Preparation of Network-Structured Carbon Nanofiber Mats Based on PAN Blends Using Electrospinning and Hot-Pressing Methods for Supercapacitor Applications

Abstract

In this work, we prepared network-structured carbon nanofibers using polyacrylonitrile blends (PAN150 and PAN85) with different molecular weights (150,000 and 85,000 g mol−1) as precursors through electrospinning/hot-pressing methods and stabilization/carbonization processes. The obtained PAN150/PAN85 polymer nanofibers (PNFs; PNF-73, PNF-64 and PNF-55) with different weight ratios of 70/30, 60/40 and 50/50 (w/w) provided good mechanical and electrochemical properties due to the formation of physically bonded network structures between the blended PAN nanofibers during the hot-processing/stabilization processes. The resulting carbonized PNFs (cPNFs; cPNF-73, cPNF-64, and cPNF-55) were utilized as anode materials for supercapacitor applications. cPNF-73 exhibited a good specific capacitance of 689 F g−1 at 1 A g−1 in a three-electrode set-up compared to cPNF-64 (588 F g−1 at 1 A g−1) and cPNF-55 (343 F g−1 at 1 A g−1). In addition, an asymmetric hybrid cPNF-73//NiCo2O4 supercapacitor device also showed a good specific capacitance of 428 F g−1 at 1 A g−1 compared to cPNF-64 (400 F g−1 at 1 A g−1) and cPNF-55 (315 F g−1 at 1 A g−1). The cPNF-73-based device showed a good energy density of 1.74 W h kg−1 (0.38 W kg−1) as well as an excellent cyclic stability (83%) even after 2000 continuous charge–discharge cycles at a current density of 2 A g−1.

A Facile Fabrication of Ordered Mesoporous Carbons Derived from Phenolic Resin and Mesophase Pitch via a Self-Assembly Method

“…It was further confirmed by TEM analysis. As shown in Figure 4 , the OMC-meso-10 showed an ordered hexagonal arrangement of mesopores (particularly, a long-range hexagonal arrangement) with the (001) and (110) directions, which indicates a highly ordered mesostructure [ 20 ]. Interestingly, the OMC-meso-20 exhibited worm-like structures with less mesopore patterning.…”

“…The charge–discharge properties of the MC and OMC materials were verified by the GCD test. The specific capacitance ( SC , F g −1 ) was obtained using the following equation, [ 20 , 21 ]: where I is the applied current density for GCD (A), Δ t is the required time for discharge (s), m is the active mass (g) of the electrode material (MC and OMC), and Δ V is the active potential window (V) in GCD profile. The electrochemical impedance measurements were recorded in the frequency range between 100 kHz to 1 Hz at open-circuit voltage and the data were presented in Nyquist plots.…”

Promotion of adipose stem cell transplantation using GelMA hydrogel reinforced by PLCL/ADM short nanofibers

“…PLCL (BIOMQ, China) and ADM (Marine Biomedical Research Institute of Qingdao) was dissolved in HFIP (Chembee, China) at various ratios (10:0, 7:3, 5:5, 3:7, and 0:10) (w/w) and stirred overnight to obtain homogeneous solutions of 10% (w/v). The nanofiber composition ratio was determined based on the previous research methods [41][42][43][44][45][46][47] and the preliminary evaluation results of this study for the nanofiber composition ratio (figure S1). When electrospinning, the flow rate was 3 ml h −1 , and the voltage was set to 13 kV.…”