A kind of nano-iron nitride-carbon composite catalyst for positive electrode of lithium-air battery and preparation method thereof
A lithium-air battery and carbon composite technology, applied in the direction of battery electrodes, nanotechnology for materials and surface science, nanotechnology, etc., can solve the problems of poor conductivity and insufficient catalytic oxygen ability, achieve high conductivity, improve Effects of electronic conductivity and high specific surface area
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Embodiment 1
[0050] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:
[0051] Take 0.05mol ferric sulfate and 0.05mol trimesic acid and add them to 200ml deionized water at the same time, and add 0.02mol triethylamine as a surfactant. After magnetic stirring for 1h, ultrasonic treatment for 0.5h, a uniformly dispersed precursor solution is obtained. , placed in a condensing reflux device, heated to 50°C in an oil bath, and reacted for 12 hours at a stirring speed of 500r / min; the resulting solid product was filtered, washed alternately with deionized water and ethanol for 3 rounds, and vacuumed at 80°C Dry for 12 hours to obtain a particle size of 600nm and a specific surface area of 1000m 2 / g, the porosity is 0.15cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 90% mesoporous pores. SEM of nanoscale mesoporous metal organic framework complexes as attached figure 1 shown.
[0052] 2) Preparation of nano-iron nitride-carbon composite catal...
Embodiment 2
[0057] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:
[0058] Take 0.05 mol of ferric nitrate and 0.15 mol of trimesic acid into 200 ml of deionized water at the same time, and add 0.02 mol of ethylene glycol as a surfactant, after magnetic stirring for 1.5 h, ultrasonic treatment for 1 h to obtain a uniformly dispersed precursor solution , placed in a condensing reflux device, heated to 60°C in an oil bath, and reacted for 15 hours at a stirring speed of 600r / min; the resulting solid product was filtered, washed alternately with deionized water and ethanol for 5 rounds, and vacuumed at 100°C Dry for 15 hours to obtain a particle size of 250nm and a specific surface area of 1200m 2 / g, the porosity is 0.13cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 85% mesoporous pores.
[0059] 2) Preparation of nano-iron nitride-carbon composite catalyst:
[0060] Add the mesoporous metal-organic framework complex and dicyandiamide pr...
Embodiment 3
[0064] 1) Preparation of nanoscale mesoporous metal-organic framework complexes:
[0065] Take 0.025 mol of iron acetate and 0.1 mol of trimesic acid and add them to 100 ml of deionized water at the same time, and add 0.03 mol of n-octanoic acid as a surfactant. After 2 hours of magnetic stirring, ultrasonic treatment for 0.5 hours, a uniformly dispersed precursor solution is obtained. Place in a condensing reflux device, heat the oil bath to 80°C, and react for 12 hours at a stirring speed of 700r / min; filter the obtained solid product, wash it alternately with deionized water and ethanol for 4 rounds, and dry it in vacuum at 90°C 12h, the obtained particle size is 220nm, and the specific surface area is 1100m 2 / g, the porosity is 0.4cm 3 / g, nanoscale mesoporous metal-organic framework complexes with 87% mesoporous pores.
[0066] 2) Preparation of nano-iron nitride-carbon composite catalyst:
[0067] Add the mesoporous metal-organic framework complex and dicyandiamide p...
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