Controlled synthesis of Co3O4 and Co3O4@MnO2 nanoarchitectures and their electrochemical capacitor application

NiCo2O4 / MnO2 heterostructured nanosheet: influence of preparation conditions on its electrochemical properties

“…We studied the effects of reaction temperature and KMnO4 concentration on their electrode performance for supercapacitors. Contrary to most of the reported results [10,24], our results showed that the loading of MnO2 cannot effectively increase the specific capacitance, but to enhance the cycle ability of the NiCo2O4 / MnO2 electrode when it compared to the pristine NiCo2O4 electrode.…”

“…For example, the A@B structure: NiCo2O4@MnO2 [9,19,20], ZnCo2O4@MnO2 [21], CuCo2O4@MnO2 [22],Co3O4@MnO2 [10,23,24], NiCo2S4@MnO2, [25,26], ZnO2@MnO2 [17], Fe2O3@MnO2 [27], MnO2@MnO2 [28], TiO2@MnO2 [29,30], CuO@MnO2 [31],Co3O4@Au@MnO2 [32], Co3O4@Pt@MnO2 [33], WO3-x@Au@MnO2 [34], MnO2/Mn/MnO2 [35]; the A/B structure: NiCo2O4/MnO2 [36,37], Ni(OH)2/MnO2 [8,13], NiCo2S4/MnO2 [38],…”

Biomass-derived renewable carbon materials for electrochemical energy storage

“…Electrode material lies at the heart of developing highperformance supercapacitors. Carbon-based materials, transition metal oxides/hydroxides and conducting polymers have been regarded as the most promising materials for supercapacitors [84][85][86][87]. It is noteworthy that carbon-based materials, ranging from traditionally ACs to advanced nanostructured carbons (such as graphene and CNTs) have been widely used for supercapacitor electrodes because of their desirable physicochemical properties, such as high specific surface area, excellent chemical stability, eminent electronic conductivity and controllable porosity [88].…”

Co3O4 nanowires@MnO2 nanolayer or nanoflakes core–shell arrays for high-performance supercapacitors: The influence of morphology on performance

“…Although most of the published works have focused on the nano MnO 2 with the flake-like morphology [29,30], the comparisons between MnO 2 nanoflakes and MnO 2 of other nano-morphologies in electrochemical performance are rarely reported. Moreover, the essences of the nanoscaled morphologies influence on the performance of pseudocapacitors are still ambiguous and further investigations are needed to be done.…”

“…The fabrication process of the Co 3 O 4 @Pt@MnO 2 structure reported by Xia et al [32] involved an expensive Platinum sputter-coating process. Yang et al [29] and Huang et al [30] reported a more facile method to prepare the Co 3 O 4 @MnO 2 structure, while the hydrothermal process of high temperature and pressure was still used repeatedly and annealing in the middle of the synthesis process may cause the separation of nanomaterials from substrate. Therefore a simple, low-cost, safe and easily scale-up route to synthesize the core-shell structure and control the morphology is still urgently required.…”