Effect of CeO_2-ZrO_2 on Pt/C electrocatalysts for alcohols oxidation

来源 :Journal of Rare Earths | 被引量 : 0次 | 上传用户:kuaile6789
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The electrocatalytic activity and stability of Pt/C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the alcohols electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction(XRD) and scanning electron microscopy(SEM). The electrochemical properties were measured by a three electrode system on electrochemical workstation(IVIUM). The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that possibly there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles. The electrocatalytic activity and stability of Pt-MO_x/C(M=Ce, Zr) for methanol and ethanol oxidation was better than that of Pt-CeO_2/C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity(OSC). Furthermore, the best performance was found when the molar ratio of CeO_2 to ZrO_2 was 2:1 for the oxidation of methanol and ethanol. The forward peak current density of Pt-MO_x/C(M=Ce, Zr, Ce:Zr=2:1) towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2/C. Pt-MO_x/C(M=Ce, Zr) appeared to be a promising and less expensive methanol oxidation anode catalyst. The electrocatalytic activity and stability of Pt / C catalyst modified by using CeO_2-ZrO_2 mixed oxides for the acrylated electrochemical oxidation as probes were investigated. The catalyst samples were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) electrochemical properties were measured by a three electrode system on electrochemical workstation (IVIUM). The results showed that the presence of CeO_2-ZrO_2 might be associated with the presence of Pt, which indicated that there was synergistic effect between CeO_2-ZrO_2 and Pt nanoparticles . The electrocatalytic activity and stability of Pt-MO_x / C (M = Ce, Zr) for methanol and ethanol oxidation was better than that of Pt-CeO_2 / C, which was attributed to that CeO_2-ZrO_2 composited oxides enhanced oxygen mobility and promoted oxygen storage capacity (OSC). Furthermore, the best performance was found when the molar ratio of CeO 2 to ZrO 2 was 2: 1 for the oxidation of methanol and ethanol. The forwar The peak current density of Pt-MO_x / C (M = Ce, Zr, Ce: Zr = 2: 1) towards the methanol electrooxidation was about 3.8 times that of Pt-CeO_2 / , Zr) to be a promising and less expensive methanol oxidation anode catalyst.
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