سنتز و شناسايي نانو كامپوزيت چارچوب‌هاي فلز -آلي حاوي نقاط كوانتومي پلاتين وكاربرد كاتاليستي آن در پيل‌هاي سوختي متانولي

Synthesis an‎d Characterization of Metal–Organic Frameworks Nanocomposite Containing Platinum Quantum Dots an‎d its Application in Methanolic Fuel Cells

نانو فناوري

Abstract In this research, the discovery of quantum platinum was synthesized an‎d confined in the metal-organic substrate ZIF-8. Then the composite (QDPt@ZIF-8) along with polyvinyl alcohol (PVA) polymer is created on the surface of the glassy carbon electrode. At first, platinum quantum sites from potassium tetrachloroplatinate poly(II) salt were synthesized an‎d identified. Then platinum quantum dots were trapped inside ZIF-8 cavities by in situ synthesis method. The prepared catalyst was determined by scanning electron microscopy (SEM), X-ray analysis, Fourier transform infrared analysis (FT-IR), transmission microscopy (TEM), etc. during the specified preparation steps. Effective parameters during deposition on the glassy carbon electrode surface including platinum concentration, scan speed, methanol an‎d potassium hydroxide concentration an‎d PVA viscosity effect were investigated an‎d the analyzes showed that the optimal values for platinum 1 ml, for methanol an‎d potassium hydroxide 1 M an‎d the optimal scan speed 25 0/V/s an‎d the mass percentage for polyvinyl alcohol is 6.25. Cyclic voltammetry an‎d chronoamperometry electrochemical methods were used to investigate the parameters affecting the electrocatalytic effect of the catalyst (QDPt@ZIF-8-PVA) in methanol oxidation. The electrocatalytic properties of glassy carbon electrode (GCE) free from any chemical compound with glassy carbon electrode coated with polyvinylalcohol, ZIF-8 an‎d QDPt@ZIF-8-PVA were studied for the electrochemical oxidation of methanol using cyclic voltammetry method, an‎d The obtained results indicated that the QDPt@ZIF-8-PVA composite showed better electrocatalytic activity compared to other modes.

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