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xuyuan27金蟲 (小有名氣)
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化學(xué)里關(guān)于一極化曲線實驗的翻譯
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溶液A(溶液組成：檸檬酸鈉：0．6 mol·L～)的穩(wěn)態(tài)極化曲線如圖l中曲線a所示．從 溶液的組成來看該曲線應(yīng)為析氫穩(wěn)態(tài)極化曲線，氫氣的析出電勢為一1．3 V 左右．在溶液A 中加入2．8×10 mol·L 的Na2SeO3，簡稱溶液B，溶液B的穩(wěn)態(tài)極化曲線如圖l中曲線b所示．曲線b形狀和曲線a相似，都為一光滑的曲線，中間看不出有其它還原峰存在，說明曲線b仍為析氫穩(wěn)態(tài)極化曲線；和曲線a有所不同的是：曲線b中氫氣的析出電 勢負(fù)移到一1．5 V左右，比未加Na2SeO3時，負(fù)移了0．2 V左右，證明Na2SeO3的加入使析氫的過電勢增大了．為考察Na2SeO3是如何使析氫過電勢增大的，本文首先用鐵電極在鋅錳共沉積電勢處(一1．5V)恒電勢電解溶液B 60 S，取出鐵電極用二次蒸餾 水沖洗干凈并以此電極為研究電極，在溶液A 中作穩(wěn)態(tài)極化曲線如圖l中曲線c所示．從圖中可以看出：曲線C幾乎和曲線b重合；而溶液A中并無Na2SeO3，說明鐵電極在一1．5 V對溶液B恒電勢電解時，Na2SeO。在電極上發(fā)生了電化學(xué)吸附，造成析氫過電勢增加． |
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zerohead
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溶液A(溶液組成：檸檬酸鈉：0．6 mol•L～)的穩(wěn)態(tài)極化曲線如圖l中曲線a所示．從 溶液的組成來看該曲線應(yīng)為析氫穩(wěn)態(tài)極化曲線，氫氣的析出電勢為一1．3 V 左右． The steady-state polarization curve of the solution A (0.6 mol/l sodium citrate) is shown in Figure 1 (curve a). By considering the compositions of the solution, the curve a shown in the figure is a steady-state polarization (curve) of the hydrogen evolution with a evolution potential of about 1.3V. |
2樓2010-07-24 17:33:36
lunshixiii
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xuyuan27(金幣+30, 翻譯EPI+1):非常感謝！ 2010-07-26 09:54:59
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Fig.4 shows the steady polarization curves of iron electrodes in Solution A, Solution B and special work electrode in Solution A (Curve A，Curve B and Curve C respectively). Solution A was composed of 100g/ L-1 (NH4)2SO4, and Solution B was added 0.1g/ L SeO2 in Solution A. To investigate whether SeO2 was adsorbed, the iron electrode was constant-potential electrolyzed 3 min in Solution B at -1.6V, removed and washed by double-distilled water. After the above series of processing, the electrode was used to make steady polarization curve in solution A which was Curve C. From the composition of the solutions, it can be concluded the curves are the steady polarization curve of hydrogen evolution. Comparing Curve B to Curve A, it is seen that with the adding of SeO2 the potential of hydrogen evolution moves from -1.3 V to -1.5V. Curve C is similar to curve B although the electrolytes are different. Therefore, SeO2 is able to take place adsorption on the cathode surface and facilitate further the hydrogen overvoltage. |
3樓2010-07-26 09:40:19
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