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Ru-Co-Ce復(fù)合氧化物陽極制備及析氧性能研究
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國(guó)家自然科學(xué)基金(50476091); 黑龍江省自然科學(xué)基金(B200401)


Preparation of Ru-Co-Ce Electrode and Its Oxygen Evolution Performance
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    摘要:

    采用溶膠-凝膠法制備RuO2-Co3O4-CeO2(Ru-Co-Ce)復(fù)合氧化物電極，對(duì)制備電極的熱處理溫度和稀土CeO2含量進(jìn)行了優(yōu)化。利用SEM、XRD分析方法對(duì)電極表面形貌進(jìn)行表征，通過開路電壓(Eoc)、循環(huán)伏安(CV)及陽極極化曲線等手段研究電極在1.0 mol·L-1 KOH溶液中的析氧催化活性。結(jié)果表明，制備溫度對(duì)電極表面形貌有很大影響(優(yōu)選400 ℃)，復(fù)合氧化物電極中適量稀土CeO2可增強(qiáng)電極表面致密性，使RuO2晶相衍射峰減弱，峰形寬化，提高電極活性表面積，促進(jìn)活性組分RuⅢ/ RuⅣ間的轉(zhuǎn)化，使析氧過電位降低60 mV，從而提高電極析氧反應(yīng)的活性，Ce最佳比例為0.4(摩爾分?jǐn)?shù))

    Abstract:

    RuO2-Co3O4-CeO2(Ru-Co-Ce) composite oxide electrodes were prepared by sol-gel process. The parameters of electrode preparation, including the heat treatment temperature and CeO2 doping content, were optimized. The morphology and composition of the anode surface were characterized by SEM and XRD, respectively. Electrocatalytic activity of these electrodes in 1.0 mol·L-1 KOH solution were studied by means of open-circuit potential (Eoc), cyclic voltammetry (CV), voltammetric charge (q*) and polarization curve. The results show that the preparation temperature influenced electrode surface morphology greatly, and the optimal temperature was 400 oC. The CeO2 of appropriate content could increase the active surface area, reduce the grain size and enhance the electrical conductivity of the electrodes, which was in favor of catalytic reactions and redox transition from RuⅢ to RuⅣ. The anodic overpotential for oxygen evolution was decreased by 60 mV and thus the activity of oxygen evolution was improved. The maximum activity was observed with the Ce content of 0.4 mol%

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吳紅軍,阮 琴,王寶輝,劉淑芝. Ru-Co-Ce復(fù)合氧化物陽極制備及析氧性能研究[J].稀有金屬材料與工程,2010,39(6):1111~1115.[Wu Hongjun, Ruan Qin, Wang Baohui, Liu Shuzhi. Preparation of Ru-Co-Ce Electrode and Its Oxygen Evolution Performance[J]. Rare Metal Materials and Engineering,2010,39(6):1111~1115.]
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  • 收稿日期:2009-06-16
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