24752
To explain why these barriers are so small , we analyze the charge density and the density of states plots to see that first , the electron transfer is decoupled from the proton transfer so that in the initial state , the surface and adsorbate are already charged up and can easily accept the proton from solution .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
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