This work employ two morphological BDD films, namely, boron-doped microcrystalline diamond (BMCD) and boron-doped ultra-nanocrystalline diamond (BUNCD), for nanostructuring via reactive ion etching. These nanostructured diamonds with enhanced surface area were then employed to fabricate electrochemical supercapacitors, which displayed high specific capacitance and better current response. Raman spectroscopy measurements confirmed the presence of sp2-hybridized carbon, which was again observed in X-ray photoelectron spectroscopy studies and the presence of oxygen functional group explained the better electric double-layer capacitor behavior. The electrochemical analysis of these samples shows they exhibit superior electron transfer kinetics with 80% capacitance retention after 2000 cycles, which indicates the suitable utilization of these nanostructured samples as electrodes in electrochemical supercapacitors. Furthermore, 75% capacity retention for the nanostructured BMCD was observed at 5000 cycles, which is approximately 10% superior to BUNCDN. These results will aid in selecting the optimal electrode material for carbon-based electrochemical supercapacitor applications.
