Development and Application of printing ink of Lead-Ruthenium Oxide Pyrochlore

• Main Authors: Xin-Zhi Wang, 王信智
• Other Authors: Jyh-Myng Zen
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/pxbbgz

碩士 === 國立中興大學 === 化學系所 === 107 === Metal oxides is popular choice of research in fuel cells, such as lead and ruthenium. Bare ruthenium electrode come with good electrocatalytic activity, but its high-cost. Lead is usually used for battery electrode materials because of its low-cost. Therefore, by mixing small amount of ruthenium with lead, it is possible to increase electrocatalytic activity and reduce cost. In this work, lead-ruthenium oxide pyrochlore was combined with screen printing carbon electrodes (SPCE) and study application of modified electrode. We’ve divide synthesis method of lead-ruthenium oxide pyrochlore into four directions. First, Nafion which be modified to the surface of SPCE by spin-coating, then Pb2+ and Ru3+ exchange into the Nafion film and was submersed in KOH solution, called chemical modification; The modified electrode was called Npy-SPCE. Second, after the Pb2+ solution and Ru3+ solution were mixed with Nafion, ion exchange was carried out by standing or shaking, and then KOH solution was added for precipitation. The catalyst solution was modified to the surface of SPCE by drop coating. Thirt, after mixing Pb2+ solution with Ru3+ solution and KOH was added to the solution so as to maintain a pH 13; precipitation of the hydroxides was carried out at 75 ℃ under constant stirring and purging of the solution with oxygen gas for 24 hour. The product was filtered, washed, and dry at 130 ℃ for 2 hour. It was mixed with carbon ink and printed on the surface of SPCE, was called py-SPCE. In the first chapter, lead-ruthenium oxide pyrochlore was not completely formed in the Nafion film, resulting in Pb2+ and Ru3+ exchange out the Nafion film. Therefore, Pb2+ and Ru3+ concentration decrease as submersed time increase, resulting in ion-exchange ability of Nafion film was reproduced. With K3Fe(CN)6 as the probe, it is observed that the signal decay. In the second chapter, lead-ruthenium oxide pyrochlore is not fully produced in Nafion film, resulting in K3Fe(CN)6 couldn’t be detected. It is presumed that the conditions of oxidation were not optimal. In the thirt chapter, we find the better stable than oother method of synthesis, which is co-precipitation in aqueous solution. The stability is batter than other modified electrode. Lead-ruthenium oxide pyrochlore also has catalytic activity for OER. In the fourth chapter, we study the catalytic activity of py-SPCE for OER (Oxygen evolution reaction), comparing the catalytic activity of py-SPCE with platinum, and study feasibility and future applicability of production of oxygen for py-SPCE.