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Pt-grown carbon nanofibers for detection of hydrogen peroxide

机译：铂生长的碳纳米纤维，用于检测过氧化氢

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Removal of left-over catalyst particles from carbon nanomaterials is a significant scientific and technological problem. Here, we present the physical and electrochemical study of application-specific carbon nanofibers grown from Pt-catalyst layers. The use of Pt catalyst removes the requirement for any cleaning procedure as the remaining catalyst particles have a specific role in the end-application. Despite the relatively small amount of Pt in the samples (7.0 ± 0.2%), they show electrochemical features closely resembling those of polycrystalline Pt. In O _(2) -containing environment, the material shows two separate linear ranges for hydrogen peroxide reduction: 1–100 μM and 100–1000 μM with sensitivities of 0.432 μA μM ~(?1) cm ~(?2) and 0.257 μA μM ~(?1) cm ~(?2) , respectively, with a 0.21 μM limit of detection. In deaerated solution, there is only one linear range with sensitivity 0.244 μA μM ~(?1) cm ~(?2) and 0.22 μM limit of detection. We suggest that the high sensitivity between 1 μM and 100 μM in solutions where O _(2) is present is due to oxygen reduction reaction occurring on the CNFs producing a small additional cathodic contribution to the measured current. This has important implications when Pt-containing sensors are utilized to detect hydrogen peroxide reduction in biological, O _(2) -containing environment.
机译：从碳纳米材料中去除残留的催化剂颗粒是一个重大的科学技术问题。在这里，我们介绍了从Pt催化剂层生长的专用碳纳米纤维的物理和电化学研究。 Pt催化剂的使用消除了对任何清洁程序的要求，因为剩余的催化剂颗粒在最终应用中具有特定的作用。尽管样品中Pt的含量相对较少（7.0±0.2％），但它们的电化学特征却与多晶Pt极为相似。在含O_（2）的环境中，材料显示出两个单独的线性过氧化氢还原范围：1–100μM和100–1000μM，灵敏度为0.432μAμM〜（？1）cm〜（？2）和0.257。 μAμM〜（？1）cm〜（？2），检测限为0.21μM。在脱气溶液中，只有一个线性范围，灵敏度为0.244μAμM〜（？1）cm〜（？2），检测极限为0.22μM。我们建议在存在O _（2）的溶液中1μM和100μM之间的高灵敏度是由于发生在CNF上的氧还原反应，从而对测量电流产生小的附加阴极贡献。当使用含Pt的传感器检测生物O_（2）的环境中过氧化氢的减少时，这具有重要意义。

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