Chinese Journal of Catalysis ›› 2017, Vol. 38 ›› Issue (5): 939-947.DOI: 10.1016/S1872-2067(17)62834-1

• Articles • Previous Articles    

Enhancement of the formic acid electrooxidation activity of palladium using graphene/carbon black binary carbon supports

Meiying Lv, Wenpeng Li, Huiling Liu, Wenjuan Wen, Guang Dong, Jinghua Liu, Kaichen Peng   

  1. Institute of Advanced Energy Materials and Chemistry, Key Lab of Fine Chemicals in Universities of Shandong, School of Chemistry and Pharmaceutical Engineering, Qilu University of Technology, Jinan 250353, Shandong, China
  • Received:2016-12-25 Revised:2017-04-06 Online:2017-05-18 Published:2017-05-10
  • Supported by:

    This work was supported by the Natural Science Foundation of Shandong Province (ZR2016BM31), the Science and Technology Foundation of Jinan City (201311035).

Abstract:

Combinations of graphene (Gr) and carbon black (C) were employed as binary carbon supports to fabricate Pd-based electrocatalysts via one-pot co-reduction with Pd2+. The electrocatalytic performance of the resulting Pd/Gr-C catalysts during the electrooxidation of formic acid was assessed. A Pd/Gr0.3C0.7 (Gr oxide:C = 3:7, based on the precursor mass ratio) electrocatalyst exhibited better catalytic performance than both Pd/C and Pd/Gr catalysts. The current density generated by the Pd/Gr0.3C0.7 catalyst was as high as 102.14 mA mgPd-1, a value that is approximately 3 times that obtained from the Pd/C (34.40 mA mgPd-1) and 2.6 times that of the Pd/Gr material (38.50 mA mgPd-1). The anodic peak potential of the Pd/Gr0.3C0.7 was 120 mV more negative than that of the Pd/C and 70 mV more negative than that of the Pd/Gr. Scanning electron microscopy images indicated that the spherical C particles accumulated on the wrinkled graphene surfaces to form C cluster/Gr hybrids having three-dimensional nanostructures. X-ray photoelectron spectroscopy data confirmed the interaction between the Pd metal and the binary Gr-C support. The Pd/Gr0.3C0.7 also exhibited high stability, and so is a promising candidate for the fabrication of anodes for direct formic acid fuel cells. This work demonstrates a simple and cost-effective method for improving the performance of Pd-based electrocatalysts, which should have potential industrial applications.

Key words: Binary carbon support, Palladium, Graphene, Carbon black, Formic acid oxidation, Fuel cell