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| 0:00:18 | hello i want to thank you for taking the time to look at this video |
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| 0:00:21 | on the physical chemistry toward proton exchange membrane fuel cell advance |
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| 0:00:27 | i presenting in about half of myself karen's wider lines and my co author stephen |
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| 0:00:32 | campbell |
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| 0:00:33 | i work at the naval research laboratory in washington d c |
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| 0:00:37 | and stephen works for the automotive fuel cell collaborative corporation or a f c and |
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| 0:00:42 | barnaby canada |
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| 0:00:44 | reaction fuel cells a simple |
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| 0:00:47 | hydrogen and oxygen are combined electro chemically to make water and eight |
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| 0:00:52 | the hydrogen is a exercise bike at a list of the in a to me |
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| 0:00:56 | protons and electrons the protons passed through proton exchange membrane all the electrons provide power |
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| 0:01:02 | to a low |
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| 0:01:03 | and their recombine on a caff the catalyst |
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| 0:01:06 | with oxygen to make water |
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| 0:01:09 | fuel cells are now being used in everything from automobiles |
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| 0:01:13 | two unmanned air vehicles |
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| 0:01:16 | i'm holding in my hand at three hundred watt fuel cells to what i would |
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| 0:01:21 | like to see is the stacked be much smaller and less expensive and use hydrogen |
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| 0:01:25 | fuel more efficiently |
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| 0:01:26 | from our perspective the path to the next generation cost effective fuel cells lies in |
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| 0:01:32 | making more efficient higher power systems |
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| 0:01:34 | in this path must be forged physical chemistry |
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| 0:01:39 | the most important thing to do is improve the catalyst activity and then create an |
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| 0:01:43 | electrode structure they can take advantage of that higher activity |
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| 0:01:48 | this electron microscopy picture shows the standard fuel cell catalyst a banana scale platinum clusters |
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| 0:01:54 | a porous carbon |
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| 0:01:57 | a lot of theory has been done on just the platinum alone how duck analyses |
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| 0:02:01 | the production of oxygen to water |
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| 0:02:04 | theory has been used successfully to understand and project alternatives |
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| 0:02:09 | platinum alloys to non platinum catalyst |
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| 0:02:12 | here's a molecular dynamics representation of the cathode catalyst layer |
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| 0:02:18 | the platinum catalyst in purple is on a carbon support |
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| 0:02:21 | and then surrounded by an a few known i a number which conducts protons and |
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| 0:02:26 | the sitting in the middle of water |
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| 0:02:27 | oxygen and nitrogen gas as |
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| 0:02:30 | you can see that a real catalyst layers very complicated and much work needs to |
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| 0:02:35 | be done to understand and improve this complicated three dimensional multi phase structure |
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| 0:02:41 | this is one the catalyst coded membranes a goes in the fuel cell their challenges |
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| 0:02:46 | we characterize in the catalyst consistently both in terms of it selector chemical properties and |
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| 0:02:51 | how it occupies the catalyst later in the fuel cell |
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| 0:02:54 | with new high performance catalyst we need to rethink a lot of the fuel cell |
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| 0:02:58 | even down to the details of the inter facial resistance between the materials |
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| 0:03:04 | there are many opportunities for thing at scandalous theory in characterisation tools |
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| 0:03:10 | we're excited the fuel cells are being demonstrated in many applications today and look forward |
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| 0:03:15 | to many more advances in physical chemistry which will lead to smaller cheaper and more |
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| 0:03:20 | efficient fuel cells have been widely used in the push for free energy thanks for |
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| 0:03:25 | watching this video hope that you enjoy the p |
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