The preparation of synthetic graphite materials with ...
· Herein, synthetic graphite materials with hierarchical pores and large specific surface area were successfully prepared by onestep impregnation with lignite as the carbon source, sulfuric acid (H 2 SO 4) as the oxidant, and phosphoric acid (H 3 PO 4) as the microstructural characteristics of synthetic graphite were investigated via Xray diffraction (XRD), Raman .