The B/C/N composites were synthesized by a very simple method, that is, carbonization at HTT = 800-1200˚C of the precursor prepared by drying a solution mixture of polyacrylamide and boric acid, followed by boiling in water to remove borate by-products. The amount of insoluble B species in the composite increased linearly from 4.8 to 18.6 mass% with raising HTT. The XRD and FT-IR , larger for lower HTT, in the acid and neutral electrolytes, respectively.
KAPTON films with and without adding small amounts of metallic compounds 0.1 2 at as metal were carbonized at 800 1200 for 1 h in nitrogen and capacitance was measured in sulfate solutions by cyclic voltammetry. Nitrogen containing carbons derived from the film without additives had low specific surface area SBET 90 m 2 g-1 and the capacitance CT was lower than 35 F g-1. The capacitance normalized by SBET CSP , however, reached as high as 0.77 F m-2 , and decreased with decreasing nitrogen content WN , indicating pseudocapacitance due to nitrogen. The correlation between CSP and a proportion of particular nitrogen species on the surface was not observed. Except for silicone, the addition of compounds of Fe II , Co II , Ni II and Ti IV increased SBET SBET increased with increasing amount of additives. The CSP value for the products at 850 varied depending on the additives, and the products were grouped under a nitrogen containing carbons mainly showing pseudocapacitance due to nitrogen, b iron containing carbons showing redox peaks, and c carbons having relatively high SBET around 400 m 2 g-1 and mainly showing the electric double layer capacitance.
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