Design and Fabrication of Nano-array Architecture for Supercapacitor and Electro-catalytic Reaction

X. Sun
Beijing University of Chemical Technology, CN

Keywords: nanoarray, supercapacitor, electrode, hydrogen evolution reaction, oxygen evolution reaction

Summary:

Nanostructure arrays, offering uniformed size, ordered structure, lower agglomeration and good connection with the substrate, have been proved as advanced and efficient electrodes in electrochemistry. Through a lot of research, our group has found that the specific capacitance, rate capability and cycling life of the electroactive material could be improved significantly by constructing the materials into nano-array structures.1-2 Hierarchical structure nano-array can provide even higher porosity and loaded mass which lead to the enhencement of areal capacitance (~25 F/cm2) and rate capability, while the specific capacitance and cycling stability can be preserved.3-4 More importantly, nano-array architecture also are effective to gas evolution reaction (e.g. oxygen evolution reaction and hydrogen evolution reaction). Besides the above advantages, nano-array architecture can promote the bubble evolution process because of the low adhesion of the surface to the gas bubbles. This observation should be generally applicable for gas evolution reaction.