Biomass-based functional materials are known as versatile and cost-effective sources for the formation of different advanced nanocarbon materials. Sorghum stalks biomass is a main residual lignocellulosic agricultural material that produces in huge amounts after harvesting of sorghum grains. However, Sorghum stalks biomass material has low density, large specific volume, and no nutritional value, therefore actions are required for its valorization. This work investigates conversion of sorghum stalks into nanostructured carbon materials via thermochemical activation by phosphoric, which acts as activating and doping reagent at the same time. The formed carbon materials were characterized by ATR-FTIR, Raman spectroscopy, XRD, XPS, N