β-VO2/carbon nanotubes core-shelled microspheres and their applications for advanced cathode in aqueous zinc ion batteries

Boosting the Rate Capability of Aqueous Zinc-Ion Batteries Using VNxOy/C Spheres Derived from a Self-Assembled V-polydopamine Complex

“…The introduction of a highly electronegative N element results in a stronger chemical interaction (Figure f). Three characteristic peaks located at 530, 531.6, and 533.1 eV in the O 1s spectra are detected, corresponding to V–O, C–O, and O–H, respectively (Figure g). , As shown in Figure h, the peaks of V 2 O 3 /C located at 398.6, 399.8, and 400.7 eV correspond to pyridinic N, pyrrole N, and graphitic N, respectively, and the N element is generated during the pyrolysis of the V-PDA precursor, which might contribute to the enhancement of electrical conductivity and ion transport capacity. Interestingly, a blue shift (0.9 eV) appears for the binding energy of pyridinic N in VN x O y /C, which is mainly due to the formation of the V–N bond and consistent with the results of the V 2p spectra.…”

“…In addition to the different positions of the above bonds, the obvious difference between V x O y /C and VN x O y /C is the change in the value of I D / I G . As we know, the D-band is related to the breathing mode of sp 2 atoms in rings and the production of the defects when it is in active state, while the G-band corresponds to the sp 2 hybridized carbon atoms . The broad peaks of the D- and G-bands indicate an amorphous carbon structure.…”

“…Three characteristic peaks located at 530, 531.6, and 533.1 eV in the O 1s spectra are detected, corresponding to V−O, C−O, and O−H, respectively (Figure 3g). 58,59 As shown in Figure 3h, the peaks of V 2 O 3 /C located at 398.6, 399.8, and 400.7 eV correspond to pyridinic N, pyrrole N, and graphitic N, 57 0.2 mV s −1 , while the three cathodic peaks at 0.41, 0.77, and 0.99 V appear with the increase in the scan rate (Figure 5a).…”

Atomic Layer-Deposited ZnO Layer on Hydrated Vanadium Dioxide Cathodes against Vanadium Dissolution for Stable Zinc Ion Batteries

“…To solve vanadium dissolution, many strategies have been proposed, such as electrolyte optimization, − guest species preintercalation, − surface modification, and so on. − Electrolyte optimization has been reported as an effective strategy to prevent V dissolution. Zhang et al designed aqueous organic electrolytes , and high-concentration electrolytes, , which can sustain the stable operation of Zn anodes and diverse cathode materials such as vanadium pentoxide, manganese dioxide, and zinc hexacyanoferrate.…”

Pseudocapacitive Contribution in Amorphous FeVO4 Cathode for Lithium‐Ion Batteries

“…In efforts of developing urgently needed next-generation electrode materials, vanadium oxides [1][2][3][4][5] and metal-vanadiumbased oxides [6][7][8] have attracted much attention as potential materials for rechargeable LIBs, sodium-ion batteries, [9] potassium-ion batteries [10] and zinc-ion batteries [5] due to their low cost, superior safety, and high theoretical specific capacity. It is well known that Fe and V are abundant in the earth's crust, which makes iron vanadate much cheaper than most the other transition-metal-based electrode materials, so it can be a promise cheap electrode alternative.…”