Preparation of Pd-Ag/C@TiO2 Core/shell Nanorods as Catalysts for Electrooxidation of NaBH4†

doi:10.7503/cjcu20150009

Abstract

Abstract:

Pd-Ag/C@TiO₂ core/shell nanorods catalysts were prepared via a thermal evaporation method followed by constant potential electrodeposition. The catalysts were characterized by X-ray diffractometer(XRD), scanning electron microscope(SEM) and transmission electron microscope(TEM). The catalytic performance of the obtained electrodes for NaBH₄ electrooxidation was evaluated by means of linear scan voltammetry and chronoamperometry. The results show that the as-prepared Pd-Ag/C@TiO₂ electrode owns special three dimensional(3D) core/shell structure, which is of benefit to the diffusion of the fuel and the contact between catalyst and fuel during the electrochemical reaction. The performance of Pd-Ag(2∶1)/C@TiO₂ core/shell nanorods with a Pd/Ag atomic ratio of around 0.37∶0.17 is the best, of which a current density of 672 mA/cm² in the solution containing 3.0 mol/L NaOH+0.20 mol/L NaBH₄ was obtained. The chronoamperometric current densities remain nearly constant within a 1200 s test. The results indicate that Pd-Ag(2∶1)/C@TiO₂ core/shell nanorods has considerable electrochemical activity and stability for NaBH₄ electrooxidation.

Key words: Direct borohydride fuel cell, Pd-Ag catalyst, Core/shell nanorods, NaBH4 electrooxidation

CLC Number:

O646
TM911

TrendMD:

YAN Peng, ZHANG Dongming, CHENG Kui, XU Yang, LI Yingying, YE Ke, CAO Dianxue, WANG Guiling. Preparation of Pd-Ag/C@TiO₂ Core/shell Nanorods as Catalysts for Electrooxidation of NaBH₄^†[J]. Chem. J. Chinese Universities, 2015, 36(9): 1801.

Figures/Tables 6

Fig.1 XRD patterns of Ti(a), C@TiO2(b) matrix(A) and Pd-Ag/C@TiO2 nanorods(B, C) in 2θ ranges of 10°—90°(B) and 38.5°—40.1°(C)(B), (C) a. Pd-Ag(0∶1)/C@TiO2; b. Pd-Ag(1∶2)/C@TiO2; c. Pd-Ag(1∶1)/C@TiO2; d. Pd-Ag(2∶1)/C@TiO2; e. Pd-Ag(1∶0)/C@TiO2.

Fig.2 SEM images of C@TiO2 matrix(A) and Pd-Ag/C@TiO2 nanorods(B—F) (B) Pd-Ag(1∶0)/C@TiO2; (C) Pd-Ag(2∶1)/C@TiO2; (D) Pd-Ag(1∶1)/C@TiO2;(E) Pd-Ag(1∶2)/C@TiO2; (F) Pd-Ag(0∶1)/C@TiO2.

Fig.3 TEM image of Pd-Ag(2∶1)/C@TiO2 nanorods(A) and EDX spectra of Pd-Ag(1∶0)/C@TiO2(B), Pd-Ag(2∶1)/C@TiO2(C), Pd-Ag(1∶1)/C@TiO2(D), Pd-Ag(1∶2)/C@TiO2(E) and Pd-Ag(0∶1)/C@TiO2(F)Insets in (B)—(F) show the corresponding elemental distribution of Pd and Ag.

Fig.4 Linear scan voltammograms in 3 mol/L NaOH+0.05 mol/L NaBH4(A) and 3 mol/L NaOH(B) and cyclic voltammograms in 3 mol/L NaOH(C) for Pd-Ag/C@TiO2 nanorodsScan rate: 5 mV/s.

Fig.5 Linear scan voltammograms of Pd-Ag(2∶1)/C@TiO2 nanorods and bare C@TiO2 nanorods(inset) in x mol/L NaBH4+3 mol/L NaOH at 298 K(A) and Pd-Ag(2∶1)/C@TiO2 nanorods in 0.05 mol/L NaBH4+3 mol/L NaOH at different temperatures(B)(A)x: a. 0.05, b. 0.1, c. 0.15, d. 0.2; (B) temperature/K: a. 298, b. 308, c. 318, d. 328.

Fig.6 Chronoamperometric curves for NaBH4 electro oxidation in 3 mol/L NaOH+0.05 mol/L NaBH4 at different potentialsTemperature: 298 K. Potential/V: a. -0.1; b. -0.3; c. -0.5; d. -0.7.

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Preparation of Pd-Ag/C@TiO₂ Core/shell Nanorods as Catalysts for Electrooxidation of NaBH₄^†

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