Abstract
A three-dimensional hierarchical porous graphene-like (3D HPG) material was synthesized by a one-step ion-exchange/activation combination method using a cheap metal ion exchanged resin as carbon precursor. The 3D HPG material as support for Au-NiCo2O4 gives good activity and stability for oxygen evolution reaction (OER). The 3D HPG material is induced into NiCo2O4 as conductive support to increase the specific area and improve the poor conductivity of NiCo2O4. The activity of and stability of NiCo2O4 significantly are enhanced by a small amount of Au for OER. Au is a highly electronegative metal and acts as an electron adsorbate, which is believed to facilitate to generate and stabilize Co4+ and Ni3+ cations as the active centres for the OER.
Highlights
Long and his cooperators reported that a synergy between the catalytic activity of the FeNi oxide and the enhanced electron transport arising from the graphene results in superior electrocatalytic properties for the OER39
Zhao and coworkers have prepared an active catalyst composed of porous graphene and cobalt oxide (PGE–CoO), which has demonstrated high porosity, large specific surface area and fast charge transport kinetics[37]
We focused on the development of high performance Au/NiCo2O4 catalysts supported on the 3D HPG material for the OER
Summary
The XPS data show that the binding energy value of Ni 2p has a 0.2~0.4 eV positively shift and that of Co 2p has a 1.1~1.6 eV positively shift after loading with Au. Au is a highly electronegative metal and acts as an electron adsorbate, which generates and stabilizes cobalt and nickel ions at higher oxidation states (e.g. Co4+ and Ni3+). The XPS data show that the binding energy value of Ni 2p has a 0.2~0.4 eV positively shift and that of Co 2p has a 1.1~1.6 eV positively shift after loading with Au. Au is a highly electronegative metal and acts as an electron adsorbate, which is believed to facilitate to generate and stabilize Co4+ and Ni3+ cations as the active centres for the OER
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