Cationic Oxidative Leaching Engineering Modulated <i>In Situ</i> Self-Reconstruction of Nickel Sulfide for Superior Water Oxidation.
basic_science · Level V
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- Record sourced from PubMed, PMID 37249308.
- Also identified by DOI 10.1021/acs.nanolett.3c00885.
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Abstract
Tuning the electroactive surface species of electrocatalysts remains a significant challenge for achieving highly efficient oxygen evolution reactions. Herein, we propose an innovative <i>in situ</i> leaching strategy, modulated by cationic oxidation, to achieve active self-reconstruction of these catalysts. Vanadium is introduced as a cation into Ni<sub>3</sub>S<sub>2</sub> and oxidized under low oxidative potential, leading to subsequent leaching into the electrolyte and triggering self-reconstruction. The structural evolution from V-Ni<sub>3</sub>S<sub>2</sub> to Ni(OH)<sub>2</sub> and subsequently to NiOOH is identified by <i>operando</i> Raman as a three-step transition. In contrast, V-free Ni<sub>3</sub>S<sub>2</sub> is unable to bypass the thermodynamically predicted nickel oxysulfide products to transform into active NiOOH. As a result, the self-restructured V-Ni<sub>3</sub>S<sub>2</sub> only needs an ultralow overpotential of 155 mV at 10 mA cm<sup>-2</sup>, outperforming V-free Ni<sub>3</sub>S<sub>2</sub> and many other advanced catalysts. This work provides new guidelines for manipulating <i>in situ</i> leaching to modulate the self-reconstruction of catalysts.