▎ 摘　　要

Here, zeolitic imidazolate framework-8 (ZIF-8)-derived N-doped porous carbon coated reduced graphene oxide (NPC@rGO) sheets have been fabricated as supporting platform to construct low-load and high-performance sensing material for electrochemical detection. In order to investigate the function of NPC@rGO sheets, Ag nanoparticles loaded in NPC@rGO (AgNPs@NPC@rGO) were prepared by the process of carbonization and porosity. Such AgNPs@NPC@rGO sheets exhibited excellent performances for the detection of H2O2, while the content of Ag in the AgNPs@NPC@rGO sheets was 16.17 wt%. The main electrochemical performance parameters of the H2O2 sensor based on AgNPs@NPC@rGO modified glassy carbon electrode (AgNPs@NPC@rGO/GCE) were the sensitivity of 493 mu A mM(-1) cm(-2), the detection limit of 1.4 mu M, and the linear detection range from 25 mu M to 15,000 mu M (R = 0.99967). The performance benefits of AgNPs@NPC@rGO sheets were considered in this work, which could be attributed to the structural and compositional advantages of NPC@rGO. On the one hand, the high-density active sites were stabilized in NPC, while NPC provided the pore structure for the diffusion of the detection target, leading to the high-efficiency electrochemical reaction. On the other hand, rGO as the core of support material played the role of structural framework and connection. (C) 2020 Elsevier B.V. All rights reserved.