Rational design of Ag nanoparticles on ZIF-67-functionalized carbon nanotube for enzymeless glucose detection and electrocatalytic water oxidation

• Published in: Journal of alloys and compounds 2022-07, Vol.910, p.164878, Article 164878
• Main Authors: Qin, Wanlin, Li, Xianliang, Zhang, Yuchi, Han, Le, Cheng, Zhijin, Li, Zhijie, Xu, Yan
• Format: Article
• Language: English
• Subjects: Aqueous solutions; Carbon nanotube; Carbon nanotubes; Electrocatalysts; Glucose; Glucose sensor; Nanoparticles; Oxidation; Photochemical reduction; Response time; Silver; Surface functionalization
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2022.164878

The development of electrocatalysts that show multifunctionality towards efficient sensing and energy applications are of great significance. Herein, we report a rational design of photochemical deposition of Ag nanoparticles (Ag NPs) on ZIF-67-decorated carbon nanotube (Ag NPs/ZIF-67 @CNT) hybrid, which exhibits dual-functional capabilities for both effective enzymeless glucose detection and electrocatalytic water oxidation. The distribution of Ag NPs on the ZIF-67-functionalized CNT can be optimized by adjusting the concentration of Ag+ aqueous solution during the light illumination process. The optimized Ag NPs/ZIF-67 @CNT composite showed superior glucose-sensing capability with a low determination limit of 0.46 μM (S/N = 3), high sensitivity of 469.4 μA·mM−1·cm−2, wide linearity detection range (0.010–7.0 mM) and short response time (less than 5 s). Also, the Ag NPs/ZIF-67 @CNT composite acting as potential electrocatalyst possessed an overpotential of 286 mV with a Tafel-slope of 80.75 mV dec−1 at 10 mA·cm−2 for high durability water-oxidation reaction. This work provided a feasible way to prepare Ag NPs decorated ZIF-67/CNT with modulated bifunctional catalytic performances via photochemical reduction strategy, which can also provide effective guidance for designing other multifunctional electrocatalysts. [Display omitted] •Photochemical deposition of Ag nanoparticles on ZIF-67 @carbon nanotube was prepared.•It showed enzymeless glucose sensing activity with a low detection limit of 0.46 μM.•High durability of water-oxidation behavior of the hybrid was also investigated.•This work provide effective way for preparing other multifunctional electrocatalysts.