A kind of preparation method of carbon-coated manganese molybdate single crystal microrod
A carbon-coated manganese molybdate single crystal and microrod technology, which is applied in the preparation/purification of carbon, single crystal growth, single crystal growth, etc., can solve the problems of serious volume change, slow reaction kinetics, etc., and achieve raw material cost Low, electrochemical performance improvement, and low-temperature synthesis convenience
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Embodiment 1
[0023] 7 mmol Mn(CH 3 COO) 2 4H 2 O, 1 mmol (NH 4 ) 6 Mo 7 o 24 4H 2 O was placed in a beaker and 50 mL of deionized water was added, stirred at 50 °C for 4 h, and then centrifuged at 4000 rpm to obtain the manganese molybdate precursor, which was dried in an oven at 60 °C for 12 h. Then it was transferred to the sintering equipment, and the heating rate was 2 ℃ / min under nitrogen as a protective gas to reach 500 ℃, and then kept for 2 h. After cooling to room temperature, manganese molybdate single crystal microrods were obtained, which was named MnMoO 4 -1. figure 1 MnMoO 4 -1 XRD with standard cards (JCPDs MnMoO 4 No.72-0285) consistent, without obvious miscellaneous peaks, showing good crystallinity. figure 2 for MnMoO 4 The SEM image of -1 shows that the material is a microrod structure, the diameter of the microrod is 400-500 nm, the length is 6-7 µm, and the surface is smooth. image 3 MnMoO 4 -1 at 0.1, 0.2, 0.5, 1 and 2 A g -1 Rate performance graphs a...
Embodiment 2
[0025] 7 mmol Mn(CH 3 COO) 2 4H 2 O, 2 mmol (NH 4 ) 6 Mo 7 o 24 4H 2 O was placed in a beaker and 50 mL of deionized water was added, stirred at 50 °C for 4 h, and then centrifuged at 4000 rpm to obtain the manganese molybdate precursor, which was dried in an oven at 60 °C for 12 h. Then it was transferred to the sintering equipment, and the heating rate was 2 ℃ / min under nitrogen as a protective gas to reach 500 ℃, and then kept for 2 h. After cooling to room temperature, manganese molybdate single crystal microrods were obtained, which was named MnMoO 4 -2. figure 1 MnMoO 4 -2 XRD and standard card (JCPDs MnMoO 4 No.72-0285) consistent, without obvious miscellaneous peaks, showing good crystallinity. image 3 MnMoO 4 -2 at 0.1, 0.2, 0.5, 1 and 2 A g -1 Rate performance graphs at current densities show that as an anode material for Na-ion batteries, 0.1 A g -1 Stable capacity at 140 mAh g at current density -1 around, at 2 A g -1 60mAh g at current density -1...
Embodiment 3
[0027] 14 mmol Mn(CH 3 COO) 2 4H 2 O, 1 mmol (NH 4 ) 6 Mo 7 o 24 4H 2 O was placed in a beaker and 50 mL of deionized water was added, stirred at 50 °C for 4 h, and then centrifuged at 4000 rpm to obtain the manganese molybdate precursor, which was dried in an oven at 60 °C for 12 h. Then it was transferred to the sintering equipment, and the heating rate was 2 ℃ / min under nitrogen as a protective gas to reach 500 ℃, and then kept for 2 h. After cooling to room temperature, manganese molybdate single crystal microrods were obtained, which was named MnMoO 4 -3. figure 1 MnMoO 4 -3 XRD and standard card (JCPDs MnMoO 4 No.72-0285) consistent, without obvious miscellaneous peaks, showing good crystallinity. image 3 MnMoO 4 -3 at 0.1, 0.2, 0.5, 1 and 2 A g -1 Rate performance graphs at current densities show that as an anode material for Na-ion batteries, 0.1 A g -1 Stable capacity at 70 mAh g at current density -1 around, at 2 A g -1 20mAh g at current density -1...
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