Abstract In this work, gold nanomaterials were obtained using aqueous extracts of black carrots varying the molar ratio between the extract and the gold precursor salt (1:10, 1:5 and 2:5). Additionally, Au nanoparticles were obtained by the Turkevich method as reference material (Au Turkevich). Transmission electron micrographs indicated that a 1:5 ratio allowed to obtain a mixture of gold shapes like triangular, plate, rod, wire, and hemispherical shapes. The electrocatalytic evaluation for 0.5 M glycerol electro-oxidation indicated that Au (1:5) displayed higher current density (298.26 vs. 230.25 mA mg−1), and a more negative onset potential (ΔE = 150 mV) than Au Turkevich. In addition, Au (1:5) displayed higher current density during the electro-oxidation of 1 M crude glycerol (466.91 vs. 244.73 mA mg−1) with a similar potential difference. The improvement in activity and durability presented by Au (1:5) was attributed to the abundance of {1 0 0} facets as was determined by X-ray diffraction and HR-TEM.

中文翻译：

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用于粗甘油电氧化的{1 0 0}面生物金纳米材料的合成及应用

摘要 在这项工作中，通过改变提取物与金前体盐之间的摩尔比（1:10、1:5 和 2:5）的黑胡萝卜水提取物，获得了金纳米材料。此外，通过Turkevich方法获得Au纳米颗粒作为参考材料（Au Turkevich）。透射电子显微照片表明，1:5 的比例允许获得三角形、板、棒、线和半球形等金形状的混合物。0.5 M 甘油电氧化的电催化评估表明，Au (1:5) 显示出比 Au Turkevich 更高的电流密度（298.26 对 230.25 mA mg-1）和更负的起始电位（ΔE = 150 mV）。此外，Au (1:5) 在 1 M 粗甘油（466.91 对 244.73 mA mg-1）的电氧化过程中显示出更高的电流密度，具有相似的电位差。