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Engineering the valence state of ZIF-67 by Cu2O for efficient nonenzymatic glucose detection

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Abstract

The valence state regulation of Co-based electrocatalysts is extremely important and greatly challenging to enhance the electrochemical performance toward glucose oxidation. Herein, Cu2O@ZIF-67 composites with fine-tuned valence states were rationally constructed for boosting glucose oxidation. X-ray photoelectron spectroscopy (XPS) and cyclic voltammetry (CV) analysis confirm that the content of the high valence state Co (Co3+) in Cu2O@ZIF-67 is much higher than that in the individual ZIF-67 due to the synergistic effects between ZIF-67 and Cu2O. As a result, Co3+-rich Cu2O@ZIF-67 composite exhibits remarkable activity toward glucose electro-oxidation with two linear response ranges of glucose concentration, from 0.01 to 10 mM and 10 to 16.3 mM, high sensitivities of the linear ranges (307.02 and 181.34 μA mM−1 cm−2) as well as a low detection limit (6.5 μM). This research provides a novel avenue for the progress of highly efficient electrocatalysts for nonenzymatic glucose oxidation.

Graphical abstract: Engineering the valence state of ZIF-67 by Cu2O for efficient nonenzymatic glucose detection

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Article information


Submitted
12 Jan 2020
Accepted
03 Mar 2020
First published
04 Mar 2020

J. Mater. Chem. B, 2020, Advance Article
Article type
Paper

Engineering the valence state of ZIF-67 by Cu2O for efficient nonenzymatic glucose detection

N. Yang, K. Guo, Y. Zhang and C. Xu, J. Mater. Chem. B, 2020, Advance Article , DOI: 10.1039/D0TB00094A

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