Metal organic framework (ZIF-67)-derived Co nanoparticles/N-doped carbon nanotubes composites for electrochemical detecting of tert-butyl hydroquinone

Abstract

In this work, the framework of Co nanoparticles and nitrogen-doped carbon nanotubes (Co/NCNTs) derived from metal-organic frameworks (MOFs) through solid pyrolysis was successfully synthesized in the atmosphere of H 2 and Ar gases. The Co/NCNTs composites exhibited superior electrocatalytic performance for tert-butyl hydroquinone (TBHQ) oxidation due to the synergistic effect between chemical composition and the specific structure of Co nanoparticles and nitrogen-doped carbon nanotubes. It was found that the reaction underwent a quasi-reversible redox reaction with 37-fold higher anodic current for TBHQ at Co/NCNT-modified electrode when compared to bare glassy carbon electrode (GCE). In optimal condition, Co/NCNTs/GCE exhibited a linear range of 0.05-80.00 lmolÁL -1 for detecting TBHQ, and the limit of detection (LOD) was estimated to be as low as 10 nmolÁL -1 (signal/noise of S/N = 3). Moreover, the asobtained modified electrode was successfully used to assay the content of TBHQ in edible oil samples.

Ultrafast Potassium Storage in F-Induced Ultra-High Edge-Defective Carbon Nanosheets

“…Potassium-ion batteries (PIBs) have attracted extensive attention for large-scale energy storage systems, mainly because of the low cost and abundant resource of potassium, and they have a similar working principle as both lithium-ion batteries (LIBs) and sodium-ion batteries (NIBs). − The redox potential of the K/K + couple (−2.93 V) is very close to that of Li/Li + (−3.04 V), implying that theoretically PIBs can also achieve a high operating voltage and energy density. − In addition, the solvation radius of K + (0.36 nm) is much smaller than that of both Li + (0.48 nm) and Na + (0.46 nm), resulting in a higher transport number and mobility of K + . − However, it remains an enormous challenge to find suitable electrode materials for PIBs that can accommodate the huge volume expansion during the repeated intercalation/deintercalation of K + . − …”

Core-shell structured Co3O4@PPy composite for electrochemical determination of terbutylhydroquinone

“…Terbutylhydroquinone (TBHQ) is a signicant synthetic antioxidant for preventing oxidative degradation of oil and efficiently scavenging free radicals, thus plays a vital role in the food industry. 1,2 Unfortunately, excessive use of TBHQ leads to cell damage and carcinogenesis. 3,4 Many diseases related to the immune system are associated with excessive TBHQ concentration, such as visual impairment, contact dermatitis, and convulsions.…”

Red room temperature phosphorescence of lead halide based coordination polymer showing efficient angle-dependent polarized emission and photoelectric performance

“…Photoelectric functional materials based on coordination polymers (CPs) or metal–organic frameworks (MOFs) are sought for their tunable structures, fascinating photophysical properties and potential applications in the fields of biological imaging, chemical sensing, photocatalysis, phototherapy, anti-counterfeiting and so on. 1–5 In this field, the huge selection and combination of rich metal ions, organic ligands and guest molecules/ions/nanoparticles enable CPs/MOFs to be a highly versatile and tunable platform for the fabrication of desired functional materials. 6–10 Recently, apart from the widely reported single state CPs/MOFs, studies on the triplet state of these materials have received tremendous attention owing to their fascinating photophysical phenomenon and various applications.…”