A Mott-Schottky Heterojunction with Strong Chemisorption and Fast Conversion Effects for Room-Temperature Na-S Batteries.
A Mott-Schottky Heterojunction with Strong Chemisorption and Fast Conversion Effects for Room-Temperature Na-S Batteries.
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DOI：
10.1002/smll.202311180
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发表时间：
2024-01
期刊：
影响因子：
13.3
通讯作者：
Ting Wang;Wenqi Li;Yujun Fu;Dongjiao Wang;Liang Wu;Kai Sun;Dequan Liu;Runze Ma;Yujie Shi-Yuji
中科院分区：
文献类型：
--
作者：
Ting Wang;Wenqi Li;Yujun Fu;Dongjiao Wang;Liang Wu;Kai Sun;Dequan Liu;Runze Ma;Yujie Shi-Yuji
室温钠硫（RT Na-S）电池的可逆容量低，且由于反应动力学迟缓和穿梭效应导致的容量衰减严重，限制了其实际应用。为了实现多硫化钠（NaPSs）的有效化学吸附和催化，有必要设计合适的硫宿主与电催化剂相结合。本文在理论计算的指导下，设计并制备了由铁（Fe）和二硫化铁（FeS2）组分锚定在多孔碳基体（Fe/FeS2 -PC）上的内置电场的Mott-Schottky异质结。RT Na-S电池阴极Fe/FeS2异质结内内置电场的快速传递效应、Fe的化学吸附效应增强、FeS2的快速电催化效应以及Fe/FeS2异质结内内置电场的快速传递效应共同作用，有效提高了电化学性能。结果，Fe/FeS2 -PC@S阴极表现出高可逆容量（在0.2 a g-1下循环150次后达到815 mAh g-1）和优异的稳定性（在5 a g-1下循环600次后达到516 mAh g-1，每个循环只有0.07%的衰减）。Fe/FeS2异质结电催化剂的设计为高稳定性RT Na-S电池的开发提供了新的策略。
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.