电化学2018，Vol.24Issue(3)：270-278,9.DOI:10.13208/j.electrochem.170707
铅修饰纳米多孔铂催化剂对甲酸氧化的电活性
Lead Modified Nanoporous Platinum Electro-Catalysts for Formic Acid Oxidation
摘要
Abstract
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 (nanoPt/Ti) electrode was prepared using a hydrothermal method.The as-prepared nanoPt/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 (nanoPb(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 nanoPt/Ti and nanoPb(n)-Pt/Ti electrodes displayed high electrocatalytic activities for formic acid oxidation,and the onset potential of formic acid oxidation on the nanoPb(20)-Pt/Ti electrode was-0.06 V,which was more negative than that on the nanoPVTi electrode (0.06 V).In addition,the first oxidation peak current density on the nanoPb(20)-Pt/Ti electrode was 12.7 mA-cm-2,which was far larger than that on the nanoPt electrode (4.4 mA· cm-2).Chronoamperommetric data at 0.1 V in 0.5 mol· L-1 H2SO4 + 1 mol· L-1 HCOOH suggested that the nanoPb(20)-Pt/Ti electrode exhibited the stable current density of 8.09 mA ·cm-2 which was 60 times higher than the nanoPt electrode,indicating the dramatic enhancement of electroactivity on the lead-modified nanoPt/Ti electrode for formic acid oxidation with comparison to the nanoPt/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 H2SO4 + 1 mol· L-1 HCOOH revealed notable electrochemical oscillations which lasted longer time than those on the nanoPt/Ti electrode.It was demonstrated that the lead-modified nanoPb(20)-Pt/Ti electrode presented the most significant enhancement on surface anti-poisoning ability.关键词
甲酸氧化/纳米多孔Pt,纳米多孔Pb-Pt/电化学震荡Key words
formic acid oxidation/nanoporous Pt/nanoporous Pb-Pt/electrochemical oscillations分类
化学化工引用本文复制引用
张媛媛,易清风,左葛琨琨,邹涛,刘小平,周秀林..铅修饰纳米多孔铂催化剂对甲酸氧化的电活性[J].电化学,2018,24(3):270-278,9.基金项目
This work was supported by the National Natural Science Foundation of China (No.21376070). （No.21376070）
