Activating Lattice Oxygen in High-Entropy LDH for Robust and Durable Water Oxidation Article Swipe
YOU?
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· 2023
· Open Access
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· DOI: https://doi.org/10.21203/rs.3.rs-2947613/v1
· OA: W4387209684
<title>Abstract</title> The oxygen evolution reaction (OER) is known to be a kinetic bottleneck for water splitting. Triggering the lattice oxygen oxidation mechanism (LOM) can break the theoretical limit of the conventional adsorbate evolution mechanism (AEM) and enhance the OER kinetics, yet the unsatisfied stability remains a grand challenge. Here, we report a novel high-entropy MnFeCoNiCu layered double hydroxide decorated with Au single atoms and O vacancies (AuSA-MnFeCoNiCu LDH), which not only displays a low overpotential of 213 mV at 10 mA cm<sup>−2</sup> and high mass activity of 732.925 A g−1 at 250 mV overpotential in 1.0 M KOH, but also delivers exceptional stability with 700 hours of continuous operation at ~100 mA cm<sup>−2</sup>. Combining the advanced spectroscopic techniques and density functional theory (DFT) calculations, it is demonstrated that the synergistic interaction between the incorporated Au single atoms and O vacancies leads to an upshift in the O 2p band and weakens the metal-O bond, thus triggering the LOM, reducing the energy barrier, and boosting the intrinsic activity.
