Figure 3

Raman spectra of electrode before and after cycling: (a) Raman spectra using 532 nm laser for pristine mSi@GNG film and cycled mSi and mSi@GNG samples. (b) UV resonant Raman spectra using ultraviolet laser (325 nm) for the pristine mSi@GNG film, cycled mSi and mSi@GNG samples. (c) Enlarged Raman spectra of Fig. 3b. (d) Raman mapping of mSi@GNG. (e) Raman mapping of cycled mSi@GNG, integrated from 450–550 cm⁻¹, showing as the yellow points. (f) Raman mapping of cycled mSi, integrated from 450–550 cm⁻¹.