As the demand for portable energy storage devices increases, the development of new materials with high power, long cycle life and safe operation are of utmost importance. Supercapacitors are a class of energy storage devices that exhibit high power and a greater cycle life than that to batteries. One disadvantage to commercial activated supercapacitors is their low energy density and slow frequency response. To solve these issues, new materials such as graphene and metal oxides have been introduced. In this thesis, additives such as carbon nanodots (CNDs) and ferrocene are introduced to laser reduced graphene supercapacitors to enhance their performance. Additionally, dodecaborate clusters are introduced as cross-linking agents to increase the stability of metal oxide supercapacitors. CNDs can act both as a spacer and can bond directly to laser reduced graphene oxide to both patch defects in the graphene sheets as well as connect the sheets together. The introduction of aromatic species such as ferrocene, can also increase the performance of graphene iii supercapacitors. Ferrocene can bind strongly to the graphene via pi-pi interactions and increase the capacitance through highly reversible redox reaction. Another method to increase the capacitance of supercapacitors is to employ the use of metal oxides. Metal oxides can often undergo multiple redox reactions which allows for supercapacitors with high energy density. However, most metal oxides do not offer high conductivity and the constant redox reactions can cause structural damage leading to poor cycling lifetimes. Here, we employ boron clusters and molecularly cross-link them to WO3 nanoparticles. The boron clusters can provide a conductive pathway for electrons while the WO3 can facilitate energy storage.