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zxg23

银虫 (小有名气)

[求助] 氧气还原反应电子数的确定

请问测定修饰电极催化氧还原反应有哪些方法哪,我刚接触电化学,只知道rde和rrde可以,但是我们只有一台电化学工作站,想文下,只用电化学工作站可以测定氧还原的电子数吗,还有,用rde和rrde测参与电子数的公式我也是不熟悉,请问能不能帮我解决下,非常非常的感谢!
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jiazhijunwin

铁杆木虫 (正式写手)

【答案】应助回帖

zxg23(金币+10): 2011-11-12 11:41:08
通过电化学工作站能够确定氧化还原反应的电子数的。利用极化曲线就能够计算。
3楼2011-11-11 09:19:01
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fengxian0222

金虫 (初入文坛)

【答案】应助回帖

zxg23(金币+10): 2011-11-12 11:41:00
参考文献:
Liu, R. L.; Wu, D. Q.; Feng, X. L.; Mullen, K., Nitrogen-Doped Ordered Mesoporous Graphitic Arrays with High Electrocatalytic Activity for Oxygen Reduction. Angew. Chem. Int. Ed. 2010, 49, 2565-2569.
Wang, S.; Yu, D.; Dai, L., Polyelectrolyte Functionalized Carbon Nanotubes as Efficient Metal-free Electrocatalysts for Oxygen Reduction. J. Am. Chem. Soc. 2011, 133, 5182-5185.
The transferred electron number per oxygen molecule involved in the oxygen reduction at N-doped graphene electrode was determined by the Koutechy-Levich (K-L) equation given below:
1/J=1/J_K +1/(Bω^(1/2) )
where JK is the kinetic-limiting current densities, and ω is the electrode rotating rate. B could be determined from the slope of K-L plots based on K-L equation as follows:
B=0.2nFC0 (D0)^(2/3) (ν)^(-1/6)
where n represents the transferred electron number per oxygen molecule, F is the Faraday constant (F = 96485 C mol-1), C0 is the bulk concentration of O2 (1.2×10-6 mol cm-3), D0 is the diffusion coefficient of O2 in 0.1 M KOH (1.9×10-5 cm2 s-1), and υ is the kinetic viscosity (0.01 cm2 s-1). The constant 0.2 is adopted when the rotation speed is expressed in rpm.
天涯明月不用到相恋
2楼2011-11-10 21:43:34
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