Ultrathin 2D Graphitic Carbon Nitride on Metal Films: Underpotential Sodium Deposition in Adlayers for Sodium-Ion Batteries
Ultrathin 2D Graphitic Carbon Nitride on Metal Films: Underpotential Sodium Deposition in Adlayers for Sodium-Ion Batteries
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DOI：
10.1002/anie.202000314
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发表时间：
2020-04-06
影响因子：
16.6
通讯作者：
Xiao, Kai
中科院分区：
文献类型：
--
作者：
Chen, Lu;Yan, Runyu;Xiao, Kai
高效、低成本的钠离子电池负极材料是实现更经济的能量存储的迫切需要。研究了在铜电极上沉积超薄氮化碳膜的影响因素。综合这些效应显示出异常高的金属钠储存能力。g-C3N4薄膜薄至10nm，可通过高效、简便、通用的化学气相沉积方法制备。高达51 Ah g（-1）的高可逆容量表明，Na不仅被储存在氮化碳中，而且氮化碳也激活了金属进行可逆的Na沉积，同时形成固体电解质界面层，避免了金属相与液体电解质的直接接触。
Efficient and low-cost anode materials for the sodium-ion battery are highly desired to enable more economic energy storage. Effects on an ultrathin carbon nitride film deposited on a copper metal electrode are presented. The combination of effects show an unusually high capacity to store sodium metal. The g-C3N4 film is as thin as 10 nm and can be fabricated by an efficient, facile, and general chemical-vapor deposition method. A high reversible capacity of formally up to 51 Ah g(-1) indicates that the Na is not only stored in the carbon nitride as such, but that carbon nitride activates also the metal for reversible Na-deposition, while forming at the same time an solid electrolyte interface layer avoiding direct contact of the metallic phase with the liquid electrolyte.