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Comparative study of carbon fiber structure on the electrocatalytic performance of ZIF-67

Feng, Xiaogeng, Lin, Shourui, Li, Mian, Bo, Xiangjie, Guo, Liping
Analytica chimica acta 2017
Fourier transform infrared spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, active sites, analytical chemistry, carbon, carbon fibers, catalysts, cysteine, electrochemistry, glassy carbon electrode, mass transfer, particle size, scanning electron microscopy, transmission electron microscopy
In this study, novel ZIF-67@carbon fiber composites were fabricated by a simple and facile approach. In order to explore the influence of carbon fiber structure on enhancing the electrocatalytic efficiency of the ZIF-67, different structural carbon fibers (hollow porous carbon fiber (PCF) and solid carbon fiber (SCF)) were used for preparing ZIF-67/carbon fiber catalysts. ZIF-67/carbon fiber composites were characterized via X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy and electrochemical methods. Thanks to excellent hollow structural characteristic of PCF, ZIF-67/PCF possesses more exposed active sites, smaller particle size of ZIF-67, better conductivity, electrochemical stability, more mass transport channels as well as superior electrocatalytic abilities than ZIF-67/SCF. Furthermore, ZIF-67/PCF(1:1) sample-modified glassy carbon electrode presents a linear range to nitrobenzene that is composed by two line segments, i.e. from 0.3 to 50 μM with a sensitivity of 454.7 μA mM−1 and from 50 to 390 μM with a sensitivity of 132.0 μA mM−1, and a low detection limit of 0.16 μM. It also exhibits a wide linear response to l-cysteine in the range of 5–160 μM and 160–1580 μM with a rapidly response within 1.0 s as well as high catalytic rate constant, good stability and anti-interference ability. Our work provides useful information for searching and choosing carbon materials with excellent structure benefit to electrochemical applications.