Heterodimensional hybrids assembled with multiple-dimensional copper selenide hollow microspheres and graphene oxide nanosheets for electromagnetic energy conversion and electrochemical energy storage

The highly advanced electronic information technology has brought many conveniences to the public, but the existence of electromagnetic (EM) pollution and energy scarcity are also becoming too difficult to ignore. The development of efficient and multifunctional EM materials is an inevitable demand. In this paper, hollow copper selenide microsphere-graphene oxide nanosheet (CG) composites are fabricated by using a simple template method. The heterodimensional structure constructed by three-dimensional microspheres and two-dimensional nanosheets endows the material with an integrated attenuation effect and abundant dielectric genes. By adjusting the content of GO, the microstructure of CG is precisely tailored, and its EM response is accurately regulated. The minimum reflection loss (RL) is up to − 61.77 dB (CG40), and the effective absorption bandwidth is 4.24 GHz (CG30). Meanwhile, effective electromagnetic interference (EMI) shielding performance is achieved (35.4 dB). In addition, excellent electrochemical performance is achieved. Based on the excellent EM property and electrochemical performance, a thermoelectric pile array is designed to convert and effectively store microwave energy. This work provides new inspiration for the design of EM functional materials and devices to solve EM pollution problems. Graphical Abstract