Morphology-dependent NiMoO4/carbon composites for high performance supercapacitors

Publication date: Available online 9 November 2019Source: Inorganic Chemistry CommunicationsAuthor(s): Yong Zhang, Cui-rong Chang, Xiao-dong Jia, Qing-yuan Huo, Hai-li Gao, Ji Yan, Ai-qin Zhang, Yi Ru, Han-xin Mei, Ke-zheng Gao, Li-zhen WangAbstractIn order to improve the capacitive performance of supercapacitors, NiMoO4 electrode materials were successfully prepared by a simple and safe solvent-thermal method, and the morphology, microstructure and properties of the materials were successfully optimized by adding reduced graphene oxide (rGO) and multiwalled carbon nanotubes (MWCNTs). The morphology, structure and electrochemical properties of the as-prepared samples were investigated by SEM, XRD, laser particle size, cyclic voltammetry (CV), galvanostatic charge/discharge (GCD) and electrochemical impedance spectroscopy (EIS). The results showed that the addition of rGO and MWCNTs could greatly affect the morphology and capacitance properties of NiMoO4. The mixed characteristics of pine needle-like and microspheres NiMoO4 gradually changes into honeycomb structure of NiMoO4/rGO after the addition of rGO, while the NiMoO4/MWCNTs shows the mixed characteristics of honeycomb and microrod-like. In addition, compared with pure NiMoO4 and NiMoO4/rGO, the NiMoO4/MWCNTs shows more uniform particle size distribution, more active sites, smaller charge transfer resistance and higher ionic diffusion coefficient, thus exhibiting better supercapacitance performance. Under the current dens...
Source: Inorganic Chemistry Communications - Category: Chemistry Source Type: research