期刊
SMALL
卷 16, 期 20, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/smll.202001204
关键词
electronic structure; hybrid construction; lattice-oxygen activation; oxygen evolution reaction; synergistic effects
类别
资金
- Australian Research Council [DE190100005]
- Max Planck-POSTECH-Hsinchu Center for Complex Phase Materials
- Monash X-Ray Platform (MXP)
- Australian Research Council [DE190100005] Funding Source: Australian Research Council
The oxygen evolution reaction (OER) is pivotal in multiple gas-involved energy conversion technologies, such as water splitting, rechargeable metal-air batteries, and CO2/N-2 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-delta (RP-LSCF) and second perovskite phase La0.25Sr0.75Co0.5Fe0.5O3-delta (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.
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