Developing robust and highly efficient electrocatalysts for oxygen evolution reaction (OER) is critical for renewable, secure, and emission‐free energy technologies. Perovskite Ba0.5Sr0.5Co0.8Fe0.2O3‐δ (BSCF) has emerged as a promising OER electrocatalyst with desirable intrinsic activity. Inspired by the factor that substituting in transition‐metal sublattice of the perovskite can further optimize the OER activity, herein, nickel‐substituted BSCF is adopted, that is, Ba0.5Sr0.5Co0.8‐xFe0.2NixO3‐δ (x = 0.05, 0.1, 0.2, denoted as BSCFNx, x = 5, 10, 20, respectively), as efficient and stable OER catalysts in alkaline solution. The phase structure, microchemistry, oxygen vacancy, and electrochemical activity of such samples are well‐investigated. Endowed with an overpotential of only 278 mV at 10 mA cm−2 and a Tafel slope of merely 47.98 mV dec−1, BSCFN20 exhibits the optimum OER activity. When constructing a two‐electrode cell with BSCFN20 as anode and Pt/C as cathode (BSCFN20||Pt/C) for water splitting, it only requires a voltage of 1.63 V to achieve 50 mA cm−2, and the BSCFN20||Pt/C remains stable within 80 h at 10 mA cm−2, superior to the state‐of‐the‐art RuO2||Pt/C counterpart. This work provides a feasible strategy for designing stable and highly active perovskite electrocatalysts for future energy storage and conversion.
Summary
The rational design of effective and specific catalysts for oxygen evolution reaction (OER) is of vital importance for the implementation of electrochemical water oxidation as a sustainable route to produce hydrogen. Perovskite oxides have attracted considerable interests in view of the highly tunable structural, electronic, and catalytic properties associated with their compositions. Herein, an efficient Sn‐incorporated nominal perovskite nanocomposite, SrCo0.7Sn0.3O3−δ (SCS), derived from a facile one‐pot self‐assembly process, is designed as an outstanding electrocatalyst to catalyze OER in alkaline conditions. Benefiting from the unique structure, increased active oxygen intermediates, and favorable electrical conductivity, the optimized SCS exhibits superior OER electrocatalytic performance, including low overpotential of only 309 mV at 10 mA cm−2, fast kinetics with a small Tafel slope of 56 mV dec−1, and 72‐fold improvement in mass activity and 108‐fold enhancement in specific activity relative to the pristine SrCoO3−δ catalyst. The SCS catalyst also demonstrates excellent OER durability with negligible potential fluctuation for 30 hours continuous operation. This work highlights a promising strategy to develop high‐performance perovskite nanocomposites to perform efficient OER electrocatalysis.
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