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General synthesis of complex nanotubes by gradient electrospinning and controlled pyrolysis.

Niu C, Meng J, Wang X, Han C, Yan M, Zhao K, Xu X, Ren W, Zhao Y, Xu L, Zhang Q, Zhao D, Mai L - Nat Commun (2015)

Bottom Line: The key point of this method is the gradient distribution of low-/middle-/high-molecular-weight poly(vinyl alcohol) during the electrospinning process.This simple technique is extended to various inorganic multi-element oxides, binary-metal oxides and single-metal oxides.We believe that a wide range of new materials available from our composition gradient electrospinning and pyrolysis methodology may lead to further developments in research on 1D systems.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

ABSTRACT
Nanowires and nanotubes have been the focus of considerable efforts in energy storage and solar energy conversion because of their unique properties. However, owing to the limitations of synthetic methods, most inorganic nanotubes, especially for multi-element oxides and binary-metal oxides, have been rarely fabricated. Here we design a gradient electrospinning and controlled pyrolysis method to synthesize various controllable 1D nanostructures, including mesoporous nanotubes, pea-like nanotubes and continuous nanowires. The key point of this method is the gradient distribution of low-/middle-/high-molecular-weight poly(vinyl alcohol) during the electrospinning process. This simple technique is extended to various inorganic multi-element oxides, binary-metal oxides and single-metal oxides. Among them, Li3V2(PO4)3, Na0.7Fe0.7Mn0.3O2 and Co3O4 mesoporous nanotubes exhibit ultrastable electrochemical performance when used in lithium-ion batteries, sodium-ion batteries and supercapacitors, respectively. We believe that a wide range of new materials available from our composition gradient electrospinning and pyrolysis methodology may lead to further developments in research on 1D systems.

No MeSH data available.


Related in: MedlinePlus

Characterization and electrochemical performance in sodium-ion batteries and supercapacitors.(a) TEM image of the Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes with a scale at 200 nm. (b) Charge–discharge curves of Na0.7Fe0.7Mn0.3O2 measured at 100, 200, 300 and 500 mA g−1, respectively. The inset is the CV collected at a scan rate of 5 mV s−1 in the potential range 3.0–4.5 V. (c,d) Cycling performance of Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes tested for 1,000 cycles at 100 mA g−1 and for 5,000 cycles at 500 mA g−1 (e) TEM image of Co3O4 mesoporous nanotubes with scale bar at 20 nm. (f) CV curves obtained at different scan rates from 20, 100, 300, 500 to 1,000 mV s−1, respectively. (g) Stack capacitance of Co3O4 mesoporous nanotubes versus scan rate. (h) Long cycling performance of Co3O4 mesoporous nanotubes tested for 10,000 times at a high rate of 10 V s−1.
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f5: Characterization and electrochemical performance in sodium-ion batteries and supercapacitors.(a) TEM image of the Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes with a scale at 200 nm. (b) Charge–discharge curves of Na0.7Fe0.7Mn0.3O2 measured at 100, 200, 300 and 500 mA g−1, respectively. The inset is the CV collected at a scan rate of 5 mV s−1 in the potential range 3.0–4.5 V. (c,d) Cycling performance of Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes tested for 1,000 cycles at 100 mA g−1 and for 5,000 cycles at 500 mA g−1 (e) TEM image of Co3O4 mesoporous nanotubes with scale bar at 20 nm. (f) CV curves obtained at different scan rates from 20, 100, 300, 500 to 1,000 mV s−1, respectively. (g) Stack capacitance of Co3O4 mesoporous nanotubes versus scan rate. (h) Long cycling performance of Co3O4 mesoporous nanotubes tested for 10,000 times at a high rate of 10 V s−1.

Mentions: The Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes are also composed of ultrathin carbon nanotubes (∼200 nm in diameter) and Na0.7Fe0.7Mn0.3O2 nanoparticles (∼10 nm) on the tubes (Fig. 5a). And the X-ray diffraction pattern, ICP measurement and high-resolution TEM demonstrate the rhombohedral crystal structure of Na0.7Fe0.7Mn0.3O2 (Supplementary Fig. 8). Stable voltage plateaus are observed when measured at the current densities of 100, 200, 300 and 500 mA g−1, respectively, corresponding to one pair of well-defined anodic (3.9 V) and cathodic (3.6 V) peaks (Fig. 5b). When Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes are tested at a low density of 100 mA g−1 in the potential range 3–4.5 V, 90% of the initial capacity (109 mAh g−1) is retained after 1,000 cycles (Fig. 5c). When measured at a high current density of 500 mA g−1, 70% of the initial capacity (82 mAh g−1) is maintained after cycling as long as 5,000 times, corresponding to a capacity fading of 0.0071% per cycle (Fig. 5d). Compared with the conventional Na0.7Fe0.7Mn0.3O2 nanoparticles, which were synthesized as a control sample, our Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes exhibit much higher specific capacity and better cycling performance (Supplementary Figs 8 and 9). Another comparison with those previously reported results for sodium-ion batteries reveals that our Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes demonstrate superior electrochemical performance (Supplementary Fig. 8m).


General synthesis of complex nanotubes by gradient electrospinning and controlled pyrolysis.

Niu C, Meng J, Wang X, Han C, Yan M, Zhao K, Xu X, Ren W, Zhao Y, Xu L, Zhang Q, Zhao D, Mai L - Nat Commun (2015)

Characterization and electrochemical performance in sodium-ion batteries and supercapacitors.(a) TEM image of the Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes with a scale at 200 nm. (b) Charge–discharge curves of Na0.7Fe0.7Mn0.3O2 measured at 100, 200, 300 and 500 mA g−1, respectively. The inset is the CV collected at a scan rate of 5 mV s−1 in the potential range 3.0–4.5 V. (c,d) Cycling performance of Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes tested for 1,000 cycles at 100 mA g−1 and for 5,000 cycles at 500 mA g−1 (e) TEM image of Co3O4 mesoporous nanotubes with scale bar at 20 nm. (f) CV curves obtained at different scan rates from 20, 100, 300, 500 to 1,000 mV s−1, respectively. (g) Stack capacitance of Co3O4 mesoporous nanotubes versus scan rate. (h) Long cycling performance of Co3O4 mesoporous nanotubes tested for 10,000 times at a high rate of 10 V s−1.
© Copyright Policy - open-access
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4490406&req=5

f5: Characterization and electrochemical performance in sodium-ion batteries and supercapacitors.(a) TEM image of the Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes with a scale at 200 nm. (b) Charge–discharge curves of Na0.7Fe0.7Mn0.3O2 measured at 100, 200, 300 and 500 mA g−1, respectively. The inset is the CV collected at a scan rate of 5 mV s−1 in the potential range 3.0–4.5 V. (c,d) Cycling performance of Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes tested for 1,000 cycles at 100 mA g−1 and for 5,000 cycles at 500 mA g−1 (e) TEM image of Co3O4 mesoporous nanotubes with scale bar at 20 nm. (f) CV curves obtained at different scan rates from 20, 100, 300, 500 to 1,000 mV s−1, respectively. (g) Stack capacitance of Co3O4 mesoporous nanotubes versus scan rate. (h) Long cycling performance of Co3O4 mesoporous nanotubes tested for 10,000 times at a high rate of 10 V s−1.
Mentions: The Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes are also composed of ultrathin carbon nanotubes (∼200 nm in diameter) and Na0.7Fe0.7Mn0.3O2 nanoparticles (∼10 nm) on the tubes (Fig. 5a). And the X-ray diffraction pattern, ICP measurement and high-resolution TEM demonstrate the rhombohedral crystal structure of Na0.7Fe0.7Mn0.3O2 (Supplementary Fig. 8). Stable voltage plateaus are observed when measured at the current densities of 100, 200, 300 and 500 mA g−1, respectively, corresponding to one pair of well-defined anodic (3.9 V) and cathodic (3.6 V) peaks (Fig. 5b). When Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes are tested at a low density of 100 mA g−1 in the potential range 3–4.5 V, 90% of the initial capacity (109 mAh g−1) is retained after 1,000 cycles (Fig. 5c). When measured at a high current density of 500 mA g−1, 70% of the initial capacity (82 mAh g−1) is maintained after cycling as long as 5,000 times, corresponding to a capacity fading of 0.0071% per cycle (Fig. 5d). Compared with the conventional Na0.7Fe0.7Mn0.3O2 nanoparticles, which were synthesized as a control sample, our Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes exhibit much higher specific capacity and better cycling performance (Supplementary Figs 8 and 9). Another comparison with those previously reported results for sodium-ion batteries reveals that our Na0.7Fe0.7Mn0.3O2 mesoporous nanotubes demonstrate superior electrochemical performance (Supplementary Fig. 8m).

Bottom Line: The key point of this method is the gradient distribution of low-/middle-/high-molecular-weight poly(vinyl alcohol) during the electrospinning process.This simple technique is extended to various inorganic multi-element oxides, binary-metal oxides and single-metal oxides.We believe that a wide range of new materials available from our composition gradient electrospinning and pyrolysis methodology may lead to further developments in research on 1D systems.

View Article: PubMed Central - PubMed

Affiliation: State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China.

ABSTRACT
Nanowires and nanotubes have been the focus of considerable efforts in energy storage and solar energy conversion because of their unique properties. However, owing to the limitations of synthetic methods, most inorganic nanotubes, especially for multi-element oxides and binary-metal oxides, have been rarely fabricated. Here we design a gradient electrospinning and controlled pyrolysis method to synthesize various controllable 1D nanostructures, including mesoporous nanotubes, pea-like nanotubes and continuous nanowires. The key point of this method is the gradient distribution of low-/middle-/high-molecular-weight poly(vinyl alcohol) during the electrospinning process. This simple technique is extended to various inorganic multi-element oxides, binary-metal oxides and single-metal oxides. Among them, Li3V2(PO4)3, Na0.7Fe0.7Mn0.3O2 and Co3O4 mesoporous nanotubes exhibit ultrastable electrochemical performance when used in lithium-ion batteries, sodium-ion batteries and supercapacitors, respectively. We believe that a wide range of new materials available from our composition gradient electrospinning and pyrolysis methodology may lead to further developments in research on 1D systems.

No MeSH data available.


Related in: MedlinePlus