Dong Xueying, Sun Jingjing, Mu Yang, Yu Yuting, Hu Tao, Miao Cui, Huang Chi, Meng Changgong, Zhang Yifu
State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, PR China.
Wuhan Institute of Biological Products, Co., LTD Wuhan 430070, PR China.
J Colloid Interface Sci. 2022 Mar 15;610:805-817. doi: 10.1016/j.jcis.2021.11.137. Epub 2021 Nov 25.
Aqueous rechargeable Zn-ion batteries (ARZIBs) have been attracting a great deal of attention due to their immense potential in large-scale power grid applications. It is of great significance to explore cathode material with novel designed structure and first-class performances for ARZIBs. Herein, we successfully construct a double-sandwich-like structure, MOF-derived carbon/manganese silicate/reduced graphene oxide/manganese silicate/MOF-derived carbon (denoted as rGO/MnSi/MOF-C), as the cathode material for ARZIBs. Among the double-sandwich-like structure, manganese silicate (MnSiO, denoted as MnSi) is in the middle of internal reduced graphene oxide (rGO) and external MOF-8 derived carbon (MOF-C). This integrated rGO/MnSi/MOF-C with double-sandwich-like structure can not only avert the sluggish electronic conduction progress caused by the conventional three-phase mixture system of rGO, MnSi and MOF-C, but also display promising Zn storing capability. As expected, in mild aqueous 2 M (mol L) ZnSO + 0.2 M MnSO electrolyte, the initial discharge capacity of rGO/MnSi/MOF-C cathode reaches to 246 mAh·g, and the peak discharge capacity reaches to 462 mAh·g at 0.1 A·g. This work not only involves the novel MnSi-based cathode for ARZIBs, but also first demonstrates our assumption of constructing the double-sandwich-like structure to improve Zn storage. Moreover, the concept "double-sandwich-like structure" provides an idea for synthesizing the integrated carbon/transition metal silicates (TMSs)/carbon structure to boost the electrochemical properties of TMSs for energy-storing devices.
水系可充电锌离子电池（ARZIBs）因其在大规模电网应用中的巨大潜力而备受关注。探索具有新颖设计结构和一流性能的ARZIBs阴极材料具有重要意义。在此，我们成功构建了一种双三明治状结构，即金属有机框架衍生碳/硅酸锰/还原氧化石墨烯/硅酸锰/金属有机框架衍生碳（表示为rGO/MnSi/MOF-C），作为ARZIBs的阴极材料。在双三明治状结构中，硅酸锰（MnSiO，记为MnSi）位于内部还原氧化石墨烯（rGO）和外部MOF-8衍生碳（MOF-C）之间。这种具有双三明治状结构的集成rGO/MnSi/MOF-C不仅可以避免由rGO、MnSi和MOF-C的传统三相混合体系引起的缓慢电子传导过程，而且还表现出有前景的锌存储能力。正如预期的那样，在温和的2 M（mol/L）ZnSO₄ + 0.2 M MnSO₄水系电解液中，rGO/MnSi/MOF-C阴极的初始放电容量达到246 mAh·g，在0.1 A·g时峰值放电容量达到462 mAh·g。这项工作不仅涉及用于ARZIBs的新型MnSi基阴极，而且首次证明了我们构建双三明治状结构以改善锌存储的假设。此外，“双三明治状结构”的概念为合成集成碳/过渡金属硅酸盐（TMSs）/碳结构以提高TMSs在储能装置中的电化学性能提供了思路。
