Understanding the role of nitrogen and sulfur doping in promoting kinetics of oxygen reduction reaction and sodium ion battery performance of hollow spherical graphene

Construction of MoS2-ZnS@C Heterostructures by Multiple Organic Framework Combination for Fast and Stable Sodium/Potassium Storage

“…Notably, new peaks appearing at 165.17 and 164.02 eV correspond to the species of C–S–C 2p 3/2 , C–S–C 2p 1/2 , respectively, which confirms that sulfur has been successfully doped into the carbon layer derived from the ZIF framework. According to previous reports, more active sites could be induced by the C–S–C bonds, while the strong bond also ensures excellent mechanical support. , In addition, S doping can improve the binding of Na + to graphene, resulting in high capacity . The spectrum of N 1s for the MoS 2 -ZnS@C sample (Figure g) consists of pyridinic- N (399.89 eV), pyrrolic- N (398.55 eV), and graphitic- N (400.70 eV).…”

“…In addition, the other two peaks located at 288.8 and 286.7 eV could be assigned to C�O bonds and C−N/C−S bonds, respectively. 31,32 According to comparative XPS analysis of Mo 3d as shown in Figure 2e, the pure MoS 2 exhibits distinct peaks at 232.38 and 229.24 eV derived from Mo 4+ ion. The peaks of MoS 2 -ZnS@C shift right to 232.14 and 229.17 eV, indicating that the electron distribution changes of Mo 3d were due to the formation of ZnS.…”

“…34,35 In addition, S doping can improve the binding of Na + to graphene, resulting in high capacity. 31 The spectrum of N 1s for the MoS 2 -ZnS@C sample (Figure 2g) consists of pyridinic-N (399.89 eV), pyrrolic-N (398.55 eV), and graphitic-N (400.70 eV). The N doping derived from the pyrolysis of the MOF framework could also improve the conductivity of the carbon matrix and facilitate ion storage.…”

NiFe nanoparticles supported on N-doped graphene hollow spheres entangled with self-grown N-doped carbon nanotubes for liquid electrolyte/flexible all-solid-state rechargeable zinc–air batteries

“…6e), which were used to simulate the surfaces of NGHS, NiFe 3 @NGHS-NCNTs, Fe@NGHS-NCNTs, Ni@NGHS-NCNTs, and NiFe 3 @NGHS-NCNTs(thick), respectively. In view of our previous work, 70 *O and *OH intermediates involved in the OER and ORR processes were adsorbed on the C atom attached to the pyridinic N atom but *OOH was adsorbed on one attached to the graphitic N atom to optimize the adsorption configurations. The corresponding calculated free energy diagram is shown in Fig.…”

High-sulfur-doped hard carbon for sodium-ion battery anodes with large capacity and high initial coulombic efficiency

“…is an effective method to enhance the structural stability and electrochemical properties of hard carbon materials by tuning the electronic and chemical properties of carbon, and thus is extensively employed to construct high-performance carbon anodes for SIBs. 6 b ,7 Nitrogen is by far the most widely studied heteroatom, which can enhance reactivity and electronic conduction by creating external defects. 8 The doping of other heteroatoms, such as sulfur, phosphorus and Se, is relatively rare compared to nitrogen and is an emerging area of research.…”