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首页> 外文期刊>Electrocatalysis >Electrochemically Reduced Graphene Oxide - Noble Metal Nanoparticles Nanohybrids for Sensitive Enzyme-Free Detection of Hydrogen Peroxide
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Electrochemically Reduced Graphene Oxide - Noble Metal Nanoparticles Nanohybrids for Sensitive Enzyme-Free Detection of Hydrogen Peroxide

机译：电化学还原的石墨烯氧化物 - 贵金属纳米颗粒纳米组基用于敏感的酶无过氧化物检测

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摘要

Electrochemically reduced graphene oxide (ERGO) is a versatile material for the electrode modification, which enables modification of the physicochemical properties of the surface by the reduction and reoxidation of oxygen groups. The oxygen functional groups and structural defects of ERGO deposited on a layer of metal nanoparticles facilitate the electron transport and enhance the electrocatalytic properties of the nanoparticles. ERGO layers show moderate-intrinsic electrocatalytic properties towards the electrochemical reduction of hydrogen peroxide. In this contribution, we present studies of ERGO layers on the top of the nanoparticle layer composed of gold nanoparticles stabilized with silicotungstate ligands (Au/SiW12), silver nanoparticles stabilized with silicotungstate ligands (Ag/SiW12), and silver nanoparticles stabilized with phosphomolybdate ions (Ag/PMo12). The nanoparticles are prepared by the reduction of the chloroauric acid or silver nitrate by the partially reduced forms of H4SiW12O40 or H3PMo12O40 acid. The films of nanoparticles are conditioned by the repetitive potential cycling at pH = 6 before the deposition of the graphene oxide (GO) layer. The GO layer is reduced by scanning the potential between - 0.4 and - 1.2 V vs. SCE. Combination of ERGO with Au/SiW12 or Ag/SiW12 nanoparticles results in synergistic enhancement of amperometric responses to hydrogen peroxide. The electrocatalytic current values observed for the NPs-ERGO layers are higher than the sum of the current for the pure NPs layers and the ERGO layer deposited on a glassy carbon electrode. The Ag/PMo12 nanoparticles show poor electrocatalytic currents due to possible formation of aggregate structures. Infrared and Raman spectroscopies are applied to investigate the electrocatalytic layers.
机译：电化学还原的石墨烯氧化物（ERGO）是用于电极改性的通用材料，其能够通过氧基团的还原和再氧化来改变表面的物理化学性质。沉积在金属纳米粒子层上的氧官能团和结构缺陷促进了电子传输并增强了纳米颗粒的电催化性质。 ERGO层显示出适度的内在电催化性能朝向过氧化氢的电化学减少。在这一贡献中，我们在纳米粒子层顶部呈现了由硅纳米粒子（Au / Siw12）稳定的金纳米颗粒的顶部的研究，用硅钨酸盐配体（Ag / Siw12）稳定的银纳米粒子，并用磷钼离子稳定的银纳米粒子（ag / pmo12）。通过通过部分还原的H4SIW12O40或H3PMO12O40酸还原氯硼酸或硝酸银，通过将纳米胺或硝酸银制备。在沉积石墨烯氧化物（GO）层之前，通过在pH = 6的重复电位循环循环调节纳米颗粒的薄膜。通过扫描 - 0.4和-1.2 V与SCE之间的电位降低了Go层。使用Au / siw12或Ag / siw12纳米粒子的Ergo的组合导致对过氧化氢的安培反应的协同增强。对于NPS-ERGO层观察到的电催化电流值高于纯NPS层的电流和沉积在玻璃状碳电极上的电流之和。由于可能的聚集结构形成，Ag / PMO12纳米颗粒显示出差的电催化电流。应用红外和拉曼光谱法研究电催化层。

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