Preparation of Phosphotungstic Acid-modified Carbon Supported Pd Catalyst and Its Electrocatalytic Performance for Formic Acid Oxidation†

doi:10.7503/cjcu20130469

Abstract

Abstract:

Activated carbon was modified with phosphotungstic acid(PWA) at 80 ℃ in a water bath, Pd was then loaded on the PWA/C hybrid support to prepare Pd-PWA/C catalyst by a simple impregnation-reduction method. The measurements of energy dispersive X-ray spectroscopy(EDS), X-ray diffraction(XRD) pattern, transmission electron microscopy(TEM) and X-ray photoelectron spectroscopy(XPS) indicate that phosphotungstic acid-modified carbon not only decreases the average size of Pd nanoparticles effectively but also interacts with Pd nanoparticles strongly. The electrochemical measurements demonstrate that the electrocataly-tic activity and stability of the Pd-PWA/C catalyst for formic acid oxidation are much better than that of the Pd/C catalyst. It is due to that the strong interaction between Pd and PWA/C not only decreases the adsorption strength and amount of CO at the catalyst electrode but also decreases the decomposition rate of formic acid to decrease the CO poisoning.

Key words: Pd catalyst, Phosphotungstic acid, Formic acid oxidation, Decomposition of formic acid

CLC Number:

O646

TrendMD:

LU Liang, CHEN Tingting, GE Cunwang, TANG Yawen, CHEN Yu, LU Tianhong. Preparation of Phosphotungstic Acid-modified Carbon Supported Pd Catalyst and Its Electrocatalytic Performance for Formic Acid Oxidation^†[J]. Chem. J. Chinese Universities, 2014, 35(1): 115.

Figures/Tables 10

Fig.1 EDS spectra of the PWA/C(A) and Pd-PWA/C(B) catalysts

Fig.2 XRD patterns of the PWA(a), PWA/C(b)(A) and Pd/C(a), Pd-PWA/C(b)(B) catalysts

Fig.3 TEM images(A, C) and corresponding particle size distribution histograms(B, D) of the Pd/C(A, B) and Pd-PWA/C(C, D) catalysts

Fig.4 XPS spectra of Pd3d(A) in the Pd/C(a) and Pd-PWA/C(b) catalysts and W4f(B) in the PWA/C(a) and Pd-PWA/C(b) catalysts

Fig.5 Cyclic voltammograms of 0.5 mol/L H2SO4 solution at the PWA/C(a), Pd/C(b) and Pd-PWA/C(c) catalyst electrodes with a scan rate of 50 mV/s

Fig.6 Cyclic voltammograms of 0.5 mol/L formic acid in 0.5 mol/L H2SO4 solution at the PWA/C(a), Pd/C(b) and Pd-PWA/C(c) catalyst electrodes with a scan rate of 50 mV/s

Fig.7 Chronoamperometric curves of 0.5 mol/L HCOOH in 0.5 mol/L H2SO4 solution at the Pd/C(a) and Pd-PWA/C(b) catalyst electrodes at 0.15 V

Fig.8 Current density vs. cycle numbers curves for the cyclic voltammgrams of 0.5 mol/L HCOOH in 0.5 mol/L H2SO4 solution at the Pd/C(a) and Pd-PWA/C(b) catalyst electrodes with a scan rate of 50 mV/s

Fig.9 Cyclic voltammograms of the adsorbed CO in 0.5 mol/L H2SO4 solution at the Pd/C(a) and Pd-PWA/C(b) catalyst electrodes with a scan rate of 10 mV/s

Fig.10 Relationship between time and the gas vo-lume produced from the catalytic decomposition of HCOOH over the PWA/C(a), Pd-PWA/C(b) and Pd/C(c) catalysts in 0.5 mol/L HCOOH and 0.5 mol/L H2SO4 solution

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