College of Materials Science and Engineering, Zhengzhou University, Zhengzhou, 450001, P. R. China.
State Key Laboratory of Catalysis, iChEM, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, P. R. China.
Angew Chem Int Ed Engl. 2023 Mar 27;62(14):e202218282. doi: 10.1002/anie.202218282. Epub 2023 Feb 20.
Metallic conductive 1T phase molybdenum sulfide (MoS ) has been identified as promising anode for sodium ion (Na ) batteries, but its metastable feature makes it difficult to obtain and its restacking during the charge/discharge processing result in part capacity reversibility. Herein, a synergetic effect of atomic-interface engineering is employed for constructing 2H-MoS layers assembled on single atomically dispersed Fe-N-C (SA Fe-N-C) anode material that boosts its reversible capacity. The work-function-driven-electron transfer occurs from SA Fe-N-C to 2H-MoS via the Fe-S bonds, which enhances the adsorption of Na by 2H-MoS , and lays the foundation for the sodiation process. A phase transfer from 2H to 1T/2H MoS with the ferromagnetic spin-polarization of SA Fe-N-C occurs during the sodiation/desodiation process, which significantly enhances the Na storage kinetics, and thus the 1T/2H MoS /SA Fe-N-C display a high electronic conductivity and a fast Na diffusion rate.
金属导电 1T 相二硫化钼 (MoS ) 已被确定为钠离子 (Na ) 电池有前途的阳极，但它的亚稳特征使其难以获得，并且在充放电过程中的堆积导致部分容量可逆性降低。在此，采用原子界面工程的协同效应构建了组装在单原子分散的 Fe-N-C（SA Fe-N-C）阳极材料上的 2H-MoS 层，从而提高了其可逆容量。工作函数驱动的电子从 SA Fe-N-C 通过 Fe-S 键转移到 2H-MoS ，从而增强了 2H-MoS 对 Na 的吸附，为钠化过程奠定了基础。在钠化/脱钠过程中，2H 相到 1T/2H MoS 的相转移以及 SA Fe-N-C 的铁磁自旋极化，显著提高了 Na 存储动力学，因此 1T/2H MoS /SA Fe-N-C 具有高电子导电性和快速 Na 扩散率。
