SCHEDULED MAINTENANCE
Rapid preparation of self-supported nickel–iron oxide as a high-performance glucose sensing platform†
*a
and
Haiwei
Du
*a
Abstract
Nickel–iron based electrocatalysts that display a highly sensitive electrochemical response are promising candidates for non-enzymatic glucose sensors. In this work, we report a rapid (∼10 min) and controllable one-step electrodeposition of NiFeOx supported on nickel foam (NF) and carbon cloth (CC) as electrochemical glucose sensing platforms. Material characterization studies reveal that the as-electrodeposited NiFeOx is composed of tiny nanoparticles with a lower crystallinity degree and abundant oxygen vacancies. On the one hand, the lower charge transfer resistance allows NiFeOx/NF to achieve a fast charge transfer kinetics compared to pristine NF. On the other hand, NiFeOx/NF exhibits a larger double-layer capacitance (Cdl) and superhydrophilic surface state, which result in an increased electrochemical surface area and enhanced affinity to glucose molecules. Consequently, the NiFeOx/NF glucose sensor presents a better sensing response (sensitivity: 2320 μA mM−1 cm−2 and the limit of detection: 0.094 μM in the linear range from 0.1–2.1 mM), an excellent selectivity against interfering substances, and high stability for over three weeks. In addition, the electrodeposition-derived NiFeOx is able to detect glucose in actual samples and also shows a promising prospect in flexible devices. This work not only offers a fast fabrication of the NiFeOx electrode but also highlights the potential use of Ni–Fe oxides for enzyme-free glucose sensing.
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