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《Journal of Electrochemistry》 2018-03
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Lead Modified Nanoporous Platinum Electro-Catalysts for Formic Acid Oxidation

Yuanyuan Zhang;Qingfeng Yi;Gekunkun Zuo;Tao Zou;Xiaoping Liu;Xiulin Zhou;School of Chemistry and Chemical Engineering, Hunan University of Science and Technology;  
Platinum(Pt)catalysts modified by other suitable metals significantly enhance their electrochemical activities for formic acid oxidation.In this work,a titanium-supported nanoporous network platinum(nano Pt/Ti)electrode was prepared using a hydrothermal method.The as-prepared nano Pt/Ti electrode was modified with a certain amount of lead by using cyclic voltammetry for different scan cycle numbers(n),namely,n=10,15,20 and 30,to synthesize the novel lead-modified nanoporous Pt(nano Pb_((n))-Pt/Ti)electrodes.Electro-oxidation of formic acid on these electrodes was studied with cyclic voltammetry(CV),chronoamperometry and chronopotentiometry in sulfuric acid solution.CV curves showed that both nano Pt/Ti and nano Pb_((n))-Pt/Ti electrodes displayed high electrocatalytic activities for formic acid oxidation,and the onset potential of formic acid oxidation on the nano Pb_((20))-Pt/Ti electrode was-0.06 V,which was more negative than that on the nano Pt/Ti electrode(0.06 V).In addition,the first oxidation peak current density on the nano Pb_((20))-Pt/Ti electrode was 12.7 mA·cm~(-2),which was far larger than that on the nano Pt electrode(4.4 mA·cm~(-2)).Chronoamperommetric data at 0.1 V in 0.5 mol·L~(-1 )H_2SO_4+1 mol·L~(-1 )HCOOH suggested that the nano Pb_((20))-Pt/Ti electrode exhibited the stable current density of 8.09 mA·cm~(-2 )which was 60 times higher than the nano Pt electrode,indicating the dramatic enhancement of electroactivity on the lead-modified nano Pt/Ti electrode for formic acid oxidation with comparison to the nano Pt/Ti electrode.Chronopotentiometric responses on the electrode at 1.5 mA,2 mA,2.2 mA and 2.5 mA in 0.5 mol·L~(-1 )H_2SO_4+1 mol·L~(-1)HCOOH revealed notable electrochemical oscillations which lasted longer time than those on the nano Pt/Ti electrode.It was demonstrated that the lead-modified nano Pb_((20))-Pt/Ti electrode presented the most significant enhancement on surface anti-poisoning ability.
【Fund】: supported by the National Natural Science Foundation of China (No. 21376070)
【CateGory Index】: O643.36;TM911.4
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