Ramsdellite-MnO2 Regeneration via Acid-Mediated Redox Tuning toward Rechargeable Aqueous Zinc-Ion Batteries DOI
Hang Xiao, Da Xiong, Bing Lü

et al.

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

The mounting accumulation of spent alkaline batteries (SABs) elicits concerns over both environmental threats and the recycling industry's profitability, closely tied to chemical reactions in manganese-based waste treatment. Herein, we design an acid-modulated phase-reconstruction strategy for sustainable recovery manganese oxides from SABs, where moderate proton participation facilitates preformation MnOOH intermediates before initial transformation ramsdellite-MnO2 (RM-R, orthorhombic) final conversion pyrolusite-MnO2 (RM-β, tetragonal) nanomaterials. This rarely reported metastable RM-R phase features a unique tunneled framework (1 × 2 edge-shared MnO6 octahedra) enabling reversible H+/Zn2+ (de)intercalation, though its traditional synthesis remains challenging due thermodynamic instability. First-principles calculations reveal that possesses lower Zn2+ diffusion barriers (0.44 eV) than RM-β (0.99 eV), consistent with superior storage performance. Moreover, higher specific surface area enables cathode battery-supercapacitor hybrid behavior, which delivers remarkable capacity (214.9 mA h g-1 at 0.1 A g-1) long cycling stability (98% retention after 1000 cycles), outperforming most MnO2-based cathodes. low-acid regeneration protocol (4 mL HCl/1.85 g waste) paves way closed-loop battery clarifies structure-property relationships oxides.

Language: Английский

Ramsdellite-MnO2 Regeneration via Acid-Mediated Redox Tuning toward Rechargeable Aqueous Zinc-Ion Batteries DOI
Hang Xiao, Da Xiong, Bing Lü

et al.

Inorganic Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: April 14, 2025

The mounting accumulation of spent alkaline batteries (SABs) elicits concerns over both environmental threats and the recycling industry's profitability, closely tied to chemical reactions in manganese-based waste treatment. Herein, we design an acid-modulated phase-reconstruction strategy for sustainable recovery manganese oxides from SABs, where moderate proton participation facilitates preformation MnOOH intermediates before initial transformation ramsdellite-MnO2 (RM-R, orthorhombic) final conversion pyrolusite-MnO2 (RM-β, tetragonal) nanomaterials. This rarely reported metastable RM-R phase features a unique tunneled framework (1 × 2 edge-shared MnO6 octahedra) enabling reversible H+/Zn2+ (de)intercalation, though its traditional synthesis remains challenging due thermodynamic instability. First-principles calculations reveal that possesses lower Zn2+ diffusion barriers (0.44 eV) than RM-β (0.99 eV), consistent with superior storage performance. Moreover, higher specific surface area enables cathode battery-supercapacitor hybrid behavior, which delivers remarkable capacity (214.9 mA h g-1 at 0.1 A g-1) long cycling stability (98% retention after 1000 cycles), outperforming most MnO2-based cathodes. low-acid regeneration protocol (4 mL HCl/1.85 g waste) paves way closed-loop battery clarifies structure-property relationships oxides.

Language: Английский

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