One-step unipolar pulse electrodeposition of nickel hexacyanoferrate/chitosan/carbon nanotubes film and its application in hydrogen peroxide sensor
One-step unipolar pulse electrodeposition of nickel hexacyanoferrate/chitosan/carbon nanotubes film and its application in hydrogen peroxide sensor
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DOI：
10.1016/j.snb.2011.12.099
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发表时间：
2012-02
影响因子：
8.4
通讯作者：
Zhongde Wang;Xiaogang Hao;Zhonglin Zhang;Shibin Liu;Zhenhai Liang;G. Guan
中科院分区：
文献类型：
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作者：
Zhongde Wang;Xiaogang Hao;Zhonglin Zhang;Shibin Liu;Zhenhai Liang;G. Guan
单极脉冲波形由导通期外加阳极电位和关断期开路电位组成。采用单极脉冲电沉积（UPED）技术在过氧化氢（H2O2）传感器电极表面制备了结构可控的六氰高铁酸镍/壳聚糖/碳纳米管（NiHCF/CS/CNTs）纳米复合薄膜。采用一步法电沉积NiHCF/CS/CNTs膜，制备了不溶性NiHCF纳米颗粒，整个过程仅需几分钟。采用扫描电镜（SEM）和能谱x射线（EDS）对NiHCF/CS/CNTs膜的形貌和组成进行了表征。随着CNTs的加入，形成的NiHCF/CS/CNTs体系与NiHCF协同作用，由于CNTs优异的电子转移能力，NiHCF的氧化还原活性显著提高。电化学实验表明，改性电极可以低电位（−0.2V）检测H2O2，对H2O2的还原表现出较高的电催化活性。检测h2o2的线性范围为0.04 ~ 5.6 mm，灵敏度为654mAM−1cm−2，响应速度快（小于2s）。h2o2的检出限低至2.8×10−7M （S/N=3）。
Unipolar pulse waveforms consist of an applied anode potential during the on-period and an open-circuit potential during the off-period. Unipolar pulse electrodeposition (UPED) was used to fabricate nickel hexacyanoferrate/chitosan/carbon nanotubes (NiHCF/CS/CNTs) nanocomposite films with controllable structure on the electrode surface of a hydrogen peroxide (H2O2) sensor. One-step electrodeposition of NiHCF/CS/CNTs film with insoluble-structure NiHCF nanoparticles was performed, and the whole procedure took only several minutes. The morphology and the composition of the NiHCF/CS/CNTs film were characterized by scanning electron microscopy (SEM) and energy dispersive X-ray (EDS). With the introduction of CNTs, the NiHCF/CS/CNTs system formed showed synergy between CNTs and NiHCF with a significant improvement of redox activity of NiHCF due to the excellent electron-transfer ability of CNTs. Electrochemical experiments revealed that the modified electrode allowed low potential (−0.2V) detection of H2O2and showed high electrocatalytic activity towards the reduction of H2O2. The linear range for the detection of H2O2was 0.04–5.6mM with a high sensitivity of 654mAM−1cm−2and a rapid response (less than 2s). The detection limit for H2O2was as low as 2.8×10−7M (S/N=3).