Lattice Strain with Stabilized Oxygen Vacancies Boosts Ceria for Robust Alkaline Hydrogen Evolution Outperforming Benchmark Pt.
basic_science · Level V
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- Record sourced from PubMed, PMID 38866382.
- Also identified by DOI 10.1002/adma.202405970.
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Abstract
Earth-abundant metal oxides are usually considered as stable but catalytically inert toward hydrogen evolution reaction (HER) due to their unfavorable hydrogen intermediate adsorption performance. Herein, a heavy rare earth (Y) and transition metal (Co) dual-doping induced lattice strain and oxygen vacancy stabilization strategy is proposed to boost CeO<sub>2</sub> toward robust alkaline HER. The induced lattice compression and increased oxygen vacancy (O<sub>v</sub>) concentration in CeO<sub>2</sub> synergistically improve the water dissociation on O<sub>v</sub> sites and sequential hydrogen adsorption at activated O<sub>v</sub>-neighboring sites, leading to significantly enhanced HER kinetics. Meanwhile, Y doping offers stabilization effect on O<sub>v</sub> by its stronger Y─O bonding over Ce─O, which endows the catalyst with excellent stability. The Y,Co-CeO<sub>2</sub> electrocatalyst exhibits an ultra-low HER overpotential (27 mV at 10 mA cm<sup>-2</sup>) and Tafel slope (48 mV dec<sup>-1</sup>), outperforming the benchmark Pt electrocatalyst. Moreover, the anion exchange membrane water electrolyzer incorporated with Y,Co-CeO<sub>2</sub> achieves excellent stability of 500 h under 600 mA cm<sup>-2</sup>. This synergistic lattice strain and oxygen vacancy stabilization strategy sheds new light on the rational development of efficient and stable oxide-based HER electrocatalysts.