Hao Guo,Hao Zhang,Ning Wu,Zhilan Pan,Cuiliu Li,Yuan Chen,Yujuan Cao,Wu Yang
In this article, a trimesic acid-mediating control synthesis strategy was proposed for preparing the NiCo-MOF composition structure of microsphere and nanosheet by substituting 1,4-dicarboxybenzene with trimesic acid. Then the pre-synthesized MOF , as a precursor and template, was further vulcanized by a facile hydrothermal method to obtain hollow microsphere and nanosheet interleaved nickel and cobalt bimetallic sulfide materials (NiCo-S) while these microspheres and nanosheets were composed of smaller nanoparticles . This unique structure endowed quick electron/ion transport and electrolyte penetration as well as abundant redox active sites, significantly facilitating electrochemical performance. The obtained NiCo-S-2 showed higher specific capacitance (1790.4 F g −1 ) than its precursor NiCo-MOF-2 and other molar ratios of counterparts. Using it as an positive electrode and activated carbon (AC) as negative electrode, the assembled asymmetric supercapacitor NiCo-S-2//AC also delivered a high specific capacitance of 114.4 F g −1 and big specific energy of 35.5 Wh kg −1 at 799.99 W kg −1 .
Graphene or graphene-like carbon nanosheet (GNS) with excellent properties presents great potential to improve substantially the combined properties of copper matrix composites. However, it is still a great challenge to develop new methods for the preparation of GNS-reinforced copper composites. In this work, high-strength, high-conductivity and low-thermal expansion GNS/Cu composites were prepared by pyrolyzing trimesic acid@copper formate and spark plasma sintering. Both the volume fraction and the order degree of carbon in GNS/Cu composites were improved by the introduction of trimesic acid. The highest tensile and compressive yield strength of GNS/Cu composites are 542 MPa and 637 MPa, respectively. After hot-rolling process, the plastic deformation and the electrical conductivity of the composites are improved effectively and reach 9% and 86.2% IACS, respectively; the average coefficient of thermal expansion (CTE) of the composite is as low as 12.4 × 10 −6 °C −1 , which is only 72.9% of pure Cu material. This work provides an effective solution for the design of the GNS/Cu composites with excellent combined performance.
危险品化学品经营许可证（带存储）