MXene-mediated reconfiguration induces robust nickel-iron catalysts for industrial-grade water oxidation.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 38377200.
- Also identified by DOI 10.1073/pnas.2319894121 and PMC identifier 10907270.
- Licence recorded as CC BY-NC-ND.
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Abstract
Nickel-iron oxy/hydroxides (NiFeO<sub>x</sub>H<sub>y</sub>) emerge as an attractive type of electrocatalysts for alkaline water oxidation reaction (WOR), but which encounter a huge challenge in stability, especially at industrial-grade large current density due to uncontrollable Fe leakage. Here, we tailor the Fe coordination by a MXene-mediated reconfiguration strategy for the resultant NiFeO<sub>x</sub>H<sub>y</sub> catalyst to alleviate Fe leakage and thus reinforce the WOR stability. The introduction of ultrafine MXene with surface dangling bonds in the electrochemical reconfiguration over Ni-Fe Prussian blue analogue induces the covalent hybridization of NiFeO<sub>x</sub>H<sub>y</sub>/MXene, which not only accelerates WOR kinetics but also improves Fe oxidation resistance against segregation. As a result, the NiFeO<sub>x</sub>H<sub>y</sub> coupled with MXene exhibits an extraordinary durability at ampere-level current density over 1,000 h for alkaline WOR with an ultralow overpotential of only 307 mV. This work provides a broad avenue and mechanistic insights for the development of nickel-iron catalysts toward industrial applications.