Recycling Spent Ternary Cathodes to Oxygen Evolution Catalysts for Pure Water Anion-Exchange Membrane Electrolysis.
basic_science · Level V
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- Record sourced from PubMed, PMID 39129247.
- Also identified by DOI 10.1021/acsnano.4c07340.
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Abstract
Recycling spent lithium-ion batteries (LIBs) to efficient water-splitting electrocatalysts is a promising and sustainable technology route for green hydrogen production by renewables. In this work, a fluorinated ternary metal oxide (F-TMO) derived from spent LIBs was successfully converted to a robust water oxidation catalyst for pure water electrolysis by utilizing an anion-exchange membrane. The optimized catalyst delivered a high current density of 3.0 A cm<sup>-2</sup> at only 2.56 V and a durability of >300 h at 0.5 A cm<sup>-2</sup>, surpassing the noble-metal IrO<sub>2</sub> catalyst. Such excellent performance benefits from an artificially endowed interface layer on the F-TMO, which renders the exposure of active metal (oxy)hydroxide sites with a stabilized configuration during pure water operation. Compared to other metal oxides (i.e., NiO, Co<sub>3</sub>O<sub>4</sub>, MnO<sub>2</sub>), F-TMO possesses a higher stability number of 2.4 × 10<sup>6</sup>, indicating its strong potential for industrial applications. This work provides a feasible way of recycling waste LIBs to valuable electrocatalysts.