Facile Preparation of Amino-modified Pd/TiO2/C Nanocatalyst and Its Electrocatalytic Performance for Ethanol Oxidation in Alkaline Solution†

doi:10.7503/cjcu20140931

Abstract

Abstract:

A hybrid material consisting of Vulcan XC-72 carbon and TiO₂ nanosheet was fabricated as the support of Pd nanocatalysts. TiO₂ nanosheets were prepared by hydrothermal method with tetrabutyl titanate as a precursor, and then modified by 3-aminopropyltrimethoxysilane(APTMS) solution, which serves as a rivet to anchor Pd²⁺. Pd/TiO₂/C nanocatalyst was obtained by the reduction of NaBH₄. The morphology, composition and structure of the as-prepared Pd/TiO₂/C-APTMS were investigated by transmission electron microscopy(TEM), energy dispersive X-ray spectroscopy(EDS), inductively coupled plasma-atomic emission spectroscopy(ICP-AES), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The electrochemical measurement revealed that Pd/TiO₂/C-APTMS catalyst exhibited higher electrocatalytic activity and stability for ethanol electrooxidation(EOR) in alkaline media as compared to Pd/C and Pd/TiO₂/C catalysts prepared by traditional liquid phase reducing method without APTMS modification. The enhanced activity and durability of Pd/TiO₂/C-APTMs catalyst could be ascribed to the improved dispersion and stabilization of Pd nanoparticles on TiO₂ nanosheet, as well as the electronic structure modificaiton induced by APTMS.

Key words: Surface modification, Carbon-titanium dioxide hybrid support, Palladium nanocatalyst, Ethanol oxidation, Electrocatalytic performance

CLC Number:

O646

TrendMD:

CAO Xiaolu, WANG Longlong, WANG Yajun, XU Qunjie, LI Qiaoxia. Facile Preparation of Amino-modified Pd/TiO₂/C Nanocatalyst and Its Electrocatalytic Performance for Ethanol Oxidation in Alkaline Solution^†[J]. Chem. J. Chinese Universities, 2015, 36(6): 1187.

Figures/Tables 7

Fig.1 TEM images of Pd/C(A), Pd/TiO2/C(B) and Pd/TiO2/C-APTMS(C) catalysts and HRTEM image of Pd/TiO2/C-APTMS catalyst(D)

Fig.2 Size distribution diagrams of Pd/C(A), Pd/TiO2/C(B) and Pd/TiO2/C-APTMS(C) catalysts

Fig.3 EDS spectra of Pd/C(A), Pd/TiO2/C(B) and Pd/TiO2/C-APTMS(C) catalysts

Fig.4 XRD patterns of Pd/C(a), Pd/TiO2/C(b), Pd/TiO2/C-APTMS(c) catalysts and TiO2 nanosheets(d)

Fig.5 Survey scan XPS spectra(A, B) and Pd3d XPS spectra(C, D) of Pd/TiO2(A, C) and Pd/TiO2/C-APTMS(B, D) catalysts

Fig.6 Cyclic voltammograms on Pd/C(a), Pd/TiO2/C(b) and Pd/TiO2/C-APTMS(c) catalysts in 1.0 mol/L NaOH solution at a scan rate of 50 mV/s

Fig.7 Cyclic voltammograms on Pd/C(a), Pd/TiO2/C(b) and Pd/TiO2/C-APTMS(c) catalysts in 1.0 mol/L NaOH+1.0 mol/L H3CH2OH solution at a scan rate of 50 mV/s(A) and corresponding chronoamperometric i-t curves at -0.2 V(B)

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Facile Preparation of Amino-modified Pd/TiO₂/C Nanocatalyst and Its Electrocatalytic Performance for Ethanol Oxidation in Alkaline Solution^†

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