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關(guān)于K-L方程計算電荷傳輸數(shù),Levich equation/Koutecky-Levich 已有6人參與
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小木蟲上討論這個問題的結(jié)論林林總總的版本無數(shù)個,但是都沒有統(tǒng)一的定論,最近我對這個問題進行了研究,發(fā)現(xiàn)這只是部分文章在引用的時候沒有注明,而且自己文章也沒有注明造成了現(xiàn)在的計算不準問題,我對自己最近的研究做以下描述: 1、我認為標準的解釋(來自必應(yīng)搜索,非本人所寫) The Levich Equation models the diffusion and solution flow conditions around a rotating disk electrode (RDE). It is named after Veniamin Grigorievich Levich who first developed an RDE as a tool for electrochemical research. It can be used to predict the current observed at an RDE, in particular, the Levich equation gives the height of the sigmoidal wave observed in rotating disk voltammetry. The sigmoidal wave height is often called the Levich current. The Levich Equation is written as: J(L) = (0.620) n F A D(2/3) w(1/2)v(-1/6)C where IL is the Levich current (A) n is the number of moles of electrons transferred in the half reaction (number) F is the Faraday constant (C/mol) A is the electrode area (cm2) D is the diffusion coefficient (see Fick's law of diffusion) (cm2/s) w is the angular rotation rate of the electrode (rad/s) v is the kinematic viscosity (cm2/s) C is the analyte concentration (mol/cm3) Note: To use the equation as written above (with the leading 0.620), certain units must be used with the parameters listed (e.g. radians per second for angular rotation, NOT radians or revolutions per minute). If revolution (rotations) per minute (rpm) are used, a value of 0.201 should be used in place of 0.620. References Edit ^ John Newman, J. Phys. Chem., 1966, 70 (4), 1327-1328 ^ Bard, Allen J.; Larry R. Faulkner (2000-12-18). Electrochemical Methods: Fundamentals and Applications (2 ed.). Wiley. p. 339. ISBN 0-471-04372-9. http://www.webcitation.org/query ... 2009-10-25+19:12:26 http://www.webcitation.org/query ... 2009-10-25+19:12:23 http://www.calctool.org/CALC/chem/electrochem/levich Last edited 4 months ago by an anonymous user 這里呢作者寫明了各種單位的使用,而且和參考文獻出處,我在對不同的實驗室,不同的材料,以及不同的酸堿條件下驗證后發(fā)現(xiàn),結(jié)論是對的。根據(jù)最近幾位木蟲朋友說算不準的數(shù)據(jù)驗證后都是數(shù)據(jù)處理錯誤,先歸結(jié)如下: 1.如果用的是0.62 那么 你 轉(zhuǎn)數(shù)必須轉(zhuǎn)化:例如400rpm-----轉(zhuǎn)為-----400*2*3.14(這時是rad/min)-----------還需要轉(zhuǎn)為rad/s--------------400*2*3.14/60, 然后開根號取倒數(shù)。 2.如果用0.2時 不需要轉(zhuǎn)化為(轉(zhuǎn)/秒) 跟據(jù)以上公式可以知道, 開根號(2*3.14/60)然后乘 0.62 剛好就是0.2006. 所以0.2對應(yīng)的直接是轉(zhuǎn)/分鐘 3.簡化版的K-L公式方便大家直接用,至今還沒發(fā)現(xiàn)不適合(主要在Pt系和Ag系,Co氧化物中試過): K(擬合斜率)=1/(0.108*n) 這里 n為轉(zhuǎn)移電子數(shù)。 |
氧還原反應(yīng)ORR | 電化學測試 | 能源儲存與轉(zhuǎn)化 |
新蟲 (初入文壇)
新蟲 (初入文壇)
新蟲 (初入文壇)
銅蟲 (初入文壇)
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