Embedded Ir─Ru Single-Atom Alloy with Self-Limiting Motifs for Sustainable Proton Exchange Membrane Water Electrolysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 41045107.
- Also identified by DOI 10.1002/adma.202507340.
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Abstract
Designing acid-stable anodic electrocatalysts with low noble-metal loading is essential for the industrial-scale application of proton exchange membrane water electrolysis (PEMWE). However, existing catalyst systems struggle to fully utilize the intrinsic properties of active sites. Here, a precisely engineered nanocatalyst is unveiled through a hierarchical atomic assembly strategy for synthesis, featuring an ultralow-content Ir─Ru single-atom alloy integrated into robust titanium dioxide nanowires (Ir<sub>1</sub>Ru/TiO<sub>2</sub>). This lattice-embedded structure induces the support to reduce the dissolution and excessive oxidation of Ru/Ir sites through strong interfacial coupling, significantly enhancing the corrosion resistance of catalysts. Moreover, atomically dispersed Ir induces the formation of uniquely shortened Ru─O ligand bonds, serving as stable self-limiting motifs, in contrast to the conventional formation of amorphous oxide layers. The Ir<sub>1</sub>Ru/TiO<sub>2</sub> catalyst showcases an initial mass activity of 1971.5 A <math xmlns="http://www.w3.org/1998/Math/MathML"> <semantics><msubsup><mi>g</mi> <mrow><mi>Ir</mi> <mo>+</mo> <mi>Ru</mi></mrow> <mrow><mo>-</mo> <mn>1</mn></mrow> </msubsup> <annotation>${\mathrm{g}}_{{\mathrm{Ir + Ru}}}^{ - {\mathrm{1}}}$</annotation></semantics> </math> , enabling stable operation at 10 mA cm<sup>-2</sup> for over 3200 h and at the rated current density of 2 A cm<sup>-2</sup> for 2000 h in PEMWE.