Patent ID: 11870081
Assignee: nan
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  Y | IPC B  H

Claim 0:
1. A method for preparing a catalyst based on platinum (Pt) dispersed on a carrier containing graphene quantum dots, the method comprising the following steps:
step 1: prepare a carrier containing graphene quantum dots:
reacting a carbon fiber, which was ground to powder (carbon fiber powder) react with a mixture of HNO3 70% and H2SO4 98%, with a mass ratio of carbon fiber powder to a volume of HNO3 70% and H2SO4 98% in the range 1:20:30 to 1:60:90, under transducer ultrasound reaction, with a capacity of 750 W and then proceeding to a reflux reaction, allowing the mixture to cool down to room temperature, neutralizing the mixture to pH=7 with NaOH solution in cold ice, then handle neutralizing solution in either of the following two ways:
a.1. adding the neutralizing mixture to the dialysis membrane 1000 Da, conducting dialysis with deionized water to obtain a liquid containing graphene quantum dots (GQDs) in the dialysis membrane to use as a carrier or
a.2. crystalizing salts present in the neutralizing mixture, filtering and removing the crystalized crystals from the filtrate to obtain a filtrate containing a mixture of graphene oxide and graphene quantum dot (GO-GQDs) to use as a carrier;
step 2: prepare catalyst based on Pt dispersed on graphene quantum dots:
adding a solution containing a Pt precursor to the liquid obtained in step 1 (a.1) or to the filtrate obtained in step 1 (a.2) then carrying out the ultrasonic reaction, after that proceeding with Pt ion reduction with NaBH4 0.15 M solution at the temperature ranging from about 25° C. to 80° C., next recover and purify solid products by centrifugation and washing by centrifugation several times with demineralized water, drying in vacuum to obtain the catalyst comprising Pt dispersed on graphene quantum dots and the catalyst based on Pt dispersed on a carrier containing a mixture of graphene oxide and graphene quantum dots, useful as anode catalyst for DAFC.