▎ 摘　　要

An electrochemical detection of free chlorine using carbon-metal (C-M) composite powder, with a nickel-metal nanoparticle combined with a multilayered graphene nanoshell (Ni metal@multilayered graphene) as the main component, synthesized from CH4 via multimode microwave-assisted catalytic decomposition, was studied. Morphological analysis of the C-M composite powder was performed by TEM-EDX and Raman spectroscopy. The C-M composite powder was packed in a porous microelectrode (PME), and its electrochemical activity with respect to free chlorine was evaluated using a potential sweep method. The C-M composite powder exhibited a sufficient activity against free chlorine. A current based on the reduction of free chlorine was observed in the potential < around+0.3 V vs. Ag/AgCl. A linear relationship was observed between the current and the concentration.