Self-assembled Ruddlesden–Popper/perovskite hybrid with lattice-oxygen activation as a superior oxygen evolution electrocatalyst

Yinlong Zhu, Qian Lin, Zhiwei Hu, Yubo Chen, Yichun Yin, Hassan A. Tahini, Hong-Ji Lin, Chien-Te Chen, Xiwang Zhang, Zongping Shao, Huanting Wang

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1 Citation (Scopus)

Abstract

The oxygen evolution reaction (OER) is pivotal in multiple gas-involved energy conversion technologies, such as water splitting, rechargeable metal–air batteries, and CO2/N2 electrolysis. Emerging anion-redox chemistry provides exciting opportunities for boosting catalytic activity, and thus mastering lattice-oxygen activation of metal oxides and identifying the origins are crucial for the development of advanced catalysts. Here, a strategy to activate surface lattice-oxygen sites for OER catalysis via constructing a Ruddlesden–Popper/perovskite hybrid, which is prepared by a facile one-pot self-assembly method, is developed. As a proof-of-concept, the unique hybrid catalyst (RP/P-LSCF) consists of a dominated Ruddlesden–Popper phase LaSr3Co1.5Fe1.5O10-δ (RP-LSCF) and second perovskite phase La0.25Sr0.75Co0.5Fe0.5O3-δ (P-LSCF), displaying exceptional OER activity. The RP/P-LSCF achieves 10 mA cm−2 at a low overpotential of only 324 mV in 0.1 m KOH, surpassing the benchmark RuO2 and various state-of-the-art metal oxides ever reported for OER, while showing significantly higher activity and stability than single RP-LSCF oxide. The high catalytic performance for RP/P-LSCF is attributed to the strong metal–oxygen covalency and high oxygen-ion diffusion rate resulting from the phase mixture, which likely triggers the surface lattice-oxygen activation to participate in OER. The success of Ruddlesden–Popper/perovskite hybrid construction creates a new direction to design advanced catalysts for various energy applications.

Original languageEnglish
Number of pages7
JournalSmall
Volume16
Issue number20
DOIs
Publication statusPublished - 22 May 2020

Keywords

  • electronic structure
  • hybrid construction
  • lattice-oxygen activation
  • oxygen evolution reaction
  • synergistic effects

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