“…The dried samples were placed in a tube furnace and kept at 800 °C for 4 h in an Ar (5 °C min −1 ). 36 After the temperature dropped to room temperature, 1 mol L −1 HCl solution was added to the sample, stirred for 24 h to remove the template, then washed with deionized water and ethanol successively, and dried at 110 °C to obtain the template carbon (HTFBC) (Fig. 1).…”