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550 results on '"Yang, Ziyin"'

48. B‐Doping Induced Formation of Ultrafine Co Nanoparticles for Highly Sensitive Non‐Enzymatic Glucose Sensing.

Author

Yin, Hang, Zhang, Chongchao, Bai, Xiao, Yang, Ziyin, and Liu, Zhe

Subjects
GLUCOSE analysis, GLUCOSE, OXIDATION of glucose, NANOPARTICLES, CARBON monoxide detectors, ION exchange (Chemistry), DETECTION limit
Abstract

Doping is one of the effective methods to improve the performance of sensors. Here, we reported that B‐doping can induce the formation of ultrafine Co nanoparticles for realizing highly sensitivity non‐enzymatic glucose sensing. Co/NC and Co/BNC were prepared by ion exchange and pyrolysis methods. It is interesting to find that B doping can achieve spatial isolation and prevent metal aggregation during MOF pyrolysis. This made the particle size of Co nanoparticles smaller and more uniform, which enriches the active site and thus improves the sensing performance for glucose. The electrochemical results indicate that Co/BNC exhibits strong electrocatalytic activity toward glucose oxidation and the non‐enzymatic sensor based on Co/BNC shows excellent performance for glucose analysis with a wide linear range of 0.4 μM–0.522 mM, a high sensitivity of 1064.3 μA mM−1 cm−2 and a low detection limit of 0.08 μM (S/N=3). Therefore, this study demonstrated Co/BNC as a promising glucose sensing material and also provided a novel strategy for improving electrochemical sensing performance through doping. [ABSTRACT FROM AUTHOR]

Published
2023
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49. Ru Nanoclusters on MnO2 Nanotubes for Boosting Electrochemical Nonenzymatic H2O2 Sensing.

Author

Yang, Ziyin, Tian, Zhigao, and Qi, Chengcheng

Abstract

The development of a high-performance electrocatalyst is the key to the construction of highly sensitive electrochemical sensing methods. In this work, we design Ru nanoclusters supported on MnO2 nanotubes (c-Ru/MnO2) as an electrocatalyst for boosting electrochemical nonenzymatic hydrogen peroxide (H2O2) sensing. c-Ru/MnO2 is synthesized based on a facile hydrothermal method, followed by cation exchange and calcination. The obtained c-Ru/MnO2 nanocomposite is characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and electrochemical methods. Electrochemical studies and theoretical calculations reveal that the anchoring of Ru nanoclusters not only makes MnO2 nanotubes exhibit higher electrochemical surface area and faster electron transfer rate but also promotes the strong adsorption of H2O2 and optimizes the interactions with the key intermediates OOH*/OO*. Thanks to the synergistic effect between Ru nanoclusters and MnO2 nanotubes, the sensor based on c-Ru/MnO2 exhibits a low anode peak potential of 0.42 V and an extremely high sensitivity of 2967.9 μA mM–1 cm–2 toward H2O2. Therefore, c-Ru/MnO2 is demonstrated to be an advanced electrocatalyst for sensitive electrochemical sensing of H2O2. [ABSTRACT FROM AUTHOR]

Published
2023
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