نبذة مختصرة : The efficiency of alkaline water electrolyzers is limited by the oxygen evolution reaction (OER). The design of improved OER catalysts requires understanding of material changes induced by the electrolyte under oxidizing potentials. We compare four Ni-based thin-film precatalysts—Ni, NiO, Ni(OH)2, and NiSx—in 0.1 M KOH with and without Fe impurities. Precatalyst conversion to the active oxyhydroxide catalysts and their OER performance are induced and followed using cyclic voltammetry. Without Fe electrolyte impurities, the precatalysts convert at different rates to a similar, modestly active NiOOH catalyst. Added Fe impurities are incorporated concurrently with the oxyhydroxide formation leading to active Ni1-xFexOOH catalysts. The NiSx and Ni(OH)2 precatalysts rapidly convert to oxyhydroxides both with and without Fe, while conversion of Ni and especially NiO is slowed down by Fe impurities. Choice of the precatalyst and presence of Fe impurities are key factors in designing active Ni1-xFexOOH OER catalysts for electrolyzers. ; Peer reviewed
Relation: M.M. acknowledges a postdoctoral fellowship of the Research Council of Finland (decision 347100). J.S. acknowledges the Leopoldina postdoctoral fellowship program (grant number LPDS 2022-02 ) of the German National Academy of Sciences Leopoldina and the Postdoc.Mobility fellowship program (grant number P500PN_210769 ) of the Swiss National Science Foundation . This research was funded in part by the Swiss National Science Foundation ( P500PN_210769 ). J.S., T.F.J., M.B.S., and S.F.B. acknowledge financial support from the US Department of Energy , Office of Basic Energy Sciences Chemical Sciences , Geosciences , and Biosciences Division , Catalysis Science Program to the SUNCAT Center for Interface Science and Catalysis . G.D\u2019A. acknowledges support from Wallenberg Foundation Postdoctoral Scholarship Program (grant number KAW 2021.0342 ). Part of this work (SEM and XPS) was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS-2026822 . Part of this work (ALD) used ALD Center Finland research infrastructure. Dr. Guangchao Li is acknowledged for ICP-OES measurements. M.M. acknowledges a postdoctoral fellowship of the Research Council of Finland (decision 347100). J.S. acknowledges the Leopoldina postdoctoral fellowship program (grant number LPDS 2022-02) of the German National Academy of Sciences Leopoldina and the Postdoc.Mobility fellowship program (grant number P500PN_210769) of the Swiss National Science Foundation. This research was funded in part by the Swiss National Science Foundation (P500PN_210769). J.S., T.F.J., M.B.S., and S.F.B. acknowledge financial support from the US Department of Energy, Office of Basic Energy Sciences Chemical Sciences, Geosciences, and Biosciences Division, Catalysis Science Program to the SUNCAT Center for Interface Science and Catalysis. G.D'A. acknowledges support from Wallenberg Foundation Postdoctoral Scholarship Program (grant number KAW 2021.0342). Part of this work (SEM and XPS) was performed at the Stanford Nano Shared Facilities (SNSF), supported by the National Science Foundation under award ECCS-2026822. Part of this work (ALD) used ALD Center Finland research infrastructure. Dr. Guangchao Li is acknowledged for ICP-OES measurements.; http://hdl.handle.net/10138/588516; 85209550603; 001361648800001
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