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A conductive carbon paste electrode (CPE) comprised of a new copper-complex of [Cu 2 (Dpq) quinoxaline, Ac ¼ acetate) and carbon powder, was fabricated by the direct mixing method. The electrochemical behavior and electrocatalysis of the new copper-complex modified CPE (Cu-CPE) have been studied in detail. Cyclic voltammograms showed that the Cu-CPE had a favorable electrochemical response of a reversible redox couple of Cu(II)/Cu(I). The Cu-CPE showed good electrocatalytic activity toward the reduction of the bromate, nitrite and hydrogen peroxide. The electrocatalytic reduction peak current of KBrO 3 , KNO 2 and H 2 O 2 showed a linear dependent on their concentrations. All of the results revealed that the Cu-CPE had a good reproducibility, remarkable long term stability and especially good surface renewability by simple mechanical polishing in the event of surface fouling, which is important for practical application.

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The resistance-typed gas sensing material of Pt nanoparticles (PtNPs) decorated reduced graphene oxide (RGO) synthesized by one-step chemical reduction for the detection of four types of SF 6 decompositions was explored. The PtNPs disperse uniformly on RGO with particle size near 2-4 nm and a small number of particles are larger than 10 nm. Gas sensing tests suggest that the introduction of PtNPs increases the response to SO 2 , SOF 2 and H 2 S compared to pure RGO and PtNPs-RGO experiences resistance reducing in SO 2 and SOF 2 while presenting the opposite case in H 2 S. Elevating the temperature enhances the recovery properties to SO 2 and H 2 S but lowers the sensitivity. The sensing mechanism for Pt-RGO in low oxygen and water environment depends mainly on the charge transfer between gas and adsorbent and the solvent on material surface. The work provides experimental investigation of Pt-RGO to detect SF 6 decompositions.

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