Figure - available from: Journal of Materials Science: Materials in Electronics
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Schematic crystal structure of α-MoO3 and the available empty sites for Li insertion into the orthorhombic structure
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Layer-structured α-MoO3 with high theoretical capacity (1117 mAh g−1) is considered as one of the alternative anode materials for LIBs. However, the repeated insertion/extraction of Li+ often causes irregularly exfoliated layer structure of α-MoO3, especially the multiple-direction interlayer Li+ insertion/extraction shows rapid capacity decay. In...
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Research on supercapattery has been rising as the state of the art of modern energy storage devices because of its excellent efficiency in terms of power and energy density. In this aspect, layered materials supply better electrochemical attributes, but inadequacy in rate performance, which is the key factor of energy storage devices, forbids its w...
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... More importantly, as shown in Figure 1c, the lattice fringe of 0.326 nm corresponding to the (021) face of α-MoO 3 and 0.367 nm corresponding to the GDYO layer distance are observed from the HRTEM image of the MoO 3x /GDYO heterostructures. [18] The atomic arrangement is only locally ordered, with most of the region possessing an amorphous state. Moreover, it can be inferred from the edges of the heterostructures that MoO 3-x is vertically stacked in the plane of the GDYO nanosheets and has a thickness of 4.5 nm (Figure 1d). ...
Two‐dimensional semiconductor‐based nanomaterials have shown to be an effective substrate for Surface‐enhanced Raman Scattering (SERS) spectroscopy. However, the enhancement factor (EF) tends to be relatively weak compared to that of noble metals and does not allow for trace detection of molecules. In this work, we report the successful preparation of two‐dimensional (2D) amorphous non‐van der Waals heterostructures MoO3‐x/GDYO nanomaterials using supercritical CO2. Due to the synergistic effect of the localized surface plasmon resonance (LSPR) effect and the charge transfer effect, it exhibits excellent SERS performance in the detection of methylene blue (MB) molecules, with a detection limit as low as 10⁻¹⁴ M while the enhancement factor (EF) can reach an impressive 2.55×10¹¹. More importantly, the chemical bond bridging at the MoO3‐x/GDYO heterostructures interface can accelerate the electron transfer between the interfaces, and the large number of defective surface structures on the heterostructures surface facilitates the chemisorption of MB molecules. And the charge recombination lifetime can be proved by a ~1.7‐fold increase during their interfacial electron‐transfer process for MoO3‐x/GDYO@MB mixture, achieving highly sensitive SERS detection.
The vast of majority of battery electrode materials of contemporary interest are of a crystalline nature. Crystals are, by definition, anisotropic from an atomic-structure perspective. The inherent structural anisotropy may give rise to favored mesoscale orientations and anisotropic properties whether the material is in a rest state or subjected to an external stimulus. The overall perspective of this review is that intentional manipulation of crystallographic anisotropy of electrochemically active materials constitute an untapped parameter space in energy storage systems and thus provide new opportunities for materials innovations and design. To that end, we contend that crystallographically textured electrodes, as opposed to their textureless poly crystalline or single-crystalline analogs, are promising candidates for next-generation storage of electrical energy in rechargeable batteries relevant to commercial practice. This perspective is underpinned first by the fundamental─to a first approximation─uniaxial, rotation-invariant symmetry of electrochemical cells. On this basis, we show that a crystallographically textured electrode with the preferred orientation aligned out-of-plane toward the counter electrode represents an optimal strategy for utilization of the crystals' anisotropic properties. Detailed analyses of anisotropy of different types lead to a simple, but potentially useful general principle that "Pec//Pc" textures are optimal for metal anodes, and "Pec//Sc" textures are optimal for insertion-type electrodes.
Lithium-ion batteries (LIBs) have been broadly utilized in the field of portable electric equipment because of their incredible energy density and long cycling life. In order to overcome the capacity and rate bottlenecks of commercial graphite and further enhance the electrochemical performance of LIBs, it is vital to develop new electrode materials. Transition metal oxides (TMOs) have emerged as a key type of electrode material for energy storage and conversion application for their low cost, rich abundance and higher specific capacities. However, these materials have low electrical conductivity, poor ionic conductivity and ion diffusion kinetics, large volume expansion, high-voltage hysteresis, and comprehensive structural reorganization that cause poor retention in capacity. Several approaches have been employed to overcome these issues such as preparing nanostructured materials and dispersing metal oxide nanoparticles in a conductive medium such as carbon, reduced graphene oxide, and carbon nanotubes (CNT), which can reduce volume expansion, provide shorter diffusion path length and enhance the contact area. This work briefly introduces the recent progress in TMO-based nanostructure composites as electrode materials for LIBs, and some relevant prospects are also proposed.
