A Simple KOH Activation Method to Prepare Highly Conductive Porous Carbon From Sodium Humate for Supercapacitor Electrode

Achieving simultaneous enhancement of high specific surface area (SSA) and high electrical conductivity remains a critical challenge in the development of high‐performance supercapacitors. In this study, sodium humate derived from biomass was employed as a carbon precursor, leveraging the structural directing effect of surfactant F127 in combination with KOH activation. By precisely controlling the pyrolysis temperature, a hierarchical porous carbon material was successfully synthesized. It was observed that increasing the activation temperature not only enhanced the structural ordering of carbon microcrystals, but also significantly reduced surface oxygen‐containing functional groups. The optimized sample exhibited a SSA of up to 2025 m 2 g −1 and an electrical conductivity of 128 S m −1 , eliminating the need for conductive additives during electrode fabrication. Owing to the synergistic contribution of the hierarchical pore architecture and highly conductive carbon network, the material delivered a high energy density of 48.1 Wh kg −1 in a 3.2 V organic electrolyte and retained 98% of its initial capacitance after 10,000 cycles at a current density of 2.5 A g −1 , demonstrating outstanding cycling stability.