fig9

Figure 9. (A) The effect of delignification treatment on precursors. Scheme of delignification^[87] (Copyright 2024, Wiley-VCH). (B) Electrochemical properties of HC materials. (i) GCD curves at 20 mA g^-1. (ii) Capacity ratios of the slope region and plateau region in the second cycle discharge curve. (iii) Rate performance. (iv) The linear relationship between log i and log v of cathodic peaks at 0.01 V. (v) GITT curves^[87] (Copyright 2024, Wiley-VCH). (C)Schematic preparation process of phytic acid activating lignin-derived HC material^[152] (Copyright 2023, Wiley Periodicals LLC). (D) Galvanostatic discharge/charge curves of (i) LHC 800, (ii) PLHC 800, and (iii) PLHC 1300 at 30 mA g^-1. (iv) Specific capacities at plateau region^[152] (Copyright 2023, Wiley Periodicals LLC).