Co₃O₄ Hollow Nanoparticles Embedded in Mesoporous Walls of Carbon Nanoboxes for Efficient Lithium Storage

Abstract

Confining nanostructured electrode materials in porous carbon represents an effective strategy for improving the electrochemical performance of lithium-ion batteries. Herein, we report the design and synthesis of hybrid hollow nanostructures composed of highly dispersed Co 3 O 4 hollow nanoparticles (sub-20 nm) embedded in the mesoporous walls of carbon nanoboxes (denoted as H-Co 3 O 4 @MCNBs) as an anode material for lithium-ion batteries. The facile metalorganic framework (MOF)-engaged strategy for the synthesis of H-Co 3 O 4 @MCNBs involves chemical etching-coordination and subsequent two-step annealing treatments. Owing to the unique structural merits including more active interfacial sites, effectively alleviated volume variation, good and stable electrical contact, and easy access of Li + ions, the H-Co 3 O 4 @MCNBs exhibit excellent lithium-storage performance in terms of high specific capacity, excellent rate capability, and cycling stability.

Trimetallic Spinel NiCo2−xFexO4 Nanoboxes for Highly Efficient Electrocatalytic Oxygen Evolution

“…After etching by TA, the ZIF‐67 NCs are converted to TA‐Co NBs. The typical field‐emission scanning electron microscopy (FESEM) image, transmission electron microscopy (TEM) image and X‐ray diffraction (XRD) pattern display the successful synthesis of TA‐Co NBs with a uniform size distribution, well‐defined cubic morphology, smooth surface, and hollow interior (Figure S2, Supporting Information), in line with our previous work [34] . When the cation exchange reaction occurs between TA‐Co and the introduced Ni 2+ and Fe 3+ cations, the TA‐NiCoFe NBs are produced, which inherit the uniform cubic morphology with a hollow interior but rough surface (Figure 1 b–d; Figure S3, Supporting Information).…”

Simultaneously Efficient Solar Light Harvesting and Charge Transfer of Hollow Octahedral Cu2S/CdS p–n Heterostructures for Remarkable Photocatalytic Hydrogen Generation

“…5a, a characteristic absorption edge in the visible-light range can be observed at ~ 510 nm for CdS [32]. Notably, hollow octahedrons exhibit a stronger light absorption than other products due to the multiple reflections of incident light inside the hollow nanostructure [8][9][10][11][12][13][14]. The improved light capture derived from the hollow structure is expected to enhance the light response capacity of Cu 2 S/CdS for photocatalytic application.…”

“…Among various nanostructures, three-dimensional (3D) hierarchical materials received extensive attention owing to their unique physical and chemical advantages. Particularly, hollow architectures with a larger surface area and abundant reactive sites can enhance solar light utilization and photocatalytic performance [8][9][10][11][12][13][14]. For example, hierarchical Co 9 S 8 @ZnIn 2 S 4 heterostructures as photocatalysts exhibited an excellent hydrogen production rate of 6250 μmol/(g•h) for photocatalytic water splitting [12].…”

Non-spherical abrasives with ordered mesoporous structures for chemical mechanical polishing

“…As shown in Fig. 8a, the emerging adsorption bands at 1715, 1196 and 1085 cm −1 in the chelate of TA and CZT (TA-CZT) derive from the stretching vibration of the carbonyl group (C=O), phenolic hydroxyl group (Ar-OH), and carbon-oxygen bond (C-O) of TA molecule, respectively [75][76][77]. This substantiates the successful chelation between TA and dissociated metal ions in polishing slurry, which will reduce the direct emission of Zn 2+ or Cd 2+ and protect the environment.…”