Fabrication and Electrocatalytic Performance of Graphene-fullerene Ammonium Iodide Composite Supported Pd Nanocatalyst for Ethanol Oxidation†

doi:10.7503/cjcu20180708

Abstract

Abstract:

Reduced graphene oxide/[6,6]-phenyl-C61-butyric acid trimethylaminoethyl ester iodide hybrid composites(RGO-PCBANI) were used to support Pd nanoparticle to fabricate Pd/RGO-PCBANI electrocatalysts on electrode. The morphology and structure of the RGO-PCBANI and Pd/RGO-PCBANI were characterized by scanning electron microscopy(SEM), transmission electron microscopy(TEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). Furthermore, the electrocatalytic performance of Pd/RGO-PCBANI towards ethanol oxidation was evaluated by using electrochemical methods such as cyclic voltammetry and chronoamperometry. The results showed that the prepared RGO-PCBANI(6∶1) support displayed good dispersibility and could immobilize Pd nanoparticle with 5.2 nm average size. Moreover, the fabricated Pd/RGO-PCBANI(6∶1) catalyst exhibited best catalyst activity and stability. The mass current density reached 1288. 8 mA/mg. The good catalytic performance is attributed to highly conductive PCBANI’s spacer function in the RGO-PCBANI composite support.

Key words: Graphene-fullerene hybrid composite, Spacer material, Palladium electrocatalyst, Fuel cell, Ethanol oxidation

CLC Number:

O646

TrendMD:

LIN Zhouchen,HUANG Qiaoxi,LEI Ming. Fabrication and Electrocatalytic Performance of Graphene-fullerene Ammonium Iodide Composite Supported Pd Nanocatalyst for Ethanol Oxidation^†[J]. Chem. J. Chinese Universities, 2019, 40(5): 1013.

Figures/Tables 9

Fig.1 Preparation of graphene-fullerene ammonium iodide composite

Fig.2 Dispersion of carbon materials in ethanola. RGO-PCBANI(4∶1); b. RGO-PCBANI(6∶1); c. RGO-PCBANI(8∶1); d. RGO.

Fig.3 SEM images of the RGO(A), RGO-PCBANI(8∶1)(B), RGO-PCBANI(6∶1)(C) and RGO-PCBANI(4∶1)(D)

Fig.4 XRD patterns of RGO-PCBANI(6∶1)(a) and GO(b)

Fig.5 XPS of Pd3d in Pd/RGO-PCBANI(6∶1)

Fig.6 Low-magnification TEM images(A1, B1), high-resolution TEM images(A2, B2) and size distributions(A3, B3) of Pd/RGO(A1—A3) and Pd/RGO-PCBANI(6∶1)(B1—B3)Insets in (A1), (B1) display the selected area electron diffraction(SAED) images.

Fig.7 Cyclic voltammograms of ethanol oxidation on Pd/RGO-PCBANI, Pd/RGO and commercial Pd/C in 0.5 mol/L C2H5OH+1.0 mol/L KOH at a scan rate of 50 mV/s

Table 1 Electrocatalytic performance of catalysts

Catalyst	Peak current/(mA·mg^-1)	Nonfaraday current/(mA·mg^-1)	Mass activity/(mA·mg^-1)
Pd/RGO-PCBANI(4∶1)	1235.6	297.7	937.9
Pd/RGO-PCBANI(6∶1)	1800.8	512.0	1288.8
Pd/RGO-PCBANI(8∶1)	843.5	167.2	676.3
Pd/RGO	1158.6	226.0	932.6
Commercial Pd/C	554.9	112.0	442.9

Fig.8 Chronoamperometry curves of ethanol oxidation on Pd/RGO-PCBANI, Pd/RGO and commercial Pd/C in 0.5 mol/L C2H5OH + 1.0 mol/L KOH at a potential of -0.35 V

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