Abstract
Core nanoparticles of Pd, Pd-Ru, and Pd supported on an amorphous carbon are deposited, by a flame-based process, onto glassy carbon rotating disk electrodes and gas diffusion layers. A Pt monolayer was deposited using galvanic displacement of an underpotentially deposited Cu monolayer with Pt. The Pt monolayer is then tested to determine the electrochemical surface area and activity toward the oxygen reduction reaction. Depositions of the Pd core were applied at substrate temperatures of 250 °C and 150 °C. A Pt ML/Pd(250 °C) has higher Pt mass and specific ORR activities than PtML/Pd(150 °C). This is due to smoother surface of Pd (250 °C) compared to Pd (150 °C). During membrane electrode assembly testing in O2, the Pt mass activity was 0.532 A/mgPt at 0.9 V. The voltage at 1 A/cm2 was 0.613 V, and a peak power density of 0.93 W/cm2 was achieved.
| Original language | English |
|---|---|
| Pages (from-to) | 341-352 |
| Number of pages | 12 |
| Journal | Electrochimica Acta |
| Volume | 138 |
| DOIs | |
| State | Published - Aug 20 2014 |
| Externally published | Yes |
Funding
The authors wish to acknowledge the University of Connecticut School of Engineering for partial funding of this work and the NSF CMMI grant #1265893 for funding of the RSDT processing part of the research. Sandia is a multiprogram laboratory operated by Sandia Corporation, a Lockheed Martin Company, for the United States Department of Energy under contract DE-AC04-94AL85000. Work at Brookhaven National Laboratory is supported by the US Department of Energy, Division of Chemical Sciences, Geosciences, and Biosciences Division, under the Contract No. DE-AC02-98CH10886.
Keywords
- Core-shell
- Flame processing
- Flame synthesis
- Fuel cell
- Oxygen reduction