南京理工大学张树鹏研究组分享 http://blog.sciencenet.cn/u/shupeng2009

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祝贺陈多哲和王霜同学合作论文在Journal of The Electrochemical Society发表

已有 549 次阅读 2019-11-11 23:22 |个人分类:点滴成果|系统分类:论文交流

Bionics-inspired strong coupling of streptococcus-like NiCo2O4 to needle-like MnO2 for enhanced electrocatalytic determination of glucose

 

Duozhe Chena,1, Shuang Wanga,1, Maoxiang Liua, Juanjuan Gaoa, Haiou Songb,*, Shupeng Zhanga,*

1 D.Z. Chen and S. Wang contributed equally to this work.


Abstract

 

Bionics-inspired streptococcus-like NiCo2O4 coated needle-like MnO2 architecture has been synthesized successfully, denoted as NiCo2O4-MnO2, and the nonenzymatic electrochemical sensor based on NiCo2O4-MnO2 exhibits highly sensitive determination towards glucose. MnO2 nanowires are regarded as effective nucleation sites, which allows uniformly growing of NiCo2O4 as electrocatalytic centers on its surface by a hydrothermal method. The rational combination of streptococcus-like NiCo2O4 and needle-like MnO2 can effectively prevent the aggregation of nanomaterials due to the formation of 3D network, promote the electron transportation, and provide more electrocatalytic sites. The attractive nanostructure and composition were better confirmed by scanning electron microscopy, transmission electron microscopy and X-ray photoelectron spectroscopy, etc. The strong coupling of NiCo2O4-MnO2 inspires the synergistic effect, showing a low detection limit of 0.036 μM (S/N = 3) for glucose in 0.1 M NaOH, a high sensitivity of 2887.57 μAmM−1cm−2 and a wide response range (from 1 to 7100 μM). Moreover, the novel sensor exhibited high stability and good reproducibility. The sensor was highly selective to glucose in the presence of commonly interfering species like dopamine, uric acid, ascorbic acid, sodium chloride, fructose, galactose and mannose, and successfully applied to sensing glucose concentration in human serum samples.

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