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- W2912609836 abstract "Deterioration of intrinsic activity of Ir-based electrocatalysts during the oxygen evolution reaction (OER) has received much less attention compared to the metal dissolution. Combining chronoamperometry with operando electrochemical impedance spectroscopy and cyclic voltammetry, we show that the deactivation via active site phase transformation from hydrous Ir oxide/hydroxide into anhydrous Ir oxide, is concomitant with the dissolution-induced loss of electrochemical surface area. The relative contributions from these deactivation paths were found to be structure sensitive. Systematic evaluation of different Ir-based catalysts at identical electro-oxidative conditions showed that hydrous IrOx with structural short-range order exhibited an initial minor degradation of intrinsic activity but the most significant dissolution after the extended stability test. In contrast, newly-reported Ir superstructures with higher crystallinity and larger proportion of low-index crystal terminations exhibited enhanced resistance to dissolution but a major degradation of intrinsic activity, as the performance-relevant hydrous oxide/hydroxide species developed only on the surface of metallic Ir. The Ir/IrOx catalyst regeneration was demonstrated." @default.
- W2912609836 created "2019-02-21" @default.
- W2912609836 creator A5047789617 @default.
- W2912609836 creator A5070159408 @default.
- W2912609836 creator A5083901788 @default.
- W2912609836 creator A5088396429 @default.
- W2912609836 date "2019-03-01" @default.
- W2912609836 modified "2023-10-14" @default.
- W2912609836 title "Decoupling structure-sensitive deactivation mechanisms of Ir/IrOx electrocatalysts toward oxygen evolution reaction" @default.
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- W2912609836 doi "https://doi.org/10.1016/j.jcat.2019.01.018" @default.
- W2912609836 hasPublicationYear "2019" @default.
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