Performance of WO3 Modified Graphene Supported Pd Nanocatalysts for Formic Acid Electro-oxidation†

doi:10.7503/cjcu20160692

Abstract

Abstract:

The composites WO₃-GO were prepared by the modification of WO₃ crystal particles onto the surface of graphene oxide(GO), Pd/WO₃-RGO catalysts were prepared by using potassium borohydride as the reducing agent. The performances of the catalysts and the effect of different contents of WO₃ on the catalytic activity were investigated. The Pd/WO₃-RGO catalysts showed significantly enhanced electrocatalytic performances for formic acid oxidation. The peak current density on the best catalyst Pd/20%WO₃-RGO catalyst was 2.5 times that on Pd/RGO catalyst. And more importantly, Pd/WO₃-RGO catalysts showed improved stability and excellent tolerance to CO poisoning. According to XRD, TEM and HRTEM results, Pd/WO₃-RGO catalysts are made of monoclinic WO₃, face centered cubic palladium crystal particles and graphene. WO₃ particles are most likely to be covered or overlapped with Pd particles and Pd nanoparticles have a uniform distribution. The enhanced catalytic activity of Pd/WO₃-RGO can be ascribed to the interaction between Pd and WO₃.

Key words: Direct formic acid fuel cell, Tungsten trioxide, Electro-catalysis, Graphene

CLC Number:

O646.5

TrendMD:

JIN Yanxian, JIA Wenping, LIANG Danxia, LI Fang, LI Rongrong, ZHENG Mengmeng, GAO Weiyi, NI Jiamin, HU Jiajie, WU Tinghua. Performance of WO₃ Modified Graphene Supported Pd Nanocatalysts for Formic Acid Electro-oxidation^†[J]. Chem. J. Chinese Universities, 2017, 38(4): 653.

Figures/Tables 6

Fig.1 XRD patterns of Pd/WO3-RGO with different contents of WO3 and Pd/RGO samplesa. GO; b. 10%WO3-GO; c. 20%WO3-GO; d. 30%WO3-GO; e. Pd/10%WO3-RGO; f. Pd/20%WO3-RGO; g. Pd/30%WO3-RGO; h. Pd/RGO.

Fig.2 TEM(A) and HRTEM(B) images, particle size histogram(C) and EDX spectrum(D) of Pd/20%WO3-RGO

Fig.3 Cyclic voltammograms in 0.5 mol/L H2SO4 solution for Pd/WO3-RGO and Pd/RGO electrodesa. Pd/10%WO3-RGO; b. Pd/20%WO3-RGO; c. Pd/30%WO3-RGO; d. Pd/RGO; e. 20%WO3-GO. Scan rate: 50 mV/s.

Fig.4 Cyclic voltammograms in 0.5 mol/L H2SO4+1 mol/L HCOOH solution for Pd/WO3-RGO and Pd/RGO electrodesa. Pd/10%WO3-RGO; b. Pd/20%WO3-RGO; c. Pd/30%WO3-RGO; d. Pd/RGO; e. 20%WO3-GO. f. Pd/15%WO3-RGO; g. Pd/25%WO3-RGO. Scan rate: 50 mV/s.

Fig.5 Chronoamperometric curves at 0.4 V(A) and galvanostatic polarization curves(B) at 4.8 mA/cm2 current density on Pd/WO3-RGO and Pd/RGO electrodes in 0.5 mol/L H2SO4+1 mol/L HCOOH

Fig.6 CO stripping cyclic voltammograms on Pd/20%WO3-RGO(a) and Pd/RGO(b) electrodes in 0.5 mol/L H2SO4 with a scan rate of 50 mV/s

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Performance of WO₃ Modified Graphene Supported Pd Nanocatalysts for Formic Acid Electro-oxidation^†

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