This study has investigated the oxidation of methanol (CH3OH) on a novel bimetallic Ni–Ti nanoparticle-modified indium tin oxide electrode (Ni–Ti NP/ITO) fabricated by the ion implantation method.

A simple apparatus to measure gas pH and carbon dioxide (CO 2 ) concentration was designed for undergraduate students in the analytical chemistry laboratory. Gas passed through a flow meter and a mixer, then reached the homemade measuring chamber and caused the potential change of a pH combination electrode. Poly(ethylene glycol)-20000 aqueous solutions with hygroscopicity and nontoxicity were used as reaction media by forming absorption liquid films around the junction point and the bulb of the pH combination electrode. A laboratory-made voltage follower and a N2000 chromatography data system were used to transform impedance and record data, respectively. Gas samples containing 10−100% CO 2 were measured with the apparatus, and fast potential responses for different concentrations of CO 2 were obtained. This apparatus is more cost-effective and ecofriendly as compared with other conventional methods.