本文選題：乙醇氧化　切入點(diǎn)：電催化　出處：《稀有金屬》2017年06期 　論文類型：期刊論文

【摘要】：通過(guò)電沉積法在碳紙表面制備了枝狀銀微納結(jié)構(gòu)(Ag-Fr),再利用電置換反應(yīng)(GRR),在枝狀銀表面置換上一層鈀元素,形成枝狀銀-鈀復(fù)合材料(Ag_xPd_y-Fr)。所得復(fù)合材料的形貌和成分經(jīng)過(guò)粉末X射線衍射(XRD)、掃描電鏡(SEM)、電感耦合等離子體原子發(fā)射光譜(ICPOES)等手段表征。利用電化學(xué)方法研究了枝狀銀-鈀復(fù)合材料Ag_xPd_y-Fr在堿性條件下對(duì)乙醇的電催化氧化活性,并與與商業(yè)Pd/C催化劑進(jìn)行了比較。通過(guò)對(duì)比,在制備的幾種催化劑中,Ag_(94)Pd_6-Fr在堿性條件下對(duì)乙醇的電催化氧化活性最高。由電催化氧化乙醇(EOR)的循環(huán)伏安(CVs)研究可知,乙醇在Ag_(94)Pd_6-Fr上的正向掃描氧化峰電流密度最高,為~33 m A·cm~(-2),約為Pd/C上的11倍,且起始峰電位約比Pd/C上的低0.08 V。乙醇在Ag_(91)Pd_9-Fr和Ag_(87)Pd_(13)-Fr上的正向掃描氧化峰電流密度分別為Pd/C上的9.3倍和5.4倍,起始峰電位分別比Pd/C上的低0.06和0.01 V。當(dāng)置換時(shí)間超過(guò)2 h后,枝狀結(jié)構(gòu)的細(xì)微結(jié)構(gòu)消失,整個(gè)結(jié)構(gòu)間的空隙變小,比表面積減小,加上表面AgCl沉淀的生成和覆蓋,雖然此時(shí)枝狀復(fù)合材料的鈀含量增,但電催化活性較低。
[Abstract]:The dendritic silver micro-nano structure (Ag-Fran) was prepared on the surface of carbon paper by electrodeposition. A palladium element was replaced on the dendritic silver surface by electroreplacement reaction (GRRN). The morphology and composition of the composite were characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and inductively coupled plasma atomic emission spectrometry (ICPOESs). The electrocatalytic oxidation activity of dendritic silver palladium composite Ag_xPd_y-Fr for ethanol under alkaline conditions. Compared with commercial Pd/C catalysts, the electrocatalytic oxidation of ethanol was the highest in the prepared catalysts. The results showed that the electrocatalytic oxidation of ethanol by cyclic voltammetry was the highest in alkaline condition, and the cyclic voltammetric voltammetry (CV) of the electrocatalytic oxidation of ethanol-eor was obtained by using cyclic voltammetric voltammetry (CV), and the results showed that the electrocatalytic oxidation of ethanol was the highest in alkaline condition. The peak current density of the forward scan oxidation peak of ethanol on Ag_(94)Pd_6-Fr was the highest, which was 33 Ma 路cm ~ (-2), about 11 times of that on Pd/C, and the initial peak potential was about 0.08 V lower than that on Pd/C. The current density of the forward scanning oxidation peak of ethanol on Ag_(91)Pd_9-Fr and Ag_(87)Pd_(13)-Fr was 9.3 and 5.4 times of that on Pd/C, respectively, and the peak current density of ethanol on Ag_(91)Pd_9-Fr and Ag_(87)Pd_(13)-Fr was 9.3 times and 5.4 times higher than that on Pd/C, respectively, and the initial peak potential was 0.08V lower than that on Pd/C. The initial peak potential was 0.06 and 0.01V lower than that on Pd/C, respectively. When the replacement time was more than 2 h, the fine structure of the branched structure disappeared, the void between the whole structure became smaller, the specific surface area decreased, and the surface AgCl precipitation was formed and covered. Although the palladium content of the dendritic composites increased at this time, the electrocatalytic activity was lower.
【作者單位】： 東莞理工學(xué)院生態(tài)環(huán)境與建筑工程學(xué)院;東莞理工學(xué)院廣東省新型納米材料研究與應(yīng)用工程技術(shù)中心;
【基金】：國(guó)家自然科學(xué)基金項(xiàng)目(21475022,21505019) 廣東省自然科學(xué)基金項(xiàng)目(2015A030310272) 廣東省科技計(jì)劃項(xiàng)目(2015B090927007) 廣東省創(chuàng)新強(qiáng)校工程項(xiàng)目(2014KZDXM073,2014KTSCX181,2015KCXTD029)資助
【分類號(hào)】：O643.36;TM911.4

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