Electrochemical Restructuring Driven Catalytic Cycle of Bi-Based Heterojunctions for High-Performance Lithium-Sulfur Batteries.
basic_science · Level V
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- Record sourced from PubMed, PMID 38719733.
- Also identified by DOI 10.1021/acsnano.3c12279.
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Abstract
Restructuring is an important phenomenon in catalytic reactions. Conversion-type materials with suitable redox potential may undergo in situ electrochemically driven restructurings and induce highly active catalytic sites in a working lithium-sulfur battery. Herein, driven by the electrochemical conversion reaction of BiVO<sub>4</sub>, a reversible catalytic cycle of Bi/amorphous Li<sub>3</sub>VO<sub>4</sub> (a-Li<sub>3</sub>VO<sub>4</sub>) and Bi<sub>2</sub>S<sub>3</sub>/a-Li<sub>3</sub>VO<sub>4</sub> heterojunctions is constructed, which targets the oxidation of Li<sub>2</sub>S and the conversion of polysulfide, respectively. The heterostructures and electrochemically driven size confinement provide abundant sites for shuttle restraining and sulfur conversion. Especially, the p-block Bi and Bi<sub>2</sub>S<sub>3</sub> could dramatically reduce the conversion energy barriers of Li<sub>2</sub>S and polysulfide by virtue of the p-p orbital hybridization, promoting bidirectional reactions of the sulfur cathode. As a result, the corresponding sulfur cathode possesses a high reversible capacity of 7.5 mAh cm<sup>-2</sup> after 120 cycles under a high sulfur loading of 10.3 mg cm<sup>-2</sup> with a current density of 0.38 mA cm<sup>-2</sup>. This study furnishes a feasible scheme to obtain highly effective catalysts for bidirectional sulfur redox by utilizing the electrochemically induced restructuring.