Dynamic interactions between adsorbates and catalyst surfaces over long-term OER stability testing in acidic media

Li, Ruihan; Lu, Bingzhang; Edgington, Jane; Seitz, Linsey C.

doi:10.1016/j.jcat.2024.115387

Journal of Catalysis

2024

DOI: 10.1016/j.jcat.2024.115387

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Dynamic interactions between adsorbates and catalyst surfaces over long-term OER stability testing in acidic media

Ruihan Li,

Bingzhang Lu,

Jane Edgington

et al.

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Cited by 3 publications

References 39 publications

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Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Majie,

Guoxiang,

Qingwang

et al. 2024

Journal of Electroanalytical Chemistry

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Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Majie,

Guoxiang,

Qingwang

et al. 2024

Journal of Electroanalytical Chemistry

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Boron-Intercalation Engineering toward Defected 1T Phase-Rich MoB_xS_2–x-Supported IrO_x Clusters for Acidic OER

Huang,

Nie,

et al. 2024

Langmuir

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The construction of supported Ir-based catalysts can effectively reduce the amount of Ir and generate a synergistic effect that enhances the oxygen evolution reaction (OER) activity and stability, making it one of the effective solutions for optimizing acidic OER catalysts. However, most reported metal oxide supports suffer from poor acid resistance and low electrical conductivity, which are critical for the OER process. Herein, we synthesized a nanosheet-like defected 1T phase-rich MoB x S 2−x via a molten salt calcination process, during which the 1T phase was formed, and B was intercalated into MoS 2 to protect the 1T phase structure during annealing procedure. After the wet refluxing process, IrO x clusters were uniformly deposited on the surface of MoB x S 2−x to form IrO x @ MoB x S 2−x , which exhibited an overpotential of 168 mV at a current density of 10 mA cm −2 with an Ir loading amount of 25.8 wt %. By comparing the OER performance of IrO x @ MoB x S 2−x , IrO x @MoS 2 (Calcinated), and IrO x @MoS 2 , it is demonstrated that calcination and B intercalation of MoS 2 can significantly increase acidic OER performance. This work digs into the application of 1T-MoS 2 as an OER catalyst support, providing strategies for the phase and morphology control of 1T-MoS 2 .

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Quantification of electrochemically accessible iridium oxide surface area with mercury underpotential deposition

Edgington,

Vispute,

et al. 2024

Sci. Adv.

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Research drives development of sustainable electrocatalytic technologies, but efforts are hindered by inconsistent reporting of advances in catalytic performance. Iridium-based oxide catalysts are widely studied for electrocatalytic technologies, particularly for the oxygen evolution reaction (OER) for proton exchange membrane water electrolysis, but insufficient techniques for quantifying electrochemically accessible iridium active sites impede accurate assessment of intrinsic activity improvements. We develop mercury underpotential deposition and stripping as a reversible electrochemical adsorption process to robustly quantify iridium sites and consistently normalize OER performance of benchmark IrO x electrodes to a single intrinsic activity curve, where other commonly used normalization methods cannot. Through rigorous deconvolution of mercury redox and reproportionation reactions, we extract net monolayer deposition and stripping of mercury on iridium sites throughout testing using a rotating ring disk electrode. This technique is a transformative method to standardize OER performance across a wide range of iridium-based materials and quantify electrochemical iridium active sites.

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Dynamic interactions between adsorbates and catalyst surfaces over long-term OER stability testing in acidic media

Cited by 3 publications

References 39 publications

Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Boron-Intercalation Engineering toward Defected 1T Phase-Rich MoB_xS_2–x-Supported IrO_x Clusters for Acidic OER

Quantification of electrochemically accessible iridium oxide surface area with mercury underpotential deposition

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Dynamic interactions between adsorbates and catalyst surfaces over long-term OER stability testing in acidic media

Cited by 3 publications

References 39 publications

Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Cerium-doped construction of oxygen vacancies in IrO2 to promote acidic OER reaction

Boron-Intercalation Engineering toward Defected 1T Phase-Rich MoBxS2–x-Supported IrOx Clusters for Acidic OER

Quantification of electrochemically accessible iridium oxide surface area with mercury underpotential deposition

Contact Info

Product

Resources

About

Boron-Intercalation Engineering toward Defected 1T Phase-Rich MoB_xS_2–x-Supported IrO_x Clusters for Acidic OER