@article{Ran2026, 
author = {Lin Ran and Zhen Qin and Jianni Li and Fei Xu and Daohong Zhang and Ting Li},
title = {Anion-activated dual redox in amorphous CoS2 hollow nanoleaves for advanced magnesium storage cathodes},
year = {2026},
journal = {Nano Research},
keywords = {rechargeable magnesium batteries, cathode materials, anion-activated, amorphous cobalt sulfide, dual redox chemistry},
url = {https://www.sciopen.com/article/10.26599/NR.2026.94909136},
doi = {10.26599/NR.2026.94909136},
abstract = {Rechargeable magnesium batteries (RMBs) are promising candidates for sustainable energy-storage technologies, yet their advancement has been constrained by the scarcity of high-performance cathode materials. While conversion-type cathodes circumvent the structural limitations of Mg-intercalation mechanisms, most existing conversion cathodes depend exclusively on the redox activity of transition metal cations, whose capacity is inherently restricted by the reversibility of metal-ion oxidation states. Herein, we report amorphous CoS2 hollow nanoleaves (a-CoS2) derived from cobalt-based metal-organic frameworks, which host a dual redox Mg-storage mechanism wherein sulfur anions and cobalt cations undergo simultaneous and reversible redox reactions. Coupled with the abundant anionic sites, hollow architecture and amorphous structure, the a-CoS2 cathode delivers a high reversible capacity of 195 mAh g-1 at 50 mA g-1, remarkable rate capability of 76.1 mAh g-1 at 1.0 A g-1, and outstanding long-term cyclability (74.6% capacity retention after 300 cycles at 200 mA g-1), which are significantly outperforming amorphous CoS (a-CoS) and crystalline CoS2 (c-CoS2). Mechanistic studies confirm the reversible reconstruction of S–S bonds during magnesiation/demagnesiation, along with valence evolution of cobalt ions. This work establishes an anion-activated dual redox chemistry that transcends the limitations of conventional cation-only redox paradigm, providing new design principle for high-capacity cathode materials in multivalent-ion batteries.}
}