Construct an in-situ heterostructure of TiO2/MoO3 to facilitate high-rate diffusion of Li+ and achieve high-energy density in asymmetric supercapacitors

Recently, constructing heterostructures at the working electrode has emerged as a promising technique in energy storage. This approach utilizes the interfacial energy level difference between two semiconductors to enhance charge transfer and improve Li + diffusion kinetics. In this work, we employed an in-situ hydrothermal method to successfully fabricate TiO 2 /MoO 3 heterostructured electrodes. The resulting interface driving force of approximately 0.54 V exhibited a significant enhancement in charge transfer and demonstrated superior Li + storage performance compared to individual MoO 3 electrodes. Additionally, the incorporation of TiO 2 effectively reduced volume expansion, enhancing the stability of the electrode material. As expected, the heterostructure electrode TiO 2 /MoO 3 (x = 10) exhibits the highest specific capacitance of 606.36 F·g −1 . Our further fabricated asymmetric supercapacitor TiO 2 /MoO 3 (x = 10)//PPy device presents an energy density of 42.28 Wh·kg −1 , which is 1.57-fold higher than that of the MoO 3 //PPy device. This study introduces a methodology that enhances the efficiency and accessibility in the process of creating electrode materials, thereby offering a more streamlined and user-friendly avenue for the advancement of supercapacitor.