, we propose an innovative electrochemical etching method for the in-situ elimination of the surface phase segregation in FeMn layered double oxides (FeMn LDO). The Mn-rich structure on the FeMn LDO surface, which undergoes a transition process from Mn 3 O 4 to MnO 4 − , can be eliminated during the etching process, thereby restoring the OER performance of the catalyst. The resultant electrode shows a low overpotential of 245 mV at 10 mA cm−2 and robust durability of 1250 h at 100 mA cm−2, marking one of the highest stabilities among transition-metal based OER catalysts. Our insights into the electrode surface evolution provide valuable guidance for designing stable electrode materials. [Display omitted] • An electrochemical etching strategy is used to mitigate phase segregation in the FeMn LDO catalyst. • The FeMn LDO catalyst exhibits a remarkable durability of 1250 h at 100 mA cm−2. • Findings provide insights into the design of efficient and stable electrode materials. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Phase segregation, induced by the dynamic evolution of the electrode surface during operation, impacts the stability of catalysts involved in the energy conversion process, specifically in the oxygen evolution reaction (OER). To address this issue, we propose an innovative electrochemical etching method for the in-situ elimination of the surface phase segregation in FeMn layered double oxides (FeMn LDO). The Mn-rich structure on the FeMn LDO surface, which undergoes a transition process from Mn 3 O 4 to MnO 4 − , can be eliminated during the etching process, thereby restoring the OER performance of the catalyst. The resultant electrode shows a low overpotential of 245 mV at 10 mA cm−2 and robust durability of 1250 h at 100 mA cm−2, marking one of the highest stabilities among transition-metal based OER catalysts. Our insights into the electrode surface evolution provide valuable guidance for designing stable electrode materials. [Display omitted] • An electrochemical etching strategy is used to mitigate phase segregation in the FeMn LDO catalyst. • The FeMn LDO catalyst exhibits a remarkable durability of 1250 h at 100 mA cm−2. • Findings provide insights into the design of efficient and stable electrode materials. [ABSTRACT FROM AUTHOR]
ISSN:09263373
DOI:10.1016/j.apcatb.2024.124453