Enhanced Electrosorption Capacitance of Porous Carbon Particles Synthesized by Spray Pyrolysis

Abstract

Porous carbon particles with a spherical shape were prepared by a spray pyrolysis process using sucrose and NaHCO3. The prepared carbon particles had macropores (40 ∼ 50 nm) as well as mesopores with specific surface areas of 669 and 825 m2/g when the ratio of NaHCO3 to sucrose was 1.0 and 3.0, respectively. Many surface functional groups such as C = O, C-O and OH were generated and could improve the wettability of the synthesized carbon. Clear G and D bands in Raman spectra were observed, indicating that the prepared carbon particles have a graphite-like structure. Electrochemical properties of the prepared carbon particles were investigated by the cyclic voltammetry and electrical impedance analysis. Compared with the commercially-available activated carbon, the porous carbon particles prepared by the spray pyrolysis showed an improved electrosorption capacitance. The increase of the effective surface area for the ion sorption due to the existence of macropores with mesopores, as well as the existence of many surface functional groups, were responsible for the improvement of the electrosorption capacitance.

Hierarchical Porous Carbon by Ultrasonic Spray Pyrolysis Yields Stable Cycling in Lithium–Sulfur Battery

“…Upon complete evaporation of the solvent and the subsequent carbonization of the chelated compound, the outer microporous carbon shell is formed . Furthermore, it has been known that the sizes of the meso- or macropores can be controlled by changing the sucrose/Na 2 CO 3 ratio in the precursor solution. , The formation mechanism is commensurate with that of the salt-assisted spray pyrolysis by Okuyama group that was used for synthesis of metal oxide nanoparticles . Detailed experimental procedure is described in the Supporting Information Experimental Procedures.…”

A new strategy of spray pyrolysis to prepare porous carbon nanosheets with enhanced ionic sorption capacity

“…Recently, the ultrasonic spray pyrolysis has attracted great attention as a promising process to synthesize various carbon-based porous materials due to the advantages of its simplicity, continuous production, and one-pot process. [38][39][40][41][42][43][44][45][46][47] A typical spray pyrolysis process produces particles via a droplet-to-particle conversion mechanism. The process has the advantage of controlling the composition of multi-component materials, easily and precisely.…”