Structurally-Distorted RuIr-Based Nanoframes for Long-Duration Oxygen Evolution Catalysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 37620729.
- Also identified by DOI 10.1002/adma.202305659.
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Abstract
Oxygen evolution reaction (OER) plays a key role in proton exchange membrane water electrolysis (PEMWE), yet the electrocatalysts still suffer from the disadvantages of low activity and poor stability in acidic conditions. Here, a new class of CdRu<sub>2</sub> IrO<sub>x</sub> nanoframes with distorted structure for acidic OER is successfully fabricated. Impressively, CdRu<sub>2</sub> IrO<sub>x</sub> displays an ultralow overpotential of 189 mV and an ultralong stability of 1500 h at 10 mA cm⁻<sup>2</sup> toward OER in 0.5 M H<sub>2</sub> SO<sub>4</sub> . Moreover, a PEMWE using the distorted CdRu<sub>2</sub> IrO<sub>x</sub> can be steadily operated at 0.1 A cm⁻<sup>2</sup> for 90 h. Microstructural analyses and X-ray absorption spectroscopy (XAS) demonstrate that the synergy between Ru and Ir in CdRu<sub>2</sub> IrO<sub>x</sub> induces the distortion of Ru-O, Ir-O, and Ru-M (M = Ru, Ir) bonds. In situ XAS indicates that the applied potential leads to the deformation octahedral structure of RuO<sub>x</sub> /IrO<sub>x</sub> and the formation of stable Ru<sup>5+</sup> species for OER. Theoretical calculations also reveal that the distorted structures can reduce the energy barrier of rate-limiting step during OER. This work provides an efficient strategy for constructing structural distortion to achieve significant enhancement on the activity and stability of OER catalysts.