Influence of aminosilane surface functionalization of rare earth hydride-forming alloys on palladium treatment by electroless deposition and hydrogen sorption kinetics of composite materials

A combination of analytic tools and electrochemical testing was employed to study the contributions of Palladium (Pd) in a Zr-based AB2 metal hydride alloy (Ti12Zr22.8V10 Cr7.5Mn8.1Co7Ni32.2Al0.4). Pd enters the A-site of both the C14 and C15 Laves phases and shrinks the unit cell volumes, which results in a decrease of both gaseous phase and electrochemical hydrogen storage capacities. On the other hand, the addition of Pd benefits both the bulk transport of hydrogen and the surface electrochemical reaction. Improvements in high-rate dischargeability and low-temperature performances are solely due to an increase in surface catalytic ability. Addition of Pd also decreases the surface reactive area, but such properties can be mediated through incorporation of additional modifications with rare earth elements. A review of Pd-addition to other hydrogen storage materials is also included.

https://www.mdpi.com/2313-0105/3/3/26/pdf

Increase in the Surface Catalytic Ability by Addition of Palladium in C14 Metal Hydride Alloy

Synergetic catalyst effect of Ni/Pd dual metal coating accelerating hydrogen storage properties of ZrCo alloy

Surface engineering approaches were adopted in the preparation of advanced materials based on “low-temperature” AB5 hydride-forming intermetallide. The approaches used included micro-encapsulation with palladium, as well as with palladium-containing mixed coatings. The influence of these modifications on surface morphology and hydro-genation characteristics of the material were investigated. It was found that palladium-nickel encapsulation improves the hydrogenation kinetics of the intermetallide in the absorption of hydrogen at low pressure and room temperature, and after long-term pre-exposure to air. The developed surface-modified materials may potentially find their application in highly-selective hydrogen extraction and purification processes

Q. Li

Papers

Surface-modified ab5 alloys with enhanced hydrogen absorption kinetics