Pulse electrocleposited Pd nanoclusters on graphene-based electrodes for proton exchange membrane fuel cells

作者：Hsieh Chien Te^*; Liu Yung Ying; Roy Anup Kumar

来源：Electrochimica Acta, 2012, 64: 205-210.

DOI：10.1016/j.electacta.2012.01.019

• Palladium catalysts
• Fuel cell
• Pulse electrodeposition
• Graphene nanosheets

This study describes a pulse electrodeposition approach for the synthesis of palladium (Pd) nanocatalysts supported on graphene oxide (GO) sheets and their electrocatalytic performance in a single stack of proton exchange membrane fuel cell (PEMFC). Star-like Pd clusters consisting of several nanotips are well deposited over the GO sheets, and the primary size of the cluster ranges from 100 to 150 nm. Cyclic voltammetry (CV) has been adopted to examine the catalytic activity of Pd catalysts in 1 M H2SO4, showing a reversible hydrogen adsorption/desorption. The presence of GO sheets is presumed to render multifunctional roles in facilitating the dispersion of metallic Pd clusters, ionic diffusion, and charge transfer. The PEMFC performance increases with an increase in cell temperature. The single cell delivers the maximal power density of similar to 1.08 kW g(-1) at 70 degrees C and exhibits the apparent activation energy of similar to 27.5 kJ mol(-1) within the temperature region of 40-70 degrees C, according to an estimation of Arrhenius plots.

• 出版日期2012-3-1