Two dimensional MoS₂/CNT hybrid ink for paper-based capacitive energy storage

Developing two dimensional (2D) materials based ink is an advanced method for fabricating printable and flexible electronic devices. 2D few-layered molybdenum disulfide (MoS₂) reveals a great potential for capacitive energy storage because of its layered structure (for ion intercalation), high surface area (provide active sites) and multi-valence state of Mo (introduce pseudocapacitive reactions). These unique properties could intensively improve the potential of MoS₂ for supercapacitors. However, MoS₂ is a semiconductor with low conductivity, which limits its performance in electrochemistry. In the meantime, MoS₂ based ink for flexible energy storage application has been barely investigated. In this work, we design a MoS₂ and carbon nanotube (MoS₂/CNT) hybrid ink that uses exfoliated MoS₂ nanosheet and CNT to fabricate a paper-based supercapacitor. A strong synergistic effect between MoS₂ and CNT in capacitive performance was observed due to the good conductivity of CNT and high capacitance of MoS₂. Paper-based solid-state device is also fabricated which reveals good flexibility and high capacitive performance. This hybrid ink represents a new road for flexible paper-based devices.