Routine or incremental work, however competently researched and reported, should not be recommended for publication if it does not meet our expectations with regard to novelty and impact.It is the responsibility of authors to provide fully convincing evidence for the homogeneity and identity of all compounds they claim as new. Evidence of both purity and identity is required to establish that the properties and constants reported are those of the compound with the new structure claimed.Thank you for your effort in reviewing this submission. It is only through the continued service of referees that we can maintain both the high quality of the publication and the rapid response times to authors.Corn husk, a renewable biomass, has been successfully explored as low-cost crude carbon source to prepare advanced higher-value 3D HPCs by means of KOH pre-treatment and direct pyrolysis, and the route is simple, self-template and easy to implement scale-up for industrialization. The CHHPCs present many advantages for supercapacior application, including higher surface area (928 m 2 g -1 ), hierarchical porosity consisting of macro, meso, and micropores, turbostratic carbon structure, uniform pore size, 3D architecture and rich O-doping (17.1 wt%). The supercapacitor performance of CHHPCs was evaluated in 6 M KOH electrolyte and 1 M Na 2 SO 4 electrolyte. The CHHPCs exhibits a high specific capacitance of 356 F g -1 and 300 F g -1 at 1 A g -1 , 20 A g -1 , respectively, ultra-high rate capability with 88% retention rate from 1 to 10 A g -1 and outstanding cycling stability with 95% capacitance retention after 2500 cycles. The CHHPCs symmetric supercapacitor displays a high energy density of 21 Wh kg -1 at a power density of 875 W kg -1 and retains as high as 11 Wh kg -1 at 5600 W kg -1 in 1M Na 2 SO 4 electrolyte. The facile, efficient and template-free synthesis strategy for novel 3D-HPCs from biomass sources may promote commercial application of 3D-HPCs in the fields of supercapacitors, lithium ion batteries, fuel cells and sorbents.