The morphology effect of cerium oxide (CeO) has always been the focus of catalysis research. Few people have reported the relationship between the morphology of CeO and electrochemical performance in sensors. In this paper, a polyaniline (PANI) matrix is used as the dispersant and stabilizer, ultrafine Au nanoparticles (NPs) (Au@PANI) are uniformly embedded in the PANI matrix, and Au NPs@PANI is fixed on the surface of CeO with different morphologies and sizes (Spindle CeO:(SCe), octahedron CeO (OCe)). The morphology and crystal structure of CeO were adjusted under different ratios of ethanol and water, and the effect of CeO was evaluated. The synthesized CeO-Au@PANI has different morphologies, sizes, and electrochemical properties. The electrochemical catalytic behavior of CeO-Au@PANI was studied by using hydrogen peroxide (HO) as the reaction substrate. The instantaneous current method (-) was used to further study the electrochemical amplification effect, and the best performance was obtained.
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