Nanoporous Activated Carbons Derived from Agro-Waste Corncob for Enhanced Electrochemical and Sensing Performance

Abstract

Nanoporous activated carbons (AC) have been prepared from low-cost agro-waste corncob powder by phosphoric acid activation and investigated for their electrochemical supercapacitor and sensing properties. Surface areas and pore volumes are found in the range of 690–1288 m2 g−1 and 0.49–1.64 cm3 g−1, respectively and could be controlled by adjusting the weight ratio of corncob and phosphorous. The corncob-derived AC showed excellent electrochemical performance giving a maximum specific capacitance ca. 340.8 F g−1 at a scan rate of 5 mV s−1. At relatively a high scan rate of 100 mV s−1 the specific capacitance of 133.7 F g−1 was obtained. About 96% capacitance retention rate was achieved even after 1000 cycles demonstrating potential usages of the materials in high-performance supercapacitor electrodes. Furthermore, our AC showed excellent solvent vapor sensing performance with high selectivity for ammonia.

Wool Carpet Dye Adsorption on Nanoporous Carbon Materials Derived from Agro-Product

“…For instance, pore volume limits the size of molecules that can be adsorbed, and surface area determines the amount of material that The SEM image reveals that NCM_1_600 contains fine granules (average size ~70 µm) having large number of macropores on the surface (Figure 1a-c). The homogeneous distribution of mesopores that can be seen in the high-resolution SEM ( Figure 1d) and TEM image (Figure 1e) demonstrates the uniform carbonization/or activation of the bamboo cane precursor [30][31][32][33]. The HR-TEM image (Figure 1f) confirmed the amorphous structure of NCM_1_600, which is common to most activated carbons prepared from natural precursors.…”

Polyaniline/MoSX Supercapacitor by Electrodeposition

“…3941 According to the deconvolution analysis of Mo 3d and S 2p, we can infer that the main 36 which is very consistent with our measurement here. These findings lead to a conclusion that MoS 3 and MoS 2 are formed during the electrodeposition process, especially the dominated component is MoS 3 . In this way, the thin layer molybdenum sulfide will be referred to as MoS X in the following paragraph.…”

Nanoarchitectonic‐Based Material Platforms for Environmental and Bioprocessing Applications

“…To achieve green synthesis of functional nanoporous materials, nanoporous carbon materials were prepared through phosphoric acid activation of low‐cost agro‐waste corncob powders . The synthesized nanoporous carbon materials showed rather good maximum specific capacitance with stable capacitance retention even after 1000 cycles.…”