A Comparative Study of the Influence of Nitrogen Content and Structural Characteristics of NiS/Nitrogen-Doped Carbon Nanocomposites on Capacitive Performances in Alkaline Medium

Abstract

Supercapacitors (SCs) have been regarded as alternative electrochemical energy storage devices; however, optimizing the electrode materials to further enhance their specific energy and retain their rate capability is highly essential. Herein, the influence of nitrogen content and structural characteristics (i.e., porous and non-porous) of the NiS/nitrogen-doped carbon nanocomposites on their electrochemical performances in an alkaline electrolyte is explored. Due to their distinctive surface and the structural features of the porous carbon (A-PVP-NC), the as-synthesized NiS/A-PVP-NC nanocomposites not only reveal a high wettability with 6 M KOH electrolyte and less polarization but also exhibit remarkable rate capability (101 C/g at 1 A/g and 74 C/g at 10 A/g). Although non-porous carbon (PI-NC) possesses more nitrogen content than the A-PVP-NC, the specific capacity output from the latter at 10 A/g is 3.7 times higher than that of the NiS/PI-NC. Consequently, our findings suggest that the surface nature and porous architectures that exist in carbon materials would be significant factors affecting the electrochemical behavior of electrode materials compared to nitrogen content.

Constructing a Carbon-Encapsulated Carbon Composite Material with Hierarchically Porous Architectures for Efficient Capacitive Storage in Organic Supercapacitors

“…Besides, it is meaningful to discuss the intensity ratio between D and G bands ( I D / I G ) because the degree of defects within the carbonaceous materials can be further evaluated. The value calculated from the H@H was 1.16, the same as the H-HPAC and close to that of the A-PVP-NC (1.18) [ 21 ]. The high I D / I G ratio suggests that many defects and/or highly disordered degrees exist, as is generally observed in the carbonaceous materials with numerous functional groups [ 23 , 24 ].…”

“…Undoubtedly, utilizing a template and activation are straightforward approaches for synthesizing the HPAC [ 14 , 17 ]. Even so, it will be highly appreciated if the greener templates and activators were chosen owing to resolve environmental issues and promote cost-effectiveness issues [ 9 , 18 , 19 , 20 , 21 ].…”

In Situ Growth of W2C/WS2 with Carbon-Nanotube Networks for Lithium-Ion Storage

“…In order to investigate the lithium-storage mechanism, the CV curves at scan rates from 10 to 100 mV s −1 , and the logarithm plot of peak currents with logarithm of scan rates are shown in Figure S5 . The capacitive and diffusion contribution can be evaluated by the b factor in the following equation [ 61 ]: where i is the current density, v is the scan rate, k and b are adjustable factors. When b = 1, the storage mechanism is capacitive; when b = 0.5, the storage mechanism is diffusion.…”

Reduced Graphene-Oxide-Encapsulated MoS2/Carbon Nanofiber Composite Electrode for High-Performance Na-Ion Batteries

“…There is no difference between the E 1 2g and A 1g mode peaks for MoS 2 @CNFs and MoS 2 @CNFs@rGO, indicating that the MoS 2 nanoflakes in the CNFs maintain their structures without damage during the fabrication process. Furthermore, introducing the rGO layer increases the intensity of the D and G bands, which indicates the carbon structure (Figure 5b and Figure S3) [31,32]. The integrated area ratio of sp 3 to sp 2 (Asp 3 /Asp 2 ) has been proven to provide useful information concerning the nature of carbon [32].…”

“…Furthermore, introducing the rGO layer increases the intensity of the D and G bands, which indicates the carbon structure (Figure 5b and Figure S3) [31,32]. The integrated area ratio of sp 3 to sp 2 (Asp 3 /Asp 2 ) has been proven to provide useful information concerning the nature of carbon [32]. The low ratio of Asp 3 /Asp 2 indicates the presence of a large amount of sp 2 carbon.…”