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首页> 外文期刊>Applied Surface Science >Synergistically improved electrochemical performance and its practical application of graphene oxide stabilized nano Ag_2S by one-pot homogeneous precipitation
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Synergistically improved electrochemical performance and its practical application of graphene oxide stabilized nano Ag_2S by one-pot homogeneous precipitation

机译：一锅均相沉淀协同提高电化学性能及其在氧化石墨烯稳定的纳米Ag_2S上的实际应用

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摘要

Based on the high specific area and superior electrochemical property of graphene oxide and excellent electro-catalytic performance of Ag2S, graphene oxide stabilized nano Ag2S composite (GO-Ag2S) was proposed and constructed in this work by one-pot homogeneous precipitation. It was expected GO-Ag2S could possess special stability, dispersion and electrochemical activity, which were estimated by SEM, TEM, EDS, XRD, FT-IR, cyclic voltammetry and electrochemical impedance spectra. It was noted that there was a synergistically improved electrochemical performance between Ag2S and GO in as-prepared GO-Ag2S owing to their strong interactions. Especially, it exhibited an exclusively electrochemical response to heavy metal Hg2+ with high sensitivity once modified onto glassy carbon electrode (GCE). Under the optimized conditions, a wide liner range of 0.0-290.0 x 10(-10) mol/L and a low detection limit of 8.63 x 10(-12) mol/L for Hg2+ could be reached. Once applied for sensing Hg2+ in really environmental water samples and fruit juice samples, the recovery was between 95.5% and 105.7%. Mercury amalgam formed onto the surface of nano Ag2S was accordingly proposed for GO-Ag2S to recognize Hg2+ after the electro-catalytic redox of Hg2+.
机译：鉴于氧化石墨烯的高比表面积和优异的电化学性能，以及优良的Ag2S电催化性能，提出并通过一锅均相沉淀法构建了氧化石墨烯稳定的纳米Ag2S复合材料（GO-Ag2S）。通过SEM，TEM，EDS，XRD，FT-IR，循环伏安法和电化学阻抗谱对GO-Ag2S具有特殊的稳定性，分散性和电化学活性进行了预期。注意到，由于制备的GO-Ag2S之间的强相互作用，Ag2S和GO之间的电化学性能协同改善。尤其是，一旦修饰到玻璃碳电极（GCE）上，它就表现出对重金属Hg2 +的唯一电化学响应，并具有高灵敏度。在优化的条件下，可以实现0.0-290.0 x 10（-10）mol / L的宽线性范围和Hg2 +的低检测限8.63 x 10（-12）mol / L。一旦用于检测实际环境水样和果汁样中的Hg2 +，回收率在95.5％至105.7％之间。因此提出了在纳米Ag2S表面形成汞齐，以便GO-Ag2S在Hg2 +电催化氧化还原后识别Hg2 +。

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