4a , as the amount of K 2 CO 3 was gradually decreased, the characteristic (002) peak at approximately 26° showed a decreasing trend; 37 this peak nearly disappeared when KOH alone was used as the activator, indicating that the graphite microcrystalline structure of carbon had been completely corroded and destroyed by KOH, which led to poor electrical conductivity. 38 The Raman spectra are shown in Fig. 4b ; the G band peak intensity gradually decreased, and the defects increased with decreasing K 2 CO 3 .
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