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标题:Oxygen reduction mechanism on corroded zinc 摘要:The mechanism of oxygen reduction on the as-polished and corroded zinc specimens has been studied using a rotating ring disc electrode (RRDE) system. On the as-polished surface, oxygen was reduced into two distinct steps. In the first step, about 44% of O2 was reduced to H2O2 in a 2-electron reaction with the rest being reduced to OH in a 4-electron reaction. On the other hand, in the second step, with the increase of overpotential O2 was almost exclusively reduced to OH in a 4-electron reaction. The first step reduction occurred on an air-formed oxide-covered surface at more positive potential than 1.2 V vs. Ag/AgCl and the second step reduction (E < 1.2 V) took place on a semi-uniformly active surface. On the corroded surface, the second step was not distinctly observed on the polarization curve, because reduction of the zinc corrosion products simultaneously took place around 1.2 V. The O2 reduction in the first step was inhibited by deposition of the corrosion products, though the ratio of amount of O2 reduced to OH in a 4-electron reaction was larger than that on the as-polished surface. The mechanism of oxygen reduction is discussed on the basis of results obtained from the RRDE experiment. |
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爱与雨下(金币+1): ~! 2011-10-09 12:04:53
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标题:锌腐蚀氧化还原机理 摘要:对于抛光和腐蚀锌标本的氧化还原机理,我们使用旋转环盘电极(RRDE)系统对其进行了研究。在抛光的表面,氧气还原分为两个不同的步骤。在第一步中,约44%的O2被还原成H2O2在一个2-电子的反应中,而剩余的氧则被还原成 OH 在一个4电子的反应中。另一方面,在第二步当中,随着氧气点位的增高,几乎所有的氧在一个4电子的反应中被还原成为OH。第一步还原反应在锌周围空气形成一个氧气覆盖面与在(1.2 V与银/氯化银)的情况下相比反应更为完全,而第二步的还原反应(E <1.2 V),则发生在一个半均匀活跃的表面。在锈蚀的表面,第二步是不易在 极化曲线上观察到的,因为锌腐蚀产物的还原同时也发生在大约1.2 V左右。而第一步中的氧化还原受到了腐蚀产物沉积的抑制,虽然这时氧气在4电子反应直播中被还原成OH的比例大于抛光表面的氧气被还原的比例。氧还原反应的机制的讨论是在RRDE实验得到的结果的基础展开的。 |
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