How Does Metal Hydride Formation Occur?

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Discussion Overview

The discussion centers around the formation of metal hydrides, specifically exploring the mechanisms involved in hydrogen dissociation and absorption on metal surfaces. Participants are examining theoretical models and experimental observations related to this process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant expresses confusion about the process of metal hydride formation and questions why molecular hydrogen dissociates at the surface before absorption, noting a specific observation regarding desorption.
  • Another participant references a theory of autocatalytic dissociation of hydrogen in metals and provides links to relevant academic articles that discuss hydrogen dissociation on metal surfaces and the diffusion of protons through metallic structures.
  • It is mentioned that the solubility of hydrogen in metals is temperature dependent, suggesting a variable factor in the formation of hydrides.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are multiple viewpoints regarding the mechanisms of metal hydride formation and the factors influencing it. The discussion remains unresolved with ongoing questions and references to theoretical models.

Contextual Notes

The discussion highlights limitations in understanding the specific mechanisms of hydrogen dissociation and absorption, as well as the dependence on temperature and other conditions that may not have been fully explored or defined.

mess1n
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I'm very confused about how metal hydrides form. I'm looking at PCI plots and I see what's happening, but I have no idea why it is. For instance:

"Molecular hydrogen is dissociated at the surface before absorption; two H atoms recombine to H2 in the desorption process."

Why does this happen?

PCI Plot.gif


Also, I've attached a PCI plot. Can anyone explain why the concentration suddenly increases at certain pressures?

I've searched so many books and internet resources to try and find an explanation for these processes, to no avail, please help! :(


Andrew
 
Last edited:
Engineering news on Phys.org
Sorry to bump this, but I'm hoping someone sees it who will be able to help. Is this question in the right section?
 
There is a theory of autocatalytic dissociation of hydrogen in metals.
http://www.springerlink.com/content/f602850hk808h357/

And there is this
Hydrogen dissociation on metal surfaces – a model system for reactions on surfaces
Applied Physics A: Materials Science & Processing
Volume 67, Number 6, 627-635, DOI: 10.1007/s003390050834
A. Gross

Clearly to form hydrides, the proton has to diffuse through the metallic grains/crystal structure. The solubility of hydrogen in a metal is temperature dependent.
 
Thanks so much for the reply, I'll read through those articles now.
 

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