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High Performance Electrocatalyst Based on MIL‐101(Cr)/Reduced Graphene Oxide Composite: Facile Synthesis and Electrochemical Detections
Author(s) -
Gu Jianxia,
Yin Xiangdang,
Bo Xiangjie,
Guo Liping
Publication year - 2018
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.201800588
Subject(s) - graphene , electrocatalyst , electrochemical gas sensor , materials science , electrochemistry , detection limit , oxide , scanning electron microscope , transmission electron microscopy , composite number , nuclear chemistry , stripping (fiber) , chemical engineering , analytical chemistry (journal) , nanotechnology , chemistry , electrode , composite material , chromatography , metallurgy , engineering
In this work, a Cr‐based MOF (MIL‐101(Cr))/reduced grapheme oxide(rGO) electrocatalyst was prepared through a one‐pot hydrothermal method. The obtained composite was characterized via scanning electron microscopy, transmission electron microscopy, X‐ray diffraction and other standard techniques. Electrochemical methods were adopted to study the electrocatalytic ability of the composite. The results imply that, compared to the single components, it exhibits higher electrocatalytic activity for the reduction of metronidazole and stripping of Cd 2+ and Pb 2+ . Optimizing the ratio of MIL‐101(Cr) and rGO, an electrochemical sensor was prepared using MIL‐101(Cr)/rGO‐20 and used for detection of metronidazole, Cd 2+ and Pb 2+ , respectively. The linear range for metronidazole can be divided in two parts, i. e. from 0.5 to 200 μM and from 200 to 900 μM. The limit of detection is 0.24 μM (S/N=3, n=10). Likewise, it also exhibits a wide linear range from 0.05 to 6.0 μM for the detection of Cd 2+ and Pb 2+ . The corresponding detection limits are found to be 5.2 nM and 3.0 nM (S/N=3, n=10), respectively. The proposed sensor also possesses superb selectivity, reproducibility, stability and can be applied to detect real samples with desired recovery rates. In addition, the possible reduction mechanism of metronidazole and adsorption mechanism of Cd 2+ and Pb 2+ were further discussed simply in this work.