Facile and Controllable Synthesis of CuS@Ni-Co Layered Double Hydroxide Nanocages for Hybrid Supercapacitors

作者：Zhe Sheng, Xiongchao Lin, Yiting Zhao, Lei Huang, Hongfeng Gao, Hao Wei, Caihong Wang, Deping Xu, Yonggang Wang · 发表于：ACS Omega · 年份：2022 · DOI：10.1021/acsomega.2c03511 · 被引用次数：20 · 研究领域：Supercapacitor Materials and Fabrication、Advanced battery technologies research、Layered Double Hydroxides Synthesis and Applications

High Resolution Image Download MS PowerPoint Slide The synthesis of battery-type electrode materials with hollow nanostructures for high-performance hybrid supercapacitors (HSCs) remains challenging. In this study, hollow [email protected] layered double hydroxide (CuS-LDH) composites with distinguished compositions and structures are successfully synthesized by co-precipitation and the subsequent etching/ion-exchange reaction. CuS-LDH-10 with uniformly dispersed CuS prepared with the addition of 10 mg of CuS shows a unique hollow polyhedral structure constituted by loose nanosphere units, and these nanospheres are composed of interlaced fine nanosheets. The composite prepared with 30 mg of CuS addition (CuS-LDH-30) is composed of a hollow cubic morphology with vertically aligned nanosheets on the CuS shell. The CuS-LDH-10 and CuS-LDH-30 electrodes exhibit high specific capacity (765.1 and 659.6 C g –1 at 1 A g –1, respectively) and superior cycling performance. Additionally, the fabricated HSC delivers a prominent energy density of 52.7 Wh kg –1 at 804.5 W kg –1 and superior cycling performance of 87.9% capacity retention after 5000 cycles. Such work offers a practical and effortless route for synthesizing unique metal sulfide/hydroxide composite electrode materials with hollow structures for high-performance HSCs.