Abstract:
The strong affinity of palladium (Pd) towards hydrogen is the
main challenge for hydrogen desorption application. Therefore,
in this report, we synthesized nickel, copper, and cobalt core
and palladium shell nanostructure supported on nitrogen,
sulfur-doped reduced graphene oxide (M@Pd/N, S-rGO, M=Ni,
Cu, Co) by hydrothermal method followed by reduction of the
metal nanoparticles using modified polyol method. Using X-ray
diffraction (XRD), Raman spectroscopy, High resolution trans mission electron microscope (HRTEM), Field emission scanning
electron microscope (FESEM), and X-ray photoelectron spectro scopy (XPS), the physicochemical properties of the synthesized
sample was investigated. The results confirm strong interac tions between M@Pd and higher surface area support that
could enhance electrocatalytic activity towards hydrogen
evolution reaction (HER) and oxygen evolution reaction (OER).
Among the synthesized electrocatalyst, Ni@Pd/N,S-rGO exhibits
higher electrocatalytic activity with small over potential 0.035 V
and 0.2 V at 10 mA/cm2 and a Tafel slope value of 39 mVdec
