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直接氣相還原法制備金屬銥及其氧還原活性
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國家高技術(shù)研究發(fā)展計(jì)劃重大項(xiàng)目 (2008AA11A106)


Direct Gas Phase Reduction of Iridium and Its Catalytic Activity
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    摘要:

    采用直接氣相還原法制備了金屬銥催化劑。通過X射線衍射 (XRD) 分析了金屬銥的物相組成，采用循環(huán)伏安 (CV) 和線性電勢掃描 (LSV) 等電化學(xué)手段評價了金屬銥的電化學(xué)性能。XRD分析結(jié)果表明在氨氣氣氛中，氧化銥經(jīng)400 ℃還原3 h能完全轉(zhuǎn)化為金屬銥單質(zhì)。CV和LSV結(jié)果表明金屬銥具有良好的氧還原電催化活性，且其氧還原起始電壓可以達(dá)到0.51 V (vs. SCE)。從原子狀態(tài)角度考慮，金屬銥的d帶空穴多于金屬鉑，最終導(dǎo)致金屬銥的氧還原電催化活性低于金屬鉑，但金屬銥具有與金屬鉑相似的氧還原電催化路徑

    Abstract:

    Iridium catalyst was prepared by a direct gas phase reduction method. The phase composition of iridium was analyzed by X-ray diffraction, and the electrochemical performance was evaluated by cyclic voltammetry (CV) and linear scanning voltage (LSV). The result of XRD shows that iridium is transformed completely from iridium oxides after 400 °C reduction for 3 h under ammonia atmosphere. According to the result of CV and LSV, iridium possesses favorable electrocatalytic activity for oxygen reduction. The onset potential of iridium for oxygen reduction reaction (ORR) achieves 0.51 V (vs. SCE). From the viewpoint of atomic states, the number of d-band vacancy of iridium is more than that of platinum which leads to the lower electrocatalytic activity of iridium than that of platinum, but the two electrocatalysts have the similar electrocatalytic paths for ORR

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汪廣進(jìn),程 鳳,潘 牧.直接氣相還原法制備金屬銥及其氧還原活性[J].稀有金屬材料與工程,2013,42(3):616~620.[Wang Guangjin, Cheng Feng, Pan Mu. Direct Gas Phase Reduction of Iridium and Its Catalytic Activity[J]. Rare Metal Materials and Engineering,2013,42(3):616~620.]
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  • 收稿日期:2012-02-16
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