Fermentation assisted preparation of O and N riched porous carbon for high performance flexible supercapacitors

Pre‐Oxidating and Pre‐Carbonizing to Regulate the Composition and Structure of Coal Tar Pitch: The Fabrication of Porous Carbon for Supercapacitor Applications

“…And there is no obvious deformation even at a high scan rate of 100 mV s −1 (Figure S16b, Supporting Information) and a low current density of 0.5 A g −1 (Figure 4b), suggesting OCZ‐3‐700 has good electrical conductivity and fast ion transfer capability. [ 26 ] The contributions of SC (surface capacity) and IC (insertion capacity) of OCZ‐3‐700 were tested at 5 mV s −1 (Figure 4c). The contribution of SC is 89% in total capacitance, suggesting that the EDLC is dominant.…”

“…As shown in Figure S26 (Supporting Information), the open circuit voltage of OCZ‐3‐700 can still be maintained at 0.4987 V after self‐discharge of 10 000 s. While the open circuit voltage of AC is significantly reduced to 0.1247 V. It may be due to the abundant microporous in OCZ‐3‐700, where the resistance to carrier movement in micropores is relatively stronger than in macropores/mesopores so that inhibits the charge redistribution process. [ 26 ]…”

“…As shown in Figure S26 (Supporting Information), the open circuit voltage of OCZ-3-700 can still be maintained at 0.4987 V after self-discharge of 10 000 s. While the open circuit voltage of AC is significantly reduced to 0.1247 V. It may be due to the abundant microporous in OCZ-3-700, where the resistance to carrier movement in micropores is relatively stronger than in macropores/mesopores so that inhibits the charge redistribution process. [26] The ZnCl 2 -EG/PVA DES gel was prepared for a wide range of pH (acidic, neutral and alkaline) electrolytes, and the electrochemical performances of symmetric capacitors assembled with different acidity of DES gel electrolytes were studied. The maximum strain of DES gel at maximum stress (0.84 Mpa) can reach up to 352%, which is better than the aqueous PVA gel in our recently research work, [28] and it can bear the weight of 100 g, and DES gel with different shapes can be easily prepared (Figure 5a), suggesting excellent plasticity and mechanical perfor-mance.…”

Gas Phase‐Heat Absorption‐Condensate Phase Stepwise Flame Retardant Strategy to Prepare Coal Tar Pitch‐Based Porous Carbon for Supercapacitor

“…[36] The high-resolution N 1s spectrum could be divided into three peaks located at 398.8, 399.8, and 401.1 eV (Figure 5b), which were distributed to pyridinic-N, pyrrolic-N, and graphitic-N, respectively. [37] The pyridinic-N or pyrrolic-N group could increase the ion diffusion rate by introducing a large number of contactable defects and providing additional pseudo-capacitance. [38] The graphitic-N could enhance the conductivity of carbon and thus increase the electron transfer rate.…”