fig17

From: A review of the preparation and characterization techniques for closed pores in hard carbon and their functions in sodium-ion batteries

Figure 17. (A) The typical charge/discharge profile of HC electrode and the color changes of ethanol containing 1% phenolphthalein after reaction with HC at different potentials^[32] (Copyright 2023, American Chemical Society). (B) Galvanostatic discharge curves of BHCs at 50 mA/g (inset: optical photographs of electrodes at different discharge stages soaked in an ethanol solution containing phenolphthalein, numbered with Roman numerals corresponding to the discharge stage^[169]) (Copyright 2022, Sichuan University and John Wiley & Sons Australia, Ltd). (C) Typical charge/discharge curves of HCMP-CO₂ and the corresponding color change of ethanol containing 1% phenolphthalein after reaction with the HCMP-CO₂ electrode at different potentials^[138] (Copyright 2023, Wiley-VCH).