Co Ion-, NiS2-and CNT-Co-Doped Nanoflower/Hollow Spherical NiO Nanocomposites for Efficient Electrocatalytic Oxidation of Methanol

Nowadays, the development and utilization of clean energy are becoming increasingly urgent. Among them, methanol is a new, clean, and efficient energy source. Therefore, more and more studies are focusing on methanol anodic oxidation (MOR). In this work, nanoflower and hollow spherical NiO was synthesized by a simply hydrothermal method and then modified by Co ion, NiS2 and carbon nanotubes (CNTs). The optimal Co/NiO(f)/NiS2-CNT exhibits flower-like morphology with a larger specific surface area, enlarged electrochemically active surface area and higher conductivity, which improve the electron transfer ability and electrocatalytic activity compared with pure NiO(f), NiO(f)/NiS2, NiO(f)/NiS2-CNT and hollow spherical Co/NiO(hs)/NiS2-CNT. The current density is ultrahigh of 203.46 mA & sdot; cm-2 at 0.8 V, which is 36 times higher than pure NiO(f) and almost 2 times higher than Co/NiO(hs)/NiS2-CNT. Therefore, this work offers a highly efficient and stable NiO based catalyst for methanol oxidation reaction. In this work, nanoflower and hollow spherical NiO was synthesized by a simply hydrothermal method and then modified by Co, NiS2 and carbon nanotubes (CNTs). electrochemical test proves that it has rich Active site, and excellent reaction kinetics. and good stability and conductivity were confirmed by I-t and EIS test. The results showed that the catalyst has good methanol electrocatalytic oxidation activity and the current density could reach 203.46 mA & sdot; cm-2 at a voltage of 0.8 V, catalytic performance surpasses most nickel based materials.image

Automated summary

In this study, nanoflower and hollow spherical NiO were synthesized by a simply hydrothermal method and modified as Co/NiO(f)/NiS2-CNT. The catalyst has a larger specific surface area, enlarged electrochemically active surface area, and higher conductivity, which enhance the electron transfer ability and electrocatalytic activity, making it suitable for methanol oxidation reaction.