Wet oxidative functionalization of carbon nanotube cloth to boost its performance as a flexible supercapacitor electrode

Structure‐guided Capacitance Relationships in Oxidized Graphene Porous Materials Based Supercapacitors

“…The specific surface area‐related capacitance yields a relationship of “Capacitance ≅ 0.12 × SSA”, suggesting a superior structure‐related capacitance in GEG samples compared to a slope of 0.10 or less in the typical NPCs with high porosity or oxidized carbon nanotube materials (Figure S1, Supporting Information). [ 21,27,28,51 ] Here, it is worth mentioning that all the GEG 1 –GEG 7 and GEG x@T series samples appear to show identical reduction degree (Figure S7; Tables S5 and S9, Supporting Information). Moreover, as shown in Figure S8, Supporting Information, the as‐produced EG 1 to EG 7 samples of near identical reduction degree show specific capacities between 120 and 250 F g −1 at 1.0 A g −1 , and vary monotonically with their SSA values, within the experimental error.…”

“…For example, the exfoliated graphene or RGO materials produced under plasma and laser/light irradiated conditions in literature show capacitance values between 30 to 300 F g À1 , and a significant drop in capacitance is often observed with further graphitization of the samples under high temperature, anything over 400 °C (Table S1, Supporting Information). [2,29,33,38,39,[45][46][47][48][49][51][52][53][54][55][56][57][58][59][60][61][62][63][64][65][66][67] To understand such a significant variation in capacitance between RGO materials of mildly reduced and highly graphitized nature, four sets of RGO samples are further produced with varied reduction/graphitization degrees. In this case, thermal annealing is performed on low, medium and high porosity representative samples of EG 1 , EG 3 , EG 4 and EG 6 at different temperatures of 400, 600, 800, 1000 and 1100 °C and resultant graphitized EG samples are named as GEG X-T (T is annealing temperature).…”

“…For example, the exfoliated graphene or RGO materials produced under plasma and laser/light irradiated conditions in literature show capacitance values between 30 to 300 F g −1 , and a significant drop in capacitance is often observed with further graphitization of the samples under high temperature, anything over 400 °C (Table S1, Supporting Information). [ 2,29,33,38,39,45–49,51–67 ]…”