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首页> 外文期刊>Electroanalysis >Simple Electrodeposition of Dendritic Pd Without Supporting Electrolyte and Its Electrocatalytic Activity Toward Oxygen Reduction and H_2O_2 Sensing
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Simple Electrodeposition of Dendritic Pd Without Supporting Electrolyte and Its Electrocatalytic Activity Toward Oxygen Reduction and H_2O_2 Sensing

机译:不带电解质的简单枝状钯电沉积及其对氧还原和H_2O_2传感的电催化活性

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摘要

Metallic palladium (Pd) electrocatalysts for oxygen reduction and hydrogen peroxide (H_2O_2) oxidation/reduction are prepared via electroplating on a gold metal substrate from dilute (5 to 50 mM) aqueous K_2PdCl_4 solution. The best Pd catalyst layer possessing dendritic nanostructures is formed on the Au substrate surface from 50 mM Pd precursor solution (denoted as Pd-50) without any additional salt, acid or Pd templating chemical species. The Pd-50 consisted of nanostructured dendrites of polycrystalline Pd metal and micropores within the dendrites which provide high catalyst surface area and further facilitate reactant mass transport to the catalyst surface. The electrocatalytic activity of Pd-50 proved to be better than that of a commercial Pt (Pt/C) in terms of lower overpotential for the onset and half-wave potentials and a greater number of electrons (n) transferred. Furthermore, amperometric i-t curves of Pd-50 for H_2O_2 electrochemical reaction show high sensitivities (822.2 and -851.9 μAmM~(-1) cm~(-2)) and low detection limits (1.1 and 7.91 mM) based on H_2O_2 oxidation H_2O_2 reduction, respectively, along with a fast response (<1 s).
机译:通过从稀(5至50 mM)的K_2PdCl_4水溶液中电镀在金金属基底上,制备了用于氧还原和过氧化氢(H_2O_2)氧化/还原的金属钯(Pd)电催化剂。在没有任何其他盐,酸或Pd模板化学物质的情况下,由50 mM Pd前驱物溶液(表示为Pd-50)在Au基材表面上形成具有树枝状纳米结构的最佳Pd催化剂层。 Pd-50由多晶Pd金属的纳米结构树枝状晶体和树枝状晶体中的微孔组成,可提供高催化剂表面积并进一步促进反应物向催化剂表面的传输。 Pd-50的电催化活性被证明比起商用Pt(Pt / C)更好,这是因为较低的起始电势和半波电势的过电势以及更多的电子转移(n)。此外,基于H_2O_2氧化H_2O_2的还原反应,Pd-50对H_2O_2电化学反应的电流法曲线显示了高灵敏度(822.2和-851.9μAmM〜(-1)cm〜(-2))和低检测限(1.1和7.91 mM)。 ,以及快速响应(<1 s)。

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