Platinum dissolution and deposition in the polymer electrolyte membrane of a PEM fuel cell as studied by potential cycling.
The behavior of platinum dissolution and deposition in the polymer electrolyte membrane of a membrane-electrode-assembly (MEA) for a proton-exchange membrane fuel cell (PEMFC) was studied using potential cycling experiment and high-resolution transmission electron microscopy (HRTEM). The electrochemically active surface area decreased depending on the cycle number and the upper potential limit. Platinum deposition was observed in the polymer electrolyte membrane near a cathode catalyst layer. Platinum deposition was accelerated by the presence of hydrogen transported through the membrane from an anode compartment. Platinum was transported across the membrane and deposited on the anode layer in the absence of hydrogen in the anode compartment. This deposition was also affected by the presence of oxygen in the cathode compartment.
Research Institute for Ubiquitous Energy Devices, National Institute of Advanced Industrial Science and Technology, Ikeda, Osaka 563-8577, Japan.
Kazuaki
K
Yasuda
Akira
A
Taniguchi
Tomoki
T
Akita
Tsutomu
T
Ioroi
Zyun
Z
Siroma
D055598:Chemical Phenomena; D002627:Chemistry, Physical; D011211:Electric Power Supplies; D004573:Electrolytes / Q000737:chemistry*; D006859:Hydrogen / Q000737:chemistry; D008567:Membranes, Artificial; D046529:Microscopy, Electron, Transmission / Q000295:instrumentation / Q000379:methods; D010100:Oxygen / Q000737:chemistry; D010316:Particle Size; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013499:Surface Properties
D004573:Electrolytes; D008567:Membranes, Artificial; D011108:Polymers; D010984:Platinum; D006859:Hydrogen; D010100:Oxygen