Electrocatalytic Performance of Palladium Nanoparticle Supported by Two-dimensional Titanium Carbide-CNT Composites

doi:10.15541/jim20170365

Abstract

Abstract:

To improve the layer spacing and the electrocatalytic performance of Ti₃C₂, the carbon nanotubes (CNTs) was utilized to tailor the microstructure. Layered Ti₃C₂, obtained by etching Ti₃AlC₂ with HF, hydroxylated carbon nanotubes (CNTs) and potassium tetrachloropalladate (K₂PdCl₄) were used to synthesize Pd naoparticles supported on Ti₃C₂-CNT (Pd/Ti₃C₂-CNT) catalyst through ultrasonic dispersion and solvothermal method. XRD, FE-SEM and XPS were adopted to investigate the effect of CNT on the microstructural tailoring of Ti₃C₂ interlayers. The electrocatalytic performance of Pd/ Ti₃C₂-CNT catalysts for both formic acid and methanol in acidic and alkaline solutions, were investigated by cyclic voltammetry, chronoamperometry, and AC impedance spectroscopy, respectively. The results validated that the intercalation of CNTs into Ti₃C₂ interlayers, whose “bridge” effects benefit the electron transportation in the catalysts, and thus the electrocatalytic performance of Pd/Ti₃C₂-CNT was elevated.

Key words: direct methanol fuel cell, palladium, CNTs, Ti3C2

CLC Number:

TQ174

ZHANG Xin, ZHANG Jian-Feng, YANG Shui-Xian, CAO Hui-Yang, HUANG Hua-Jie, JIANG Wan. Electrocatalytic Performance of Palladium Nanoparticle Supported by Two-dimensional Titanium Carbide-CNT Composites[J]. Journal of Inorganic Materials, 2018, 33(2): 206-212.

Figures/Tables 8

Fig. 1 SEM images of (a) Ti3C2 and (b) Pd/(Ti3C2)5-(CNT)5 electrocatalysts

Fig. 2 XRD patterns of Ti3C2, Pd/Ti3C2, Pd/Ti3C2-CNT, and Pd/CNT electrocatalysts

Fig. 3 High-resolution (a-c) C1s and (d-f) Pd3d core-level XPS spectra of Pd/CNT, Pd/Ti3C2-CNT and Pd/Ti3C2 electrocatalysts

Fig. 4 High-resolution Ti2p core-level XPS spectra of (a) Pd/Ti3C2-CNT and (b) Pd/Ti3C2 electrocatalysts

Fig. 5 Cyclic voltammetry curves of Pd/Ti3C2-CNT electrocatalysts in (a) 0.5 mol/L H2SO4 and (c) 0.5 mol/L NaOH at 50 mV/s. The corresponding ECSA values were shown in (c) and (d)

Fig. 6 Cyclic voltammetry curves of Pd/Ti3C2-CNT electrocatalysts in (a) 0.5 mol/L H2SO4+0.5 mol/L HCOOH and (c) 0.5 mol/L NaOH+1 mol/L CH3OH at 50 mV/s. The corresponding forward peak current densities were shown in (c) and (d)

Fig. 7 Nyquist plots of EIS for (a) Pd/CNT and (b) Pd/(Ti3C2)5-(CNT)5 electrocatalysts

Fig. 8 Chronoamperometric curves of Pd/Ti3C2-CNT electrocatalysts recorded in (a) 0.5 mol/L H2SO4+0.5 mol/L HCOOH and (b) 0.5 mol/L NaOH+1 mol/L CH3OH solutions

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