A novel electrochemical sensor for capsaicin using mesoporous cellular foams (MCFs) as sensitive material is reported. The high sensitivity of the proposed sensor is attributed to the strong adsorption of capsaicin by mesoporous cellular foams and large surface area of the working electrode resulting from MCFs modification.

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A green strategy for assembling graphene films on various carbon-based substrates and its significant electrocatalytic activity toward nitrite oxidation.

An electrocatalytic platform and electrochemical sensor for nitrobenzene using tetra(4-methoxyphenyl) porphyrin-functionalized N-doped ordered mesoporous carbon (TMPP/N-OMC) as sensitive material is reported. Glassy carbon electrodes modified with TMPP/N-OMC were characterized by scanning electron microscopy, cyclic voltammetry, and electrochemical impedance spectroscopy. The electrode shows high electrocatalytic activity towards the reduction of nitrobenzene in sodium chloride solution (pH 7.00). Electrocatalytic reduction currents of nitrobenzene were found to be linearly related to concentration over the range 0.528 to 132.00 μM with a correlation coefficient of 0.9971 using a differential pulse voltammogram method. The detection limits were determined as 0.2162 μM at a signal-to-noise ratio of 3. The results show TMPP/N-OMC-modified glassy carbon electrodes open new opportunities for fast, simple, and sensitive field analysis of nitrobenzene.