State Key Laboratory of Applied Organic Chemistry, Laboratory of Special Function Materials and Structure Design of the Ministry of Education, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China.
J Mater Chem B. 2020 Apr 8;8(14):2856-2861. doi: 10.1039/d0tb00094a.
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.
钴基电催化剂的价态调控对于提高其对葡萄糖氧化的电化学性能极为重要，但极具挑战性。在此，构建了具有精细调控价态的 Cu2O@ZIF-67 复合材料，以提高葡萄糖氧化性能。X 射线光电子能谱（XPS）和循环伏安法（CV）分析证实，由于 ZIF-67 和 Cu2O 之间的协同作用，Cu2O@ZIF-67 中高价态 Co（Co3+）的含量远高于单独的 ZIF-67。因此，富含 Co3+的 Cu2O@ZIF-67 复合材料对葡萄糖电氧化表现出显著的活性，具有两个线性响应范围的葡萄糖浓度，分别为 0.01 至 10 mM 和 10 至 16.3 mM，线性范围的高灵敏度（307.02 和 181.34 μA mM-1 cm-2）以及低检测限（6.5 μM）。这项研究为高效非酶葡萄糖氧化电催化剂的发展提供了新途径。
