A method for electrochemically preparing helical carbon nanotubes using molten salts
A carbon nanotube and electrochemical technology, applied in the field of carbon materials, can solve the problems of catalyst residue, large catalyst usage, and high requirements, and achieve the effects of simple process operation, no catalyst pollution, and regular morphology.
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Embodiment 1
[0020] With Li 2 CO 3 、Na 2 CO 3 、K 2 CO 3 (the molar ratio is Li 2 CO 3 :Na 2 CO 3 :K 2 CO 3 =43.5:31.5:25) mixed molten salt as electrolyte, add 10 -4 mol% Li 2 O adjusts pH. The platinized titanium electrode is used as the anode, the high-purity graphite is used as the cathode, 550°C is selected as the electrolysis temperature, and the cathode current density is 0.1mA / cm 2 Carry out constant current electrolysis for 10h. After the electrolysis, the cathode is washed with water and then dried, and the high-purity graphite electrode of the cathode is electrodeposited to obtain spiral carbon nanowires. The SEM figure and attached figure 1 unanimous.
Embodiment 2
[0022] With Li 2 CO 3 、K 2 CO 3 (the molar ratio is Li 2 CO 3 :K 2 CO 3 =50:50) mixed molten salt as electrolyte, adding 10 - 6 mol%K 2 O adjusts pH. The platinum electrode was used as the anode, the high-purity graphite was used as the cathode, 850°C was selected as the electrolysis temperature, and the constant voltage electrolysis was carried out for 1 hour with a cell voltage of 4.5V. After the electrolysis, the cathode was washed with water and dried, and the carbon product SEM ( figure 1 ) results show that helical carbon nanowires were obtained by electrodeposition on the cathode high-purity graphite electrode. It can be seen from the figure that the carbon products all exhibit a helical structure, and the diameter of the helical tube is about 150-200 nm, and the size is uniform.
Embodiment 3
[0024] With Li 2 CO 3 As an electrolyte, add 10 -4 mol% Li 2 O adjusts pH. The platinum electrode is used as the anode, the high-purity graphite is used as the cathode, 800°C is selected as the electrolysis temperature, and the cathode current density is 100mA / cm 2 Carry out constant current electrolysis for 0.5h. After the electrolysis, the cathode was washed with water and dried, and the carbon product SEM ( figure 1 ) results show that helical carbon nanowires were obtained by electrodeposition on the cathode high-purity graphite electrode. The SEM figure and attached figure 1 unanimous.
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