Lead Modified Nanoporous Platinum Electro-Catalysts for Formic Acid Oxidation

Authors

Yuanyuan Zhang, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
Qingfeng Yi, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;Follow
Gekunkun Zuo, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
Tao Zou, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
Xiaoping Liu, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;
Xiulin Zhou, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, China;

Corresponding Author

Qingfeng Yi(yqfyy2001@hnust.edu.cn )

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 nanoPt/Ti 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.

Graphical Abstract

Keywords

formic acid oxidation, nanoporous Pt, nanoporous Pb-Pt, electrochemical oscillations

DOI Link

https://doi.org/10.13208/j.electrochem.170707

Publication Date

2018-06-28

Online Available Date

2018-01-08

Revised Date

2017-12-26

Received Date

2017-07-07

Recommended Citation

Yuanyuan Zhang, Qingfeng Yi, Gekunkun Zuo, Tao Zou, Xiaoping Liu, Xiulin Zhou. Lead Modified Nanoporous Platinum Electro-Catalysts for Formic Acid Oxidation[J]. Journal of Electrochemistry, 2018 , 24(3): 270-278.
DOI: 10.13208/j.electrochem.170707
Available at: https://jelectrochem.xmu.edu.cn/journal/vol24/iss3/9