| 5 | 1/1 | 返回列表 |
| 查看: 7392 | 回復: 7 | ||||||
| 當前只顯示滿足指定條件的回帖,點擊這里查看本話題的所有回帖 | ||||||
[交流]
關于K-L方程計算電荷傳輸數(shù),Levich equation/Koutecky-Levich 已有6人參與
|
||||||
|
小木蟲上討論這個問題的結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,先歸結如下: 1.如果用的是0.62 那么 你 轉數(shù)必須轉化:例如400rpm-----轉為-----400*2*3.14(這時是rad/min)-----------還需要轉為rad/s--------------400*2*3.14/60, 然后開根號取倒數(shù)。 2.如果用0.2時 不需要轉化為(轉/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對應的直接是轉/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為轉移電子數(shù)。 |
氧還原反應ORR | 電化學測試 | 能源儲存與轉化 |
新蟲 (初入文壇)
| 最具人氣熱帖推薦 [查看全部] | 作者 | 回/看 | 最后發(fā)表 | |
|---|---|---|---|---|
|
[考研] 0703化學 305求調(diào)劑 +4 | FY_yy 2026-03-14 | 4/200 |
|
|---|---|---|---|---|
|
[考研] 085410人工智能專碩317求調(diào)劑(0854都可以) +3 | xbxudjdn 2026-03-18 | 3/150 |
|
|
[考研] 321求調(diào)劑 +3 | 何潤采123 2026-03-18 | 3/150 |
|
|
[考研] 267一志愿南京工業(yè)大學0817化工求調(diào)劑 +8 | SUICHILD 2026-03-12 | 8/400 |
|
|
[考研] 299求調(diào)劑 +5 | △小透明* 2026-03-17 | 5/250 |
|
|
[考研] 考研求調(diào)劑 +3 | 橘頌. 2026-03-17 | 4/200 |
|
|
[考研] 326求調(diào)劑 +5 | 上岸的小葡 2026-03-15 | 6/300 |
|
|
[考研] 278求調(diào)劑 +3 | Yy7400 2026-03-13 | 3/150 |
|
|
[考研] 070300化學學碩求調(diào)劑 +6 | 太想進步了0608 2026-03-16 | 6/300 |
|
|
[考研] 070305求調(diào)劑 +3 | mlpqaz03 2026-03-14 | 4/200 |
|
|
[考研] 本科南京大學一志愿川大藥學327 +3 | 麥田耕者 2026-03-14 | 3/150 |
|
|
[考研] 復試調(diào)劑 +3 | 呼呼?~+123456 2026-03-14 | 3/150 |
|
|
[考研] 281求調(diào)劑 +9 | Koxui 2026-03-12 | 11/550 |
|
|
[考研] 考研調(diào)劑 +4 | 芬達46 2026-03-12 | 4/200 |
|
|
[考研] 307求調(diào)劑 +5 | 超級伊昂大王 2026-03-12 | 5/250 |
|
|
[考研] 274求調(diào)劑 +3 | S.H1 2026-03-12 | 3/150 |
|
|
[考研] 0817化學工程與技術考研312分調(diào)劑 +3 | T123 tt 2026-03-12 | 3/150 |
|
|
[考研] 070303一志愿西北大學學碩310找調(diào)劑 +3 | d如愿上岸 2026-03-13 | 3/150 |
|
|
[考博] 福州大學楊黃浩課題組招收2026年專業(yè)學位博士研究生,2026.03.20截止 +3 | Xiangyu_ou 2026-03-12 | 3/150 |
|
|
[考研] 321求調(diào)劑(食品/專碩) +3 | xc321 2026-03-12 | 6/300 |
|