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

Abstract 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, NiS 2 and carbon nanotubes (CNTs). The optimal Co/NiO(f)/NiS 2 −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)/NiS 2 , NiO(f)/NiS 2 −CNT and hollow spherical Co/NiO(hs)/NiS 2 −CNT. The current density is ultrahigh of 203.46 mA ⋅ cm −2 at 0.8 V, which is 36 times higher than pure NiO(f) and almost 2 times higher than Co/NiO(hs)/NiS 2 −CNT. Therefore, this work offers a highly efficient and stable NiO based catalyst for methanol oxidation reaction.