Journal
SCIENCE ADVANCES
Volume 7, Issue 2, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abc7323
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0018029]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- DOE Office of Science [DE-AC0206CH11357]
- NSF [NNCI-1542101, ECCS-1542081, DMR-1539918, DMR-1709255]
- Oregon State University
- NSF Graduate Research Fellowship [DGE-1650441]
- NSF MRSEC program [DMR-1719875]
- Fonds de la Recherche Scientifique-FNRS [29120589]
- Walloon Region [1117545]
- Sloan Research Fellowship
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Investigated the interfacial transformation of the SrIrO3 OER electrocatalyst and its structural evolution, revealing that the structural reorganization facilitated by coupled ionic diffusions is essential to the disordered structure of the SrIrO3 electrocatalyst.
The use of renewable electricity to prepare materials and fuels from abundant molecules offers a tantalizing opportunity to address concerns over energy and materials sustainability. The oxygen evolution reaction (OER) is integral to nearly all material and fuel electrosyntheses. However, very little is known about the structural evolution of the OER electrocatalyst, especially the amorphous layer that forms from the crystalline structure. Here, we investigate the interfacial transformation of the SrIrO3 OER electrocatalyst. The SrIrO(3 )amorphization is initiated by the lattice oxygen redox, a step that allows Sr2+ to diffuse and O2- to reorganize the SrIrO(3 )structure. This activation turns SrIrO3 into a highly disordered Ir octahedral network with Ir square-planar motif. The final SryIrOx exhibits a greater degree of disorder than IrOx made from other processing methods. Our results demonstrate that the structural reorganization facilitated by coupled ionic diffusions is essential to the disordered structure of the SrIrO3 electrocatalyst.
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