What is it about?
The state of the art anode catalysts for HOR is Pt which is rare and expensive metal. Operation of fuel cells in alkaline electrolyte opens opportunity to replace Pt with other materials. In this paper we report active and durable catalyst for HOR based on NiMo material. For the first time, operando X-ray computed tomography (CT) experiments were performed demonstrating liquid water formation at the PGM-free anode during cell operation, and in situ near ambient pressure X-ray photoelectron spectroscopy (NAPXPS) and X-ray absorption spectroscopy (NAPXAS) were used to study the role of molybdenum in hydrogen adsorption.
Featured Image
Why is it important?
Introducing PGM-free anode catalysts would complete the material set for the anion exchange fuel cell and would reveal its full economic potential as the first material unlimited low-temperature FC technology entirely based on an earth-abundant element base.
Perspectives
From the perspective of surface chemist, the surface chemistry of newly synthesized materials is of critical importance for targeted material synthesis approaches. XPS has shown to be useful not only in providing chemical structural information of the catalyst itself but also allowed post-test analysis of electrodes explaining the changes in structure occurring during hydrogen oxidation reaction. The power of probing the chemistry of the surface in the presence of reacting gas is critical in understanding the role of alloying metal in the nickel-based compounds.
Dr Kateryna Artyushkova
Physical Electronics
Read the Original
This page is a summary of: Platinum group metal-free NiMo hydrogen oxidation catalysts: high performance and durability in alkaline exchange membrane fuel cells, Journal of Materials Chemistry A, January 2017, Royal Society of Chemistry,
DOI: 10.1039/c7ta08718g.
You can read the full text:
Contributors
The following have contributed to this page
