Preparation method of Ni-loaded hollow carbon microsphere NaBH4 electro-oxidation catalyst

Abstract

The invention provides a preparation method of a Ni-loaded hollow carbon microsphere NaBH4 electro-oxidation catalyst. The method comprises the steps of (1) mixing styrene and divinylbenzene with deionized water, introducing N2 into the mixed solution, feeding CC14, and maintaining the temperature of 60 DEG C; after that, feeding K2S2O8 and NaCl, stirring, gradually heating up to 70 DEG C, and carrying out reaction for 10-12 hours to obtain an emulsion; cleaning by alcohol and centrifuging; carrying out vacuum drying for 8-10 hours at the temperature of 50 DEG C to obtain polystyrene microspheres; (2) putting the obtained polystyrene microspheres into dichloromethane, swelling for 30 minutes, feeding concentrated sulfuric acid, and carrying out reaction for 2-4 hours at the temperature of 80-90 DEG C; adjusting the pH value to be 10-12, and drying for 5-6 hours at the temperature of 50 DEG C to obtain sodium polystyrenesulfonate cation exchange resin microspheres; (3) soaking the obtained sodium polystyrenesulfonate cation exchange resin microspheres into NiCl solution for 8-10 hours, then taking out the product, and drying for 4-5 hours at the temperature of 50 DEG C to obtain Ni-loaded cation exchange resin microspheres; and (4) calcining the Ni-loaded cation exchange resin microspheres for 5-6 hours under the nitrogen atmosphere at the temperature of 650-750 DEG C to obtain the Ni-loaded hollow carbon microsphere catalyst. After the method is adopted, the electro-oxidation performance and the utilization rate of the NaBH4 can be greatly improved.

Description

technical field [0001] The present invention relates to a kind of NaBH 4 Preparation method of electro-oxidation catalyst. Background technique [0002] Direct borohydride fuel cell is a new type of direct liquid fuel cell using borohydride as anode fuel. Borohydrides with high hydrogen content (NaBH 4 , 11wt.%), the oxidation kinetics is fast, and the energy density is high (the specific energy is 9300Wh·kg -1 , 2850Wh·L -1 ); specific capacity up to 5668Ah kg -1 ; Borohydride is not flammable and has low toxicity. In addition, borohydride is solid, which is convenient for storage and transportation; the most important thing is that no CO is generated during the electro-oxidation process of borohydride, so there is no catalyst poisoning phenomenon. The above outstanding advantages make direct borohydride fuel cells promising to become a new generation of space power, underwater power and portable power with high energy and high power density. [0003] In theory, the c...

AI Technical Summary

Problems solved by technology

[0009] Therefore, in the actual process, the electrode potential of the anode is a mixed potential between formulas (1) and (3); if the hydrolysis of formula (2) releases too much hydrogen, it is too late for the electrooxidation reaction of formula (3) to occur, and the hydrogen will The release of hydrogen in the form of hydrogen makes the oxidation of borohydride incomplete, and the number of electrons released is less than 8. The hydrogen produced at the same time will increase the difficulty of battery design