Three-Dimensional Molybdenum Diselenide Helical Nanorod Arrays for High-Performance Aluminum-Ion Batteries

Abstract

The rechargeable aluminum-ion battery (AIB) is a promising candidate for next-generation high-performance batteries, but its cathode materials require more development to improve their capacity and cycling life. We have demonstrated the growth of MoSe 2 three-dimensional helical nanorod arrays on a polyimide substrate by the deposition of Mo helical nanorod arrays followed by a low-temperature plasma-assisted selenization process to form novel cathodes for AIBs. The binder-free 3D MoSe 2 -based AIB shows a high specific capacity of 753 mAh g −1 at a current density of 0.3 A g −1 and can maintain a high specific capacity of 138 mAh g −1 at a current density of 5 A g −1 with 10 000 cycles. Ex situ Raman, XPS, and TEM characterization results of the electrodes under different states confirm the reversible alloying conversion and intercalation hybrid mechanism during the discharge and charge cycles. All possible chemical reactions were proposed by the electrochemical curves and characterization. Further exploratory works on interdigital flexible AIBs and stretchable AIBs were demonstrated, exhibiting a steady output capacity under different bending and stretching states. This method provides a controllable strategy for selenide nanostructure-based AIBs for use in future applications of energy-storage devices in flexible and wearable electronics.

Phosphorus‐Doping‐Induced Optimization of Atomic Hydrogen Binding Energy in MoSe2 under High Coverage for Efficient Electrocatalytic Hydrogen Evolution Reactions

“…The intense peaks centered at 1334 and 1584 cm À 1 were ascribed to pure CFP and the peaks at 237 and 282 cm À 1 were assigned to the A 1g and E 1 2g specific modes of 2H-MoSe 2 , respectively. [30] The E 1 2g peak was much weaker than the A 1g peak, which is characteristic of the edge-abundant structure of MoSe 2 nanosheets. Unlike the A 1g and E 1 2g peaks of raw and annealed MoSe 2 , those of P-doped MoSe 2 were redshifted by approximately 2.6 cm À 1 .…”

“…The Raman spectra of the as‐prepared P‐doped MoSe 2 /CFP, annealed MoSe 2 /CFP, raw MoSe 2 /CFP, and CFP are presented in Figure 1(c). The intense peaks centered at 1334 and 1584 cm −1 were ascribed to pure CFP and the peaks at 237 and 282 cm −1 were assigned to the A 1g and E 1 2g specific modes of 2H‐MoSe 2 , respectively [30] . The E 1 2g peak was much weaker than the A 1g peak, which is characteristic of the edge‐abundant structure of MoSe 2 nanosheets.…”

Reversible Intercalation of Al‐Ions in Poly(3,4‐Ethylenedioxythiophene):Poly(4‐Styrenesulfonate) Electrode for Aqueous Electrochemical Capacitors with High Energy Density

“…Here the limited time and the large polarization indicated that the Al‐ions intercalation rarely happened, which were in good accordance with characteristics of high‐valent ions storage mechanism. [ 22,34 ] The results indicate that the Al 3+ insertion/extraction is a relatively slow kinetic reaction process that only happened at lower current density processes. Compared with the same tests in 1.2 m H 2 SO 4 electrolyte as shown in Figure S4, Supporting Information, the electrodes displayed higher capacitance in Al 3+ electrolyte than H + electrolyte at low current densities due to the three‐electrons transfer.…”

Vertically Aligned Graphene‐Analogous Low‐Dimensional Materials: A Review on Emerging Trends, Recent Developments, and Future Perspectives

“…[ 175 ] Table 3 summarizes the energy storage performance of different 2D materials in vertically aligned orientation as electrodes of Li, Na, and Al batteries. [ 123,211,175,178–194 ] SnS 2 @C anode delivered an initial discharge and charge capacities of 1851 and 1156 mAh g –1 as compared to the lower values of 1304 and 755 mAh g –1 for pure SnS 2 anode. The reported coulombic efficiency of the SnS 2 @C anode was 62.5% as compared to 57.9% for pure SnS 2 with high stability after 200 cycles.…”