Attractive nanofiber structure based on Cu-Ti/metal sandwich film with excellent electrocatalytic performance for ethanol oxidation

doi:10.1016/j.jmst.2020.03.062

Abstract

Abstract:

The support materials are an important part of catalysts and they are the dispersant, adhesive, and support for other components. In this study, three types of thin films with different structures were used as the precursor to prepare loading Pd catalysts. The one-step dealloying method was used to prepare a semiconductor nanofiber film (NFF) support material with upward directional growth from the substrate. Pd/NFF and Pd/NiO/NFF loaded Pd catalysts were prepared using NFF as the support material, and the electrochemical catalytic properties for ethanol oxidation in alkaline media were studied. Cyclic votammetry showed that the NFF support material effectively inhibited agglomeration of palladium, increased the number of active sites of Pd, and improved the electrocatalytic properties of Pd for ethanol oxidation. In addition, the Pd/NiO/NFF loaded Pd catalyst obtained by modification with nickel oxide significantly improved the electrocatalytic performance for ethanol oxidation compared with the Pd/NFF loaded Pd catalyst. These results show that NiO is conductive to absorption of oxygen-containing groups on the surface of the catalyst and can further improve the electrocatalytic ability of Pd for ethanol oxidation. All of the above results demonstrate that the support material prepared by the dealloying method has application prospects in load-type catalysts.

Key words: Dealloying, Support material, Load-type catalyst, Pd/NFF, Pd/NiO/NFF

Qingzhuo Hu, Fabao Zhang, Jinjun Zhang, Wei Jiang, Bo Zhang. Attractive nanofiber structure based on Cu-Ti/metal sandwich film with excellent electrocatalytic performance for ethanol oxidation[J]. J. Mater. Sci. Technol., 2020, 58: 215-221.

Figures/Tables 8

Fig. 1. FESEM surface and cross-section morphologies of three support films prepared by dealloying: (a, b) Cu-Ti amorphous alloy thin film precursor; (c, d) Cu-Ti/Ti sandwich multilayer film precursor; (e, f) Cu-Ti/Cu sandwich multilayer film precursor.

Fig. 2. (a) Dealloying process and forming the nanofibrous structural material for directional growth, (b) the sedimentary cross-section morphology diagram of Cu-Ti/Cu sandwich multilayer films, (c) Ti atoms removed and Cu atoms rearranged to form a skeleton connected from the substrate upwards between the multilayer films and (d) precipitate and growth of TiO2 on the connected skeletons.

Fig. 3. FESEM patterns of Pd/NiO/NFF: (a) surface morphology; (b) cross-section morphology.

Fig. 4. XRD pattern of Pd/NiO/NFF.

Fig. 5. XPS patterns of (a) Ni 2p and (b) Pd 3d of Pd/NiO/NFF.

Fig. 6. (a) TEM image, (b) HRTEM image, (c) SAED pattern and (d) EDX mapping of Pd/NiO/NFF.

Fig. 7. CV curves of (a) Pd/NFF catalyst in 1.0 M KOH solution containing 1.0 M ethanol and (b) Pd/NiO/NFF catalyst in 1.0 M KOH solution in the presence of different concentrations of ethanol (0.5, 1.0, 5.0 and 10.0 M) at scan rate 100 mV s-1.

Fig. 8. Chronoamperometry curves curves of Pd/NiO/NFF catalyst in 1.0 M KOH solution in the presence of different concentrations of and ethanol (0.5, 1.0, 5.0 and 10.0 M).

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