fig8

Figure 8. (A) In-situ XRD and in-situ Raman tests of the CMGL electrode during discharging^[87]. Copyright 2021, Wiley; (B) cyclic voltammetry curves of CBC at scanned rate of 0.1 mV s^-1 between 0.005 V and 3.0 V^[65]. Copyright 2019, Elsevier; (C) rate performance evaluation of pristine GCNT, 200-PGCNT and 300-PGCNT^[88]. Copyright 2022, Wiley; (D) representative nitrogen adsorption-desorption isotherm curve of CNFF and pore size distribution of the CNFF electrode^[89]. Copyright 2018, American Chemical Society. XRD: X-ray diffraction; CMGL: carbonized Magnolia grandiflora Lima; GCNT: glucose combined with multi-walled carbon nanotubes; CNFF: carbon nanofiber foam; CBC: bio-hard carbon.