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a) CV curves of MoO3 and PEDOT‐MoO3 electrodes at a scan rate of 0.1 mV s⁻¹. b) The first charge and discharge curves of MoO3 and PEDOT‐MoO3 at 0.1 A g⁻¹. c) Rate capability of MoO3 and PEDOT‐MoO3 at various current densities. d) Cycling performance of MoO3 and PEDOT‐MoO3 as AZIBs cathode at 30 A g⁻¹. e) Schematic diagram of the main composition of quasi‐solid ZIBs. f) Rate capability of PEDOT‐MoO3 as quasi‐solid‐state ZIBs cathode at various current densities (with the units of A g⁻¹). g) Cycling performance of PEDOT‐MoO3 as quasi‐solid‐state ZIBs cathode at 30 A g⁻¹.
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Aqueous Zn‐ion batteries are attracting extensive attention, but their large‐scale application is prevented by the poor electrochemical kinetics and terrible lifespan. Herein, a strategy of introducing the conductive poly(3,4‐ethylenedioxythiophene) (PEDOT) into the interlayers of α‐MoO3 is reported to systematically overcome the above shortcomings...
Citations
The kinetics and storage‐capacity of NiCoMg‐ternary layered double hydroxide (NiCoMg‐LDH) are successfully boosted by valence engineering. As the cathode for aqueous magnesium‐ion batteries (AMIBs), the assembled NiCoMg‐LDH//active carbon (AC) delivers a high specific discharge capacity (121.0 mAh·g⁻¹ at 0.2 A·g⁻¹), long‐term cycling stability (85% capacity retention after 2000 cycles at 1.0 A·g⁻¹) and an excellent performance at −30 °C. Moreover, NiCoMg‐LDH//perylenediimide (PTCDI) is assembled, achieving a high specific discharge capacity and long‐term cycling stability. X‐ray absorption spectra (XAS)/X‐ray photoelectron spectroscopy (XPS) analyses and Density functional theory (DFT) calculations disclose that the electrons are redistributed due to the 3d orbital overlap of Co/Ni atoms in NiCoMg‐LDH, which obviously reduces the valence states of Co/Ni atoms, enhances Mg─O bond strength and degree of hybridization of Co/Ni 3d and O 2p orbitals. Hence, the electronic conductivity is significantly enhanced and the electrostatic repulsion between Mg²⁺ and host layers is greatly reduced, giving rise to the improved diffusion kinetics and storage‐capacity of Mg²⁺. Furthermore, in situ Raman/X‐ray diffraction (XRD) and ex situ XPS reveal corresponding energy‐storage mechanism. This paper not only demonstrates the feasibility of LDHs as cathode for AMIBs, but also offers a new modification method of valence engineering for high‐performance electrode materials.
Photocatalysis has become increasingly pervasive in the chemical industry, profoundly impacting operational costs. However, an ideal photocatalyst must possess characteristics such as excellent reactivity, high selectivity, prolonged stability, low toxicity, and cost-effectiveness. Moreover, it should facilitate the efficient separation of photo-generated charge carriers, thereby minimizing recombination rates. In pursuit of advancing photocatalytic activity for sustainable water treatment, this investigation focused on synthesizing a groundbreaking photocatalyst, the Bismuth Ferrite@Molybdenum trioxide heterostructure, using an eco-friendly green chemistry technique with pomegranate extract. This approach aligns with the goal of environmental sustainability and represents a novel contribution to the field. Employing a comprehensive approach, advanced characterization techniques such as XRD, SEM, FT-IR, and UV-Vis were applied to analyze the material's structural, morphological, and optical properties. According to the characterization results, the heterostructure demonstrates superior photocatalytic efficiency, heightened crystallinity, and reduced recombination rates during dye degradation for water treatment compared to both individual photocatalysts. Notably, the composite catalyst exhibits a synergistic impact, outperforming individual BiFeO3 and MoO3 photocatalysts. SEM observations confirm the successful integration of rod-like MoO3 and cylindrical BiFeO3 morphologies, highlighting the strategic combination achieved through the green chemistry route. Furthermore, UV-Vis spectroscopy reveals key optical parameters, emphasizing a narrow bandgap energy of 2.74 eV with a high refractive index of 2.43 eV. The exceptional efficacy of the heterostructure in degrading dyes within the visible spectrum, surpassing expectations within a 4-hour timeframe, highlights its efficiency and precision. Remarkably, achieved degradation rates for Rhodamine B dye (98%), Methyl Blue (96%), and Methyl Orange dye (95%) underscore the promising potential of this developed photocatalytic system in effectively addressing water pollutant challenges.
Aqueous zinc‐ion batteries (AZIBs) offer advantages such as low cost, high safety, and environmental friendliness. However, the crystal structure design of cathode materials such as molybdenum oxide is of vital importance for AZIBs. Herein, a novel nanoflower‐structured molybdenum dioxide (MoO2@C) is synthesized by using MnMoO4 nanoflower‐like precursor. The presence of manganese and reduction process play a crucial role in the formation of nanoflower structure, which enhances the electrochemical performance when it is used as cathode for AZIBs. As a result, the MoO2@C cathode exhibits high initial coulombic efficiency, excellent cycling stability, and outstanding rate capability. Moreover, in situ/ex situ analysis (ex situ X‐Ray diffraction/in situ Raman spectroscopy) is used to reveal Zn‐ion storage mechanism of reversible intercalation and ultrastable structural framework.
