Surface Tip Effects Enhanced Performance of Proton Exchange Membrane Water Electrolyzers.
basic_science · Level V
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- Record sourced from PubMed, PMID 40755435.
- Also identified by DOI 10.1021/acs.nanolett.5c02984.
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Abstract
IrO<sub>2</sub> is widely used as a benchmarking anode catalyst in a proton exchange membrane water electrolyzer (PEMWE) but suffers from insufficient activity. We report an urchin-like IrRuO<sub><i>x</i></sub> catalyst synthesized by a one-step hydrothermal method, which exhibits impressive oxygen evolution reaction activity and stability. In a PEMWE device, it achieves a current density of 6.4 A cm<sup>-2</sup> at 2 V with an Ir loading of only 0.2 mg cm<sup>-2</sup>. Notably, the catalyst also exhibits exceptional stability, operating over 1000 h at 1.0 A cm<sup>-2</sup>. Dynamic testing between 0.1 and 3.0 A cm<sup>-2</sup> further demonstrates its superior stability. This outstanding performance is primarily attributed to the unique tip effect of the urchin-like structure, enhancing areal current density and improving kinetics. This work advances the concept of catalyst surface morphology design and construction, demonstrating a practical advantage of morphology-driven enhancements, which is a feasible strategy for PEMWE to industrial applications.