High‐Loading Nano‐SnO₂ Encapsulated in situ in Three‐Dimensional Rigid Porous Carbon for Superior Lithium‐Ion Batteries

Abstract

Tin oxide nanoparticles (SnO2 NPs) have been encapsulated in situ in a three-dimensional ordered space structure. Within this composite, ordered mesoporous carbon (OMC) acts as a carbon framework showing a desirable ordered mesoporous structure with an average pore size (≈6 nm) and a high surface area (470.3 m(2) g(-1)), and the SnO2 NPs (≈10 nm) are highly loaded (up to 80 wt %) and homogeneously distributed within the OMC matrix. As an anode material for lithium-ion batteries, a SnO2 @OMC composite material can deliver an initial charge capacity of 943 mAh g(-1) and retain 68.9 % of the initial capacity after 50 cycles at a current density of 50 mA g(-1), even exhibit a capacity of 503 mA h g(-1) after 100 cycles at 160 mA g(-1). In situ encapsulation of the SnO2 NPs within an OMC framework contributes to a higher capacity and a better cycling stability and rate capability in comparison with bare OMC and OMC ex situ loaded with SnO2 particles (SnO2/OMC). The significantly improved electrochemical performance of the SnO2@OMC composite can be attributed to the multifunctional OMC matrix, which can facilitate electrolyte infiltration, accelerate charge transfer, and lithium-ion diffusion, and act as a favorable buffer to release reaction strains for lithiation/delithiation of the SnO2 NPs.

Co3O4 Nanoparticle-Decorated N-Doped Mesoporous Carbon Nanofibers as an Efficient Catalyst for Oxygen Reduction Reaction

“…This result can be further verified by the C1s spectrum. As shown in Figure 2c, the deconvoluted four peaks of the C1s spectrum at 284.7, 286.4, and 288.5 eV are associated with the pure graphitic sites; C-O and C=O bond, respectively, of which the pure graphitic sites make up most of the C1s spectrum [18][19][20][21]. Figure 2d shows the Co2p spectrum, which can further confirm the valence state of elements and detailed composition of Co3O4.…”

Constructing Ordered Three‐Dimensional TiO2 Channels for Enhanced Visible‐Light Photocatalytic Performance in CO2 Conversion Induced by Au Nanoparticles

“…As shown,t here are several intense diffractionp eaks in the XRD patterns of the three samples, which are all in agreementw ith the standard card of anatase-phase TiO 2 (JCPDS no. [49,50] Furthermore, notethat the OMT-Au composite shows aH 1-type hysteresis loop and an obvious N 2 uptake at a P/P 0 of 0.4 to 0.7, which indicates that one-dimensional cylindrical channels are present in the mesoporousm aterials.The MT-Au and P25-Aucomposites show H3-type hysteresis loops,which are associated with slit-shaped pores derived from the aggregation of platelike NPs. In addition, some well-defined characteristic XRD peaks of Au (JCPDS no.…”

Functional Species Encapsulated in Nitrogen‐Doped Porous Carbon as a Highly Efficient Catalyst for the Oxygen Reduction Reaction

“…It exhibits at ype IV curve and aH 1 type hysteresis loop, suggestingt he existence of typical cylindrical mesopores. [55] The Brunauer-Emmett-Teller (BET) surfacea rea and total pore volume are determined to be 558 m 2 g À1 and 0.47 cm 3 g À1 as shown in Table S1 (in the Supporting Information). The mesopores in the carbon framework endow the catalyst with high accessibility for electrolyte infiltration and feasible diffusion pathways for reactants.…”