High capacitance B/C/N composites for capacitor electrodes synthesized by a simple method

Abstract

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.

Carbon materials for electrochemical capacitors

“…Recently, boron and nitrogen co-doped carbon materials were reported for electrochemical capacitors [145,146]. The co-doped porous carbons were derived from gels which were prepared from citric acid, H 3 BO 3 and NH 4 OH using NiCl 2 as an activating agent [145].…”

“…Any correlation between capacitance and composition was absent, and the effect of boron and nitrogen was not discussed in detail. More simple method to form the co-doped carbons was reported, that is, carbonization of the precursor prepared by drying a solution mixture of polyacrylamide (PAA) and H 3 BO 3 , followed by boiling in water to remove borate by-products [146]. The boron content increased linearly from 4.8 to 18.6 mass% in a range of carbonization temperature of 800-1200 • C, in parallel with the change in the relative intensity of B 1 s peak to C 1 s peak by XPS.…”

Sustainable synthesis of phosphorus- and nitrogen-co-doped porous carbons with tunable surface properties for supercapacitors

“…Despite specific capacitances are lower than that of conducting polymers or metal oxides, porous carbons triumph over their competitors in commercial devices because of their greater cycle stability and higher electrical conductivity [3e6]. Substitution of carbon atoms with heteroatoms (such as nitrogen [8], boron [9], phosphorus [10], and oxygen [11]) in the basal planes and/or at the edges endows them with exciting properties due to the tailored electronic structure and surface properties. Therefore, heteroatomdoped carbons have recently drawn much attention because of their potential applications in metal free heterogeneous catalysis, solar energy conversion, lithium ion batteries, and fuel cells [12,13].…”

On the (Pseudo) Capacitive Performance of Jack Fruit Seed Carbon

“…Though these reactions are not visible in our studies with JFSC at the scan rate investigated the above reasons may still be valid to explain the capacitance obtained. Few studies on the electrode cell performance of activated carbons in Na 2 SO 4 show that the pseudo-Faradaic redox transitions of O and N-containing electroactive surface groups are depressed in this electrolyte in comparison with H 2 SO 4 [36,70,[81][82][83] . Nevertheless, Andreas and Conway [77] have indicated that the pseudo-capacitive contribution of surface oxygenated groups is negligible at neutral pH but Bichat et al [71] have affirmed that pseudo-Faradaic reactions with seaweed derived carbon are possible in 0.5M Na 2 SO 4 with adequate surface functionalities on the carbon surface.…”