No More HF: Teflon‐Assisted Ultrafast Removal of Silica to Generate High‐Surface‐Area Mesostructured Carbon for Enhanced CO 2 Capture and Supercapacitor Performance

An innovative technique to obtain high‐surface‐area mesostructured carbon (2545 m 2  g −1 ) with significant microporosity uses Teflon as the silica template removal agent. This method not only shortens synthesis time by combining silica removal and carbonization in a single step, but also assists in ultrafast removal of the template (in 10 min) with complete elimination of toxic HF usage. The obtained carbon material (JNC‐1) displays excellent CO 2 capture ability (ca. 26.2 wt % at 0 °C under 0.88 bar CO 2 pressure), which is twice that of CMK‐3 obtained by the HF etching method (13.0 wt %). JNC‐1 demonstrated higher H 2 adsorption capacity (2.8 wt %) compared to CMK‐3 (1.2 wt %) at −196 °C under 1.0 bar H 2 pressure. The bimodal pore architecture of JNC‐1 led to superior supercapacitor performance, with a specific capacitance of 292 F g −1 and 182 F g −1 at a drain rate of 1 A g −1 and 50 A g −1 , respectively, in 1  m H 2 SO 4 compared to CMK‐3 and activated carbon.