Graphite Carbon Nitride(g-C3N4) segmentation by application delineates four primary demand drivers that collectively shape market size. Photocatalysis accounts for the largest share, driven by extensive research in water splitting, CO₂ reduction, and organic pollutant degradation, where g‑C₃N₄’s visible‑light activity and chemical stability create a competitive advantage. Energy storage—including lithium‑sulfur batteries and supercapacitors—leverages the material’s high surface area and tunable electronic structure, contributing roughly one‑third of total revenue. Sensors exploit the semiconductor’s band‑gap modulation for gas, biosensing, and humidity detection, a niche but rapidly expanding segment supported by low‑cost fabrication. Finally, environmental remediation encompasses adsorption‑based removal of heavy metals and dyes, where g‑C₃N₄’s porous morphology offers cost‑effective solutions for industrial effluents. These application categories not only define the market taxonomy but also dictate R&D allocation, supply‑chain configuration, and pricing dynamics across the Graphite Carbon Nitride(g-C3N4) market. Geographically, Asia‑Pacific leads adoption due to large‑scale solar‑fuel projects, while Europe emphasizes sensor integration in smart‑city initiatives.