Mesoporous Tubes Composed of Graphitic Carbon-Doped Co₃O₄ Nanoparticles for Lithium Storage

Abstract

The cheap biomass-derived carbon-encapsulated strategy has recently attracted much attention in enhancing the properties of metal oxide-based anodes for lithium-ion batteries (LIBs). Herein, graphitic carbon (GC)-encapsulated Co 3 O 4 material with mesoporous hierarchical structure was prepared by immersion, carbonization, and air calcination with poplar branch as a biotemplate and carbon source. We also investigated the impact of different carbon contents on the nanostructure and electrochemical performance of composites. The microtube wall of Co 3 O 4 /GC 350 oxidized at 350 °C is assembled by cross-linking Co 3 O 4 nanoparticles and graphitic carbon, making Co 3 O 4 /GC 350 possess a large specific surface area of 70.4 m 2 g −1 and a concentrated mesopore size distribution of 3.75 nm. As an anode for LIBs, Co 3 O 4 /GC 350 exhibits better lithium storage performance than the product oxidized at 450 °C. At 1 A g −1 , it delivers a stable capacity of 665.7 mA h g −1 after long cycling 1200 times and even retains a capacity of 294.1 mA h g −1 at 5 A g −1 , indicating that Co 3 O 4 /GC 350 nanomaterial has good rate performance and longcycling stability. The excellent electrochemical performance is primarily ascribed to the unique mesoporous nanostructure, large specific surface area, encapsulated GC in Co 3 O 4 /GC 350 , and the synergism of pseudocapacitive behavior arising from oxygen vacancy defects and the mesoporous structure. Therefore, the simple, eco-friendly, and large-scale poplar branch-templated strategy in this work can offer a beneficial experience for synthesizing other transition-metal oxide anodes.

Porous Co3O4/NiO@C Chains Assembled from Nanosheets with Excellent Lithium Storage Performance

“…Meanwhile, compared to the partially reported Co/Ni oxides, PCNO@C chains show an excellent cycling stability (Table S1). − ICP tests before and after the experiment are performed (Table S2), and the content of lithium ions is basically the same, indicating that lithium ions do not leach into the solution after running. Figure c displays the rate performance of PCNO@C chains, SCNO chains, and CNO chains.…”

Ultrathin nanosheet-decorated honeycomb-like Co3O4 porous balls for high performance lithium-ion batteries

“…To tackle these challenges, considerable efforts have been focused on developing strategies centered around a suitable structure, encompassing aspects such as (i) ample space to accommodate the volume changes, (ii) efficient pathways for speedy transportation of Li + ions, and (iii) elevated conductivity to facilitate the migration of electrons. 6,7 As a result, the unification of distinctive Co 3 O 4 nanostructure patterns with carbon materials (CMs) has typically been performed to realize these goals. However, while the incorporation of CMs can increase the electrical conductivity of the Co 3 O 4 based electrode during the cycling process, it may lead to a reduction in the proportion of Co 3 O 4 and consequently result in a decline in its specific capacity.…”

Tuning the Semiconducting Properties in Co3O4/PMN–PT Heterostructures by Oxygen Vacancies and Domain Structure

“…Transition metal oxide Co 3 O 4 plays an important role in data storage, sensing, and especially catalysis due to the rich surface structures. However, the low carrier mobility and high resistivity (ρ > 1 × 10 6 Ω cm) of Co 3 O 4 severely limit the related applications. , Crystal facet and cation/anion vacancy engineering have been proven to be effective in performance improvement. − Adjusting the exposed surface dramatically promotes the electrochemical properties of Co 3 O 4 by modifying the number of active sites and the atomic oxidation state of Co species. , The catalytic activity of {111}- and {112}-enclosed Co 3 O 4 nanocrystals is better than those enclosed by {100} and {110} facets. ,, The corrosion rate of different Co 3 O 4 planes increases in the order of (001) < (111) < (011) .…”

“…Transition metal oxide Co 3 O 4 plays an important role in data storage, 1 sensing, 2 and especially catalysis 3 due to the rich surface structures. However, the low carrier mobility and high resistivity (ρ > 1 × 10 6 Ω cm) of Co 3 O 4 severely limit the related applications.…”