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axiang236: 金币+10, 翻译EPI+1 2013-05-25 00:35:52
The difference might be caused by the following reasons: (1) Under the measured acidity (pH 5.0), DA (pKa=8.9) and AA (pKa=4.2) are positively and negatively charged [38], respectively. Thus, the protonated DA could easily permeate and accumulate within the anionic GO layer on the electrode interface, resulting in a large redox response. In contrast, the AA molecules are inhibited to approach the electrode surface by the GO film due to electrostatic repulsion. (2) 。。。。
2楼2013-05-22 08:36:33
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