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Copper sulfide nanospheres (CuS NS) were prepared by a solvothermal method with the support of p-phenylene diamine as a structure direct agent. The formation of CuS NS was evaluated using XRD, FE-SEM, HR-TEM, XPS, and electrochemical methods. The CuS NS modified electrode demonstrated excellent electro-catalytic behavior for the electro-oxidation of oxalic acid (OA). The modified electrode showed a good linear range (50 to 700 μM), high sensitivity (0.0353 μA μM -1 cm -2 ), a low detection limit (35.6 μM), long term stability and good anti-interference behavior.

Electrochemical Enzyme-free Sensing of Oxalic Acid Using an Amine-mediated Synthesis of CuS Nanosphere