Designing advanced energy materials based on carbon nanostructures that could meet consumer requirements with high performance at low cost and not requiring expensive or precious materials is a green step towards new-gen energy systems. Such systems would be lightweight and could replace rapidly exhausting Li-based batteries. Although several carbon nanomaterials were reported for high performance, the problems with capacity, rate capability, or electrochemical stability still have to be improved for the high performance of these materials. The most promising and widely accepted way to improve the electrochemical properties of electrode materials is their tailoring at the nanoscale. Therefore, in our research, we developed one of the most promising ways to achieve these properties with the plasma-assisted synthesis of various advanced carbon nanostructures. Plasma is also a clean, ecologically benign and safe processing tool to tailor electrode materials at the nanoscale, without any waste residuals. The plasma-assisted processing was aimed at all-in-one packaged electrodes at a low cost for industry requirements. Using different carbon-containing gases, we produced different graphene-like 1D or 2D materials or their hybrids in low-temperature plasmas as a base or in single-step. The hybrid carbon nanostructures doped or with nanoparticles were used directly as electrode materials. However, in some cases, the sequent conversion or modification secondary step was applied to modify electrode materials for high performance. This was done either with doping with N atoms or conversions with sulphur. These electrode materials were then tested for batteries improving Li-storage or designing new multivalent metal-ion batteries and electrochemical supercapacitors. The obtained results were compared to the existing state of the art, and significant improvements in electrochemical performance were achieved. The talk will highlight these achievements with different synthesis processes for various carbon nanostructures and their hybrids and compare their performance as electrodes for improving batteries and supercapacitors.