School of Materials Science & Chemical Engineering, Ningbo University, Ningbo, Zhejiang, 315211, P. R. China.
State Key Laboratory of High-efficiency Coal Utilization, and Green Chemical Engineering, Ningxia University, Yinchuan, 750021, P. R. China.
Chemistry. 2018 Aug 27;24(48):12584-12591. doi: 10.1002/chem.201800960. Epub 2018 Jul 30.
Porous ternary metal sulfide integrated electrode materials with abundant electroactive sites and redox reactions are very promising for supercapacitors. Herein, a porous zinc cobalt sulfide nanosheet array on Ni foam (Zn-Co-S/NF) was constructed by facile growth of 2D bimetallic zinc/cobalt-based metal-organic framework (Zn/Co-MOF) nanosheets with leaf-like morphology on NF, followed by additional sulfurization. The Zn-Co-S/NF nanosheet array acted directly as a supercapacitor electrode showing much better electrochemical performance (2354.3 F g and 88.6 % retention over 1000 cycles) when compared with zinc cobalt sulfide powder (355.3 F g and 75.8 % retention over 1000 cycles), which originates from good electrical conductivity and mechanical stability, abundant electroactive sites, and facilitated transportation of electrons and electrolyte ions due to the unique nanosheet array structure. An asymmetric supercapacitor (ASC) device assembled from Zn-Co-S/NF and activated carbon electrodes can deliver a highest energy density of 31.9 Wh kg and a maximum power density of 8.5 kW kg . Most importantly, this ASC also shows good cycling stability (71.0 % retention over 10000 cycles). Furthermore, a red LED can be powered by two connected ASCs, and thus as-synthesized Zn-Co-S/NF has great potential for practical applications.
具有丰富电活性位点和氧化还原反应的多孔三元金属硫化物集成电极材料在超级电容器中极具应用前景。在此，通过在 NF 上简便生长具有类叶状形貌的二维双金属锌/钴基金属有机骨架（Zn/Co-MOF）纳米片，然后进行额外的硫化处理，构建了多孔的锌钴硫化物纳米片阵列（Zn-Co-S/NF）。与锌钴硫化物粉末（在 1000 次循环中保留 75.8%，为 355.3 F g）相比，Zn-Co-S/NF 纳米片阵列直接作为超级电容器电极表现出更好的电化学性能（在 1000 次循环中保留 88.6%，为 2354.3 F g），这源于良好的导电性和机械稳定性、丰富的电活性位点以及得益于独特的纳米片阵列结构，促进了电子和电解质离子的传输。由 Zn-Co-S/NF 和活性炭电极组装的非对称超级电容器（ASC）装置可提供 31.9 Wh kg 的最高能量密度和 8.5 kW kg 的最大功率密度。最重要的是，该 ASC 还表现出良好的循环稳定性（在 10000 次循环中保留 71.0%）。此外，两个连接的 ASC 可以为一个红色 LED 供电，因此，所合成的 Zn-Co-S/NF 在实际应用中具有很大的潜力。
