Pt dissolution study in dilute acidic solution for electrochemical power generation system

2015 Fiscal Year Final Research Report

• Project/Area Number: 26550060
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Environmental engineering and reduction of environmental burden
• Research Institution: Nagaoka University of Technology
• Principal Investigator: Umeda Minoru 長岡技術科学大学, 工学(系)研究科(研究院), 教授 (20323066)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: 環境負荷低減 / クローズド化

Outline of Final Research Achievements

Electrochemical Pt dissolution was found to be accelerated by the presence of H2O2 in a 0.5 M H2SO4 solution. A faster Pt dissolution was examined by adding a small amount of metal ion, resulted in a combination of H2O2 and Fe2+ showed the fastest dissolution. This Pt dissolution was investigated using an electrochemical quartz crystal microbalance (EQCM). The EQCM data in the H2O2-containing H2SO4 with and without Fe2+ showed that a remarkable Pt dissolution occurred during the cathodic potential step of 1.36 / 0.36 V vs. RHE from the 4th cycle, which is further enhanced by the presence of Fe2+. The mass gains and mass losses observed up to the 3rd cycle were also more significant in the presence of Fe2+, suggesting that the roughness of the Pt electrode surface remarkably increased. This phenomenon may be caused by the enhanced O2 generation due to the significant decomposition of H2O2. As a result, Pt oxidants inducing the cathodic Pt dissolution occur from the rearranged Pt atoms.

Free Research Field

環境学