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Gold/Mining/Energy : ZEN vs CCB -- Ignore unavailable to you. Want to Upgrade?

To: Glorieux who wrote (464)	8/15/2015 11:32:17 PM
From: Glorieux	1 Recommendation Recommended By panamax Respond to of 5988

The highlights of that paper are figure 7 showing natural graphite losing it's complete mass was at 860 degrees, same as reported by Ballard. On the same graph, you can see synthetic graphite having complete mass loss at 900 degrees. For ZEN to still have 35-40% of it's mass at 1000 degrees shows the ZEN graphite is truly different from flake or synthetic and in this one important aspect seems to have no equal. On page 16, they go on to explain that the natural graphite had structural defects (rhombohedral crystalline phase as evidenced by XRD) which made them more susceptible to oxidation. So when ZEN keeps repeating that we have highly crystalline graphite, this is one of the attributes of that. From the paper again: These observation are consistent with reports in literature that air oxidation of cabonaceous materials depend on parameters such as crystal structure and surface area. Again, purity is the starting point. How crystalline the structure is (ZEN is highly crystalline) will dictate how it will perform. Does this help stuffbug? Glorieux

To: Glorieux who wrote (464)	8/15/2015 11:58:06 PM
From: stuffbug	Read Replies (1) \| Respond to of 5988

Glorieux, thanks for the technical information. It is appreciated. There is much more to graphite than purity Agreed. As I recently posted on another board, Asbury Carbons markets a variety of high performance natural and synthetic graphites for use in bi-polar fuel cell plates with varying characteristics: - particle size from 8 microns to over 40 microns, - resistivity from 0.03 ohm cm to 0.07 ohm cm and - purity generally in the range 99.4 - 99.9% Cg Asbury Carbons also noted that researchers differ widely in opinion regarding the best graphite “type” and particle size distribution for PEM fuel cells. However, most would agree that graphite materials should be at least 99% pure. Also of note, typical plates are compound mixtures, containing about 90% graphite, with binder materials accounting for the other 10%. So, even if you have the "best fuel cell graphite", the performance of the fuel cell also depends on the ability of the manufacturer to select the appropriate binder matrix formula.