Facile synthesis of hierarchical g-C3N4@WS2 composite as Lithium-ion battery anode

In Situ Fabrication of NiS2 Nanoparticle-Coated g-C3N4 as a Cathode for Enhanced Lithium Thermal Battery Performance

“…The average total polarization of 5NCN is pretty low (approximately 0.0528 Ω), which is smaller than that of 2NCN (0.1435 Ω), indicating that the coated layer g-C 3 N 4 can facilitate ion diffusion and electron transfer performance to boost the large current discharge for thermal batteries …”

“…The average total polarization of 5NCN is pretty low (approximately 0.0528 Ω), which is smaller than that of 2NCN (0.1435 Ω), indicating that the coated layer g-C 3 N 4 can facilitate ion diffusion and electron transfer performance to boost the large current discharge for thermal batteries. 54 Meanwhile, electrochemical impedance spectroscopy (EIS) analysis was performed to study the kinetics of 2NCN and 5NCN electrodes. As shown in Figure 4f, the fitting results indicate that 5NCN exhibits a lower internal system resistance R s (0.18 Ω) compared with 2NCN (0.32 Ω).…”

High-Performance Lithium-Ion Battery and Supercapacitors Using Covalent Organic Frameworks (COFs)/Graphitic Carbon Nitride (g-C3N4)-Derived Hierarchical N-Doped Carbon

“…One oxidation peak at 2.0 V on the anodic scan is due to the surface’s oxygen and nitrogen functional groups. The oxidation and reduction peaks for N-doped C/g-C 3 N 4 composite overlap from the second cycle, indicating a highly reversible electrochemical performance. , Figure b shows the discharge/charge patterns for the N-doped C/g-C 3 N 4 composite at a current density of 50 mA·g –1 between 0.005 and 3.0 V for the first five cycles. The existence of a plateau at about 0.8 V in the first cycle can be attributed to the formation of SEI films on the surfaces of the N-doped C/g-C 3 N 4 composite, which is consistent with CV observations.…”

S-Doping Promotes Pyridine Nitrogen Conversion and Lattice Defects of Carbon Nitride to Enhance the Performance of Zn–Air Batteries

“…The full spectrum of XPS shows (Figure a) that S-C 3 N 4 /CNT is mainly composed of C, N, S, and a small amount of O caused by surface oxidation. The high-resolution C 1s spectrum (Figure b) contains three deconvolution peaks of CC species (284.8 eV), C–N or/and CN species from the N-doped C host (286.2 eV), and OC–O of surface oxide (289.2 eV). − The high-resolution N 1s spectrum (Figure c) was divided into pyridine N (398.3 eV, 43.5%), pyrrole N (399.6 eV, 25.4%), and graphite N (401.4 eV, 31.1%). − Combined with the N 1s spectrum of C 3 N 4 /CNT (Figure S3), we found that the introduction of S increased the content of pyridine N from 34.1 to 43.5%, while the content of pyrrole N decreased by 13.2%, indicating that the S dopant greatly converted pyrrolic N to pyridine N. This phenomenon may be due to that the introduction of S changes the coordination environment of N. DFT calculations show that pyridine N enhances the adsorption of O 2 to adjacent carbon atoms, thereby promoting the four-electron process of ORR . Through electrochemical and physical studies, it was found that the OER active sites of nitrogen-doped carbon materials are associated with pyridine N or/and graphitic N. , Therefore, high content of pyridine nitrogen will bring more active sites for both OER and ORR.…”