Toward Understanding Carboxylate Group Contributions to Mn Oxide Catalysts in the Oxygen-Evolution Reaction

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 4, 2025

In contrast to the previous assumption that manganese (hydr)oxides, in absence of other metal ions, exhibit high overpotentials for catalyzing oxygen-evolution reaction (OER) under neutral conditions, this study uncovers a more nuanced behavior. We demonstrate layered oxides, when treated with carboxylate groups, OER activity at Mn(III) Mn(IV) oxidation peak following charge accumulation. Upon addition poly(acrylic acid) (PAA), transition occurs lower potential. While current density remains modest, is observed an extraordinarily low overpotential just 20 mV phosphate buffer solution. present detailed mechanistic proposal low-overpotential regime, focusing on and surrounding environment. Oxygen measurements reveal applied potential 1.25 V, turnover frequency (TOF) increases from 2.6 × 10–2 s–1 prior PAA treatment 4.7 post-treatment. However, Tafel slope 384.76 mV/decade before 414.30 after treatment. The reduction attributed complex interaction between process accumulation, mirroring key mechanisms natural systems such as OEC photosystem II (PSII). This interplay likely facilitates system, highlighting relevance these bioinspired processes designing efficient electrocatalysts OER. These findings provide important insights development highly robust water splitting, significant implications future energy conversion storage technologies. By emulating Mn redox PSII, our work paves way design effective catalysts operate minimal loss, advancing sustainable solutions.

Language: Английский

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Oxygen-Evolution Reaction on the Surface of Layered Manganese Oxide under Neutral Conditions: A Bioinspired Strategy Achieving Ultra-Low Overpotential

ACS Applied Energy Materials, Journal Year: 2025, Volume and Issue: unknown

Published: March 1, 2025

Language: Английский

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In-situ Raman analysis of ethanol electro-oxidation on Pd-based MnO2 hollow nanoflower catalysts

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 126, P. 336 - 345

Published: April 10, 2025

Language: Английский

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Synergistic Ternary Catalysis: NiCo-LDH/Ni₃S₂/Co₉S₈@NiFe-LDH-Ov/NF Composite Catalyst for High-Efficiency HER/OER Bifunctional Water Splitting

Journal of Alloys and Compounds, Journal Year: 2025, Volume and Issue: unknown, P. 180462 - 180462

Published: April 1, 2025

Language: Английский

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