Strain Regulation to Optimize the Acidic Water Oxidation Performance of Atomic-Layer IrO x .

Autor: Meng G; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China.; Department of Chemistry, Tsinghua University, Beijing, 100084, China., Sun W; College of Science, China Agricultural University, Beijing, 100193, China., Mon AA; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China., Wu X; Petrochemical Research Institute of PetroChina, Beijing, 100195, China., Xia L; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China., Han A; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China., Wang Y; Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai, 201800, China., Zhuang Z; State Key Lab of Organic-Inorganic Composites and Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China., Liu J; State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, 100029, China., Wang D; Department of Chemistry, Tsinghua University, Beijing, 100084, China., Li Y; Department of Chemistry, Tsinghua University, Beijing, 100084, China.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2019 Sep; Vol. 31 (37), pp. e1903616. Date of Electronic Publication: 2019 Aug 02.
DOI: 10.1002/adma.201903616
Abstrakt: Strain regulation has become an important strategy to tune the surface chemistry and optimize the catalytic performance of nanocatalysts. Herein, the construction of atomic-layer IrO x on IrCo nanodendrites with tunable IrO bond length by compressive strain effect for oxygen evolution reaction (OER) in acidic environment is demonstrated. Evidenced from in situ extended X-ray absorption fine structure, it is shown that the compressive strain of the IrO x layer on the IrCo nanodendrites decreases gradually from 2.51% to the unstrained state with atomic layer growth (from ≈2 to ≈9 atomic layers of IrO x ), resulting in the variation of the IrO bond length from shortened 1.94 Å to normal 1.99 Å. The ≈3 atomic-layer IrO x on IrCo nanodendrites with an IrO bond length of 1.96 Å (1.51% strain) exhibits the optimal OER activity compared to the higher-strained (2.51%, ≈2 atomic-layer IrO x ) and unstrained (>6 atomic-layer IrO x ) counterparts, with an overpotential of only 247 mV to achieve a current density of 10 mA cm -2 . Density functional theory calculations reveal that the precisely tuned compressive strain effect balances the adsorbate-substrate interaction and facilitates the rate-determining step to form HOO*, thus assuring the best performance of the three atomic-layer IrO x for OER.
(© 2019 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.)
Databáze: MEDLINE
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