In:
ECS Meeting Abstracts, The Electrochemical Society, Vol. MA2018-01, No. 30 ( 2018-04-13), p. 1736-1736
Abstract:
Hydroxide membrane fuel cells (HEMFCs) operated in alkaline media enables the use of the non-noble catalyst for oxygen reduction reaction (ORR). Therefore, it seems promising that HEM technology can replace the Pt-metal dependent proton exchange membrane (PEM) technology. However, the sluggish hydrogen oxidation reactions (HORs) on Pt-metal catalysts in the alkaline electrolyte, which are up to two orders of magnitude slower than in the acid electrolyte, requires a higher loading of precious metals on the anode of HEMFCs. This, to a larger extent, offsets the cost gains from employing non-precious metal on the cathode of HEMFCs. In order to tackle this challenge, we prepared Pd 50 Cu 50 alloy nanoparticles (NPs) and characterized them for HOR in 0.1 M potassium hydroxide. The HOR activity exhibited a strong dependence on the annealing temperature. In particular, Pd 50 Cu 50 alloy NPs annealed at intermediate temperature outperforms Pt and Pd. The conventional lab-based XRD shows the annealed Pd 50 Cu 50 alloy features a special crystalline phase. And the synchrotron sources based x-ray further revealed the time-resolved phase change of Pd 50 Cu 50 alloy as the temperature was ramped from 30°C to 950°C. Analysis of STEM and XPS, along with the theoretical modeling based on density functional theory (DFT), provides a new insight into the correlation between the crystalline structure of Pd 50 Cu 50 alloy with HOR activity in alkaline media.
Type of Medium:
Online Resource
ISSN:
2151-2043
DOI:
10.1149/MA2018-01/30/1736
Language:
Unknown
Publisher:
The Electrochemical Society
Publication Date:
2018
detail.hit.zdb_id:
2438749-6
