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[求助]
菜鳥求救:請教一個(gè)關(guān)于工作電極和反電極的問題
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我要對(duì)一個(gè)導(dǎo)電高聚物通過加正電壓和負(fù)電壓來發(fā)實(shí)現(xiàn)其氧化態(tài)和還原態(tài)的反復(fù)轉(zhuǎn)變。查到文獻(xiàn)是用如下方法實(shí)現(xiàn)的: Electrochemical switching and EIS measurements were performed using a two-electrode configuration, with the working and counter electrodes attached to opposite ends of the sample, which had a typical size of 1.5 cm × 1.5 cm. The reference and counter electrodes were shorted as is typically done for two-electrode impedance measurements. The working and counter electrodes were interfaced onto the surface of the sample through thin strips of highly conductive copper metal (sheet resistance ∼1 Ohm), dimensions 3 mm × 10 mm × 0.1 mm.The material was switched to its reduced state by application of a − 1.0 V potential to the working electrode, for an appropriate period of time until a charge of ∼ 0.1 C had been passed. 但我還是沒有搞清楚,有如下的疑問,希望知道的蟲子能解答多少是多少: (1)工作電極和反電極是分別做在樣品同一個(gè)表面上的兩端嗎? (2)當(dāng)對(duì)工作電極加-1.0V電壓的時(shí)候,反電極的電壓不是應(yīng)該是 +1.0V 嗎?那么正負(fù)電壓都同時(shí)加到樣品上了,如何會(huì)實(shí)現(xiàn)樣品從氧化態(tài)到還原態(tài)呢? (3)如果我要實(shí)現(xiàn)從還原態(tài)再回到到達(dá)氧化態(tài),就在工作電極加+1.0V的電壓就可以了嗎? (4) 我設(shè)想如果把樣品一個(gè)表面連到工作電極上,而樣品的另個(gè)表面貼一層固體電解質(zhì),在固體電解質(zhì)上再貼一層非常導(dǎo)電的材料并將導(dǎo)電材料連到反電極上,在工作電極上加+1v或-1v的電壓是否也可以實(shí)現(xiàn)樣品的氧化還原態(tài)轉(zhuǎn)換? [ Last edited by ZANCAI on 2012-6-5 at 02:45 ] |
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新蟲 (初入文壇)
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鐵桿木蟲 (小有名氣)
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不能這么說,只能說如果在工作電極上施加+1V的電位,工作電極上發(fā)生氧化反應(yīng),則對(duì)電極上應(yīng)該要發(fā)生還原反應(yīng),且還原反應(yīng)電流要與氧化反應(yīng)電流相一致。但是對(duì)電極上的還原電位是不確定的,因?yàn)榭梢韵胂,?duì)電極上發(fā)生的極化反應(yīng)是要滿足工作電極上需要的電流的,因此工作電極上的電流變化也會(huì)導(dǎo)致對(duì)電極上的電位變化?偨Y(jié)起來就是:工作電極和對(duì)電極相匹配的不是電位,而是電流。 |
鐵桿木蟲 (小有名氣)
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從“ The working and counter electrodes were interfaced onto the surface of the sample through thin strips of highly conductive copper metal”一句中判斷應(yīng)該是這樣。但是這好像與一般的電化學(xué)反應(yīng)有很大的不同,我不理解這樣做好像是把導(dǎo)電高聚物當(dāng)作一個(gè)電解池,但是當(dāng)施加一個(gè)高電位氧化時(shí),氧化反應(yīng)所需要的物種從何而來?不會(huì)只是電子的得失吧?樓主能否上全文?或者文獻(xiàn)的題目也行。 |
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