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Synthesis of Mn3O 4-Based Aerogels and Their Lithium-Storage Abilities.

Tang H, Sui Y, Zhu X, Bao Z - Nanoscale Res Lett (2015)

Bottom Line: In the process, supercritical ethanol acted as a reductant to reduce graphene oxide and MnO2 gels simultaneously.The results showed that Mn3O4 aerogels as anode materials exhibited a reversible capacity of 498.7 mAh/g after 60 charge/discharge cycles while the reversible capacity for Mn3O4/GN composite aerogels could further increase to 665 mAh/g.The mechanisms for the enhanced capacity retention could be attributed to their porous structures and improved electronic contact with GN addition.

View Article: PubMed Central - PubMed

Affiliation: School of Mathematics and Physics, Jiangsu University of Technology, 1801 Zhongwu Road, Changzhou, 213001, China, tangh@126.com.

ABSTRACT
Mn3O4 aerogels and their graphene nanosheet (GN) composite aerogels were synthesized by a simple supercritical-ethanol process. In the process, supercritical ethanol acted as a reductant to reduce graphene oxide and MnO2 gels simultaneously. The synthesized aerogels consisted of 10-20 nm Mn3O4 nanocrystallites, with BET-specific surface areas around 60 m(2)/g. The performance of the aerogels as anode materials for lithium-ion batteries was also evaluated in this study. The results showed that Mn3O4 aerogels as anode materials exhibited a reversible capacity of 498.7 mAh/g after 60 charge/discharge cycles while the reversible capacity for Mn3O4/GN composite aerogels could further increase to 665 mAh/g. The mechanisms for the enhanced capacity retention could be attributed to their porous structures and improved electronic contact with GN addition. The process should also offer an effective and facile method to fabricate many other porous metal oxide/GN nanocomposites for low-cost, high-capacity, environmentally benign material for lithium-ion batteries.

No MeSH data available.


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Typical TEM image of Mn3O4/GN composite aerogels and their SAED pattern (inset). White arrows indicate the edges of GN
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Fig5: Typical TEM image of Mn3O4/GN composite aerogels and their SAED pattern (inset). White arrows indicate the edges of GN

Mentions: The bright field TEM image (Fig. 5) of the resulting Mn3O4/GN nanocomposite products confirms that the 10–20 nm Mn3O4 nanoparticles decorated on the surface of GN. A selected area electron diffraction (SAED) pattern of the final products is shown in the insert of Fig. 5. All the concentric diffraction rings are related to the phase of Mn3O4, consistent with the relevant XRD analyses. Surface area, pore size, and pore volume are important characteristics for aerogel materials. The data related with Mn3O4 aerogels and Mn3O4/GN aerogels are summarized in Table 1. Nitrogen adsorption/desorption isotherms (Additional file 1: Figure S4) of the Mn3O4 aerogels and Mn3O4/GN composite aerogels are type IV isotherms with H1 hysteresis loops, which are characteristic of an interconnected mesoporous system with cylindrical pores. BET-specific surface areas are 69 and 67 m2/g, respectively. The BET-specific areas are not as high as the reported value (~200 m2/g) of MnO2 aerogels [17], which might be due to crystallization and coarsening of Mn3O4 in the supercritical-ethanol process at relative high temperature and pressure.Fig. 5


Synthesis of Mn3O 4-Based Aerogels and Their Lithium-Storage Abilities.

Tang H, Sui Y, Zhu X, Bao Z - Nanoscale Res Lett (2015)

Typical TEM image of Mn3O4/GN composite aerogels and their SAED pattern (inset). White arrows indicate the edges of GN
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4478184&req=5

Fig5: Typical TEM image of Mn3O4/GN composite aerogels and their SAED pattern (inset). White arrows indicate the edges of GN
Mentions: The bright field TEM image (Fig. 5) of the resulting Mn3O4/GN nanocomposite products confirms that the 10–20 nm Mn3O4 nanoparticles decorated on the surface of GN. A selected area electron diffraction (SAED) pattern of the final products is shown in the insert of Fig. 5. All the concentric diffraction rings are related to the phase of Mn3O4, consistent with the relevant XRD analyses. Surface area, pore size, and pore volume are important characteristics for aerogel materials. The data related with Mn3O4 aerogels and Mn3O4/GN aerogels are summarized in Table 1. Nitrogen adsorption/desorption isotherms (Additional file 1: Figure S4) of the Mn3O4 aerogels and Mn3O4/GN composite aerogels are type IV isotherms with H1 hysteresis loops, which are characteristic of an interconnected mesoporous system with cylindrical pores. BET-specific surface areas are 69 and 67 m2/g, respectively. The BET-specific areas are not as high as the reported value (~200 m2/g) of MnO2 aerogels [17], which might be due to crystallization and coarsening of Mn3O4 in the supercritical-ethanol process at relative high temperature and pressure.Fig. 5

Bottom Line: In the process, supercritical ethanol acted as a reductant to reduce graphene oxide and MnO2 gels simultaneously.The results showed that Mn3O4 aerogels as anode materials exhibited a reversible capacity of 498.7 mAh/g after 60 charge/discharge cycles while the reversible capacity for Mn3O4/GN composite aerogels could further increase to 665 mAh/g.The mechanisms for the enhanced capacity retention could be attributed to their porous structures and improved electronic contact with GN addition.

View Article: PubMed Central - PubMed

Affiliation: School of Mathematics and Physics, Jiangsu University of Technology, 1801 Zhongwu Road, Changzhou, 213001, China, tangh@126.com.

ABSTRACT
Mn3O4 aerogels and their graphene nanosheet (GN) composite aerogels were synthesized by a simple supercritical-ethanol process. In the process, supercritical ethanol acted as a reductant to reduce graphene oxide and MnO2 gels simultaneously. The synthesized aerogels consisted of 10-20 nm Mn3O4 nanocrystallites, with BET-specific surface areas around 60 m(2)/g. The performance of the aerogels as anode materials for lithium-ion batteries was also evaluated in this study. The results showed that Mn3O4 aerogels as anode materials exhibited a reversible capacity of 498.7 mAh/g after 60 charge/discharge cycles while the reversible capacity for Mn3O4/GN composite aerogels could further increase to 665 mAh/g. The mechanisms for the enhanced capacity retention could be attributed to their porous structures and improved electronic contact with GN addition. The process should also offer an effective and facile method to fabricate many other porous metal oxide/GN nanocomposites for low-cost, high-capacity, environmentally benign material for lithium-ion batteries.

No MeSH data available.


Related in: MedlinePlus