用交替微波法制备纳米PVC催化剂,研究和比较葡萄糖在光亮Pt和纳米Pt/C电极上的氧化行为.实验表明,Pt纳米化后,电极反应过电位降低,动力学速率相应提高,从而使电化学性能得到改善.其催化活性和抗毒化能力大于光亮Pt的可能原因即在Pt纳米化后,大幅度提高了表面积,结果不仅增加其电极活性,而且含氧物也容易接近受毒化的反应点,从而较易氧化毒化物而使电极再次活化.
Nano Pt/C electrocatalysts were prepared by intermittent microwave heating method.The electrooxidation of glucose on smooth Pt and～Pt/C electrodes has been studied and compared.The results showed that the electrochemical properties on nano Pt/C were improved due to the reduction of the overpotential and the increase in the kinetic rate.The surface area would be significantly increased when the particle size of the catalyst was reduced to nano-scale,resulting in the increase in the activity.The enhancement in the resistance to poisoning could be explained that the oxygen-containing species are easier to react with poisoning species on nano Pt/C and re-active the electrode.
[1]Shen P K,Tseung A C C.Anod ic oxidation of m ethanolon Pt/WO3in ac id ic m ed ia[J].J.E lectrochem.Soc.,1994,141:3082~3089.
[2]Shen P K,Chen K Y,Tseung A C C.Perform ance of co-deposited Pt-Ru/WO3electrodes for the electrooxidalionof form ic ac id at room temperature[J].J.E lectroanal.Chem.,1995,389,219~223.
[3]Zhang X,Chan K Y,Tseung A C C.E lectrochem ical oxi-dation of glucose by electrode[J].J.E lectroanal.Chem.1995,386;241~243.
[4]Zhang X,Chan K Y,You J K,et al.Partial oxidation ofglucose by a PVW 03 electrode[J].J.E lectroanal.Chem.,1997,430:147~153.
[5]Shen P K,Tian Z Q.Perform ance of h ighly d ispersedPVC catalysts for low temperature fuel cells[J].E lectro-ch im.Acta,2004,49:3107~3111.
[6]Xu C W,Shen P K,Novel Pt/CeO2/C catalysts for elec-trcoxidadon of alcohols in alkaline m ed ia[J].Chem.Commun.,2004,2238~2239.
[7]W e i X L,Shen P K.Anod ic oxidation of glucose onp latinum in alkaline m ed ia[J].Ch in.J.Chem.Phys.,2003,16:395~400.
[8]Krausa M,V ielstich W.Potential osc illations duringm ethanol oxidation at Pt-electrodes Part 1:Experim entalcond itions[J].J.E lectroanal.Chem.,1995,399:7~12.
[9]Lee J,E ickes C,E isw irth M,et al.E lectrochem ical os-c illations in the m ethanol oxidation on Pt[J].E lectrim i-ca Acta,2002,47:2297~2301.
