Influence of Activated Condition on the Structure of Diatomite-templated Carbons and Their Electrochemical Properties as Supercapacitors

Abstract

The diatomite-templated carbons were prepared using diatomite as template and furfuryl alcohol as carbon resource, and were further activated using potassium hydroxide as an activating agent. The structure, pore parameters, and electrochemical capacity of diatomite-templated carbons after activation were investigated to evaluate the influence of activated condition. The results showed active carbons contained a proportion of disordered materials in the form of amorphous carbon and ordering decreased at higher activation temperatures, however, it had little relationship to KOH/carbon mass ratio. Pore parameters, such as the specific surface area and pore volume, as well as the micropore volume, showed a growing trend with the increase of activation temperature and KOH/carbon mass ratio but micro porosity showed an opposite trend. The specific capacitance of all samples were ranging from 51.5 to 98.1 F g −1 at current density of 1 A g −1 and capacitance retention could maintain at more than 70% at current density of 20 A g −1 , indicating they had good electrochemical properties. Moreover, electrochemical property became better as activation temperature and KOH/carbon mass ratio decreased.

Influence of Morphology of Highly Ordered Mesoporous Carbon Replica on Electrochemical Properties of Air Electrodes with Pt-Ru Electrocatalyst/Carbon Replica Support in Nonaqueous Electrolyte Solution

“…These two peaks were typically observed in the Raman spectrum for carbon samples. 43,44 No peaks corresponded to Pt-Ru phase were observed in the spectrum for Pt-Ru/CR10, even though Pt-Ru/CR10 showed slightly smaller peaks than CR10. These results indicate that no major changes on the bonding structure occurred by loading the Pt-Ru electrocatalyst into the CR support.…”

Use of a diatomite template to prepare a MoS2/amorphous carbon composite and exploration of its electrochemical properties as a supercapacitor

“… 45 The chemical composition (wt%) of diatomite before and after purification was established by X-ray fluorescence spectrometry (ADVANT'XP+), as summarized in Table 1 . 46 …”

Hierarchical hollow tubular fibrous brucite-templated carbons obtained by KOH activation for supercapacitors

“…10 Therefore, based on the problems of soft and hard templates, natural minerals with unique nanopore structure, excellent thermal and mechanical stability, environmental friendliness, abundant resources and low cost have been widely concerned as templates. In recent years, a variety of natural minerals including chrysotile, 11 halloysite, 12 attapulgite, 13 sepiolite 14 (the above one-dimensional structure minerals), montmorillonite 15 (two-dimensional structure minerals), zeolite 16 and diatomite 17 (three-dimensional structure minerals) have been widely used as templates for the preparation of templated carbon materials.…”