A Mott–Schottky Heterojunction with Strong Chemisorption and Fast Conversion Effects for Room‐Temperature Na–S Batteries

Abstract

The practical application of the room‐temperature sodium–sulfur (RT Na–S) batteries is currently limited by low reversible capacity and serious capacity decay due to the sluggish reaction kinetics and shuttle effect. It is necessary to design a suitable sulfur host integrated with electrocatalysts to realize effective chemisorption and catalysis of sodium polysulfides (NaPSs). Herein, under the guidance of theoretical calculation, the Mott–Schottky heterojunction with a built‐in electric field composed of iron (Fe) and iron disulfide (FeS2) components anchored on a porous carbon matrix (Fe/FeS2‐PC) is designed and prepared. The enhanced chemisorption effect of Fe, the fast electrocatalytic effect of FeS2, and the fast transfer effect of the built‐in electric field within the Fe/FeS2 heterojunction in the cathode of RT Na–S batteries work together to effectively improve the electrochemical performance. As a result, the Fe/FeS2‐PC@S cathode exhibits high reversible capacity (815 mAh g−1 after 150 cycles at 0.2 A g−1) and excellent stability (516 mAh g−1 after 600 cycles at 5 A g−1, with only 0.07% decay per cycle). The design of the Fe/FeS2 heterojunction electrocatalyst provides a new strategy for the development of highly stable RT Na‐S batteries.

The Compatibility of COFs Cathode and Optimized Electrolyte for Ultra‐Long Lifetime Rechargeable Aqueous Zinc‐Ion Battery

“…[1] A diverse array of potential technologies suitable for EESs is under intensive investigation. [2][3][4] Among them, rechargeable aqueous zinc-ion batteries (RAZIBs) present themselves as promising energy storage solutions, particularly for large-scale implementations, this is primarily attributed to their distinct advantages over monovalent (Li + , Na + ) [5][6][7] and multivalent metal-ion (Mg 2 + , Ca 2 + ) batteries, [8,9] such as their superior safety profile, non-toxic nature, and relatively economical cost. [10] Despite the progress, a key challenge in enhancing RAZIBs is the identification of suitable cathode materials.…”