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關(guān)于K-L方程計(jì)算電荷傳輸數(shù),Levich equation/Koutecky-Levich 已有6人參與
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小木蟲(chóng)上討論這個(gè)問(wèn)題的結(jié)論林林總總的版本無(wú)數(shù)個(gè),但是都沒(méi)有統(tǒng)一的定論,最近我對(duì)這個(gè)問(wèn)題進(jìn)行了研究,發(fā)現(xiàn)這只是部分文章在引用的時(shí)候沒(méi)有注明,而且自己文章也沒(méi)有注明造成了現(xiàn)在的計(jì)算不準(zhǔn)問(wèn)題,我對(duì)自己最近的研究做以下描述: 1、我認(rèn)為標(biāo)準(zhǔn)的解釋?zhuān)▉?lái)自必應(yīng)搜索,非本人所寫(xiě)) 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(xiě)明了各種單位的使用,而且和參考文獻(xiàn)出處,我在對(duì)不同的實(shí)驗(yàn)室,不同的材料,以及不同的酸堿條件下驗(yàn)證后發(fā)現(xiàn),結(jié)論是對(duì)的。根據(jù)最近幾位木蟲(chóng)朋友說(shuō)算不準(zhǔn)的數(shù)據(jù)驗(yàn)證后都是數(shù)據(jù)處理錯(cuò)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(shí)是rad/min)-----------還需要轉(zhuǎn)為rad/s--------------400*2*3.14/60, 然后開(kāi)根號(hào)取倒數(shù)。 2.如果用0.2時(shí) 不需要轉(zhuǎn)化為(轉(zhuǎn)/秒) 跟據(jù)以上公式可以知道, 開(kāi)根號(hào)(2*3.14/60)然后乘 0.62 剛好就是0.2006. 所以0.2對(duì)應(yīng)的直接是轉(zhuǎn)/分鐘 3.簡(jiǎn)化版的K-L公式方便大家直接用,至今還沒(méi)發(fā)現(xiàn)不適合(主要在Pt系和Ag系,Co氧化物中試過(guò)): 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(xué)測(cè)試 | 能源儲(chǔ)存與轉(zhuǎn)化 |
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