Power and Efficiency Advancements for Low Rate - Long Endurance Semi-Fuel-Cells
Abstract
The characterization and use of a palladium and iridium catalyst combination on several cathode substrates (carbon paper, porous nickel, titanium dioxide, carbon fibers) are described The Pd/Ir combination outperforms palladium alone or iridium alone on all of the substrates as determined by catalyst deposit stability, polarization curve Tafel slope and onset potential. Scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and transmission electron microscopy (mM) were used to establish the composition and structure of palladium and iridium clusters on the cathode substrate surfaces. Cyclic voltammetry was employed as the method of choice for deposition; however, constant potential deposition was also investigated. Several deposition parameters were investigated including deposition range, scan rate, and number of cycles. This report describes the optimum deposition conditions and the best catalyzed substrate as tested in a metal-hydrogen peroxide semi-fuel cell.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 30, 2002
- Accession Number
- ADA406734
Entities
People
- Russell R. Bessette
Organizations
- University of Massachusetts