Structural Properties of Porous Carbon Material Formation Activated with Potassium Hydroxide

Authors V.M. Vashchynskyi1, A.M. Boychuk2, Ya.B. Vashchynska3

1Separate Structural Department Technology College of Lviv Polytechnic National University, 15, Demnianska St., 79031 Lviv, Ukraine

2Vasyl Stefanyk Precarpathian National University, 57, Shevchenko St., 76018 Ivano-Frankivsk, Ukraine

3Lviv Polytechnic National University, 12, S. Bandera St., 79013 Lviv, Ukraine

Issue Volume 11, Year 2019, Number 3
Dates Received 11 January 2019; revised manuscript received 10 June 2019; published online 25 June 2019
Citation V.M. Vashchynskyi, A.M. Boychuk, Ya.B. Vashchynska, J. Nano- Electron. Phys. 11 No 3, 03012 (2019)
PACS Number(s) 84.32.Tt
Keywords Porous carbon material, Chemical activation, Small-angle X-ray spectroscopy, Specific surface area.

The paper is devoted to the study of the influence of chemical and thermal activation on the structure of carbon materials. The main parameters of the specific surface area, namely the overall area of the surface, the total volume and the mean radius of pores are determined by the methods of low-temperature porosimetry and small-angle X-ray spectroscopy. It is established that the carbon material carbonized at 300 ºС and treated with potassium hydroxide at the mass ratio of 1:4 demonstrates the largest surface area of 1608 m2/g and is characterized by a highly developed microporous surface. The increase of the carbonization temperature up to 400 °C causes a slight reduction of the surface area which is associated with an increase in pore volume compared with a change in their surface area at the fourfold content of KOH. The reason is a rise in the number of micropores with radii of 8-10 Å and an insignificant number of mesopores with a radius of ~25 Å. The greatest value of the specific area (1255 m2/g) is achieved at KOH/carbon ratio of 1:3.

List of References