Low-crystalline birnessite-MnO2 nanograins for high-performance supercapacitors

Compositing redox-rich Co–Co@Ni–Fe PBA nanocubes into cauliflower-like conducting polypyrrole as an electrode material in supercapacitors

“…The transition range from 0.5 to 1 indicates the change from the diffusion-controlled reaction to the capacitive type (surface-controlled reaction). 5,16,55,56…”

“…The transition range from 0.5 to 1 indicates the change from the diffusion-controlled reaction to the capacitive type (surface-controlled reaction). 5,16,55,56 From Fig. 5(a), the derived b values of the Co-Co@Ni-Fe PBA-PPy composite were 0.6443 and 0.6440, corresponding to the anodic and cathodic peaks, respectively, showing the co-existence of capacitive and diffusion-controlled contributions to the energy storage mechanism.…”

Zeolitic Imidazole Framework Sacrificial Template-Assisted Synthesis of NiCoP Nanocages Doped with Multiple Metals for High-Performance Hybrid Supercapacitors

“…A b -value close to 1 indicates that the energy storage mechanism of the electrode is a capacity-dominated process, whereas a b -value close to 0.5 represents a diffusion-controlled process . The b -value for AlCu-NiCoP was calculated to be 0.74, which shows that both the diffusion-controlled process and the capacitive process play an important role. , The energy storage mechanism of AlCu-NiCoP was also investigated by the following equation where k 1 v denotes the stored charge derived from the surface capacitive contribution and k 2 v 1/2 indicates the stored charge derived from the diffusion-controlled process. …”

“…54 The b-value for AlCu-NiCoP was calculated to be 0.74, which shows that both the diffusion-controlled process and the capacitive process play an important role. 55,56 The energy storage mechanism of AlCu-NiCoP was also investigated by the following equation…”

Three-dimensional nano-folded transition-metal oxide electrode materials for high-performing electrochemical energy-storage devices

“…[1][2][3][4][5] As an essential and promising electrode material for energy-storage devices, transition-metal oxides show great potential due to their versatile redox reactions that occur between different valence states (e.g., Mn 3+ /Mn 4+ in the MnO 2 -based electrode), leading to a considerable capacity performance and energy density. [6][7][8][9] So far, the significant development of nanoscience and nanotechnology has driven the improvement of electrochemical performance in transition-metal oxide-based electrodes via rational design on the material properties and structures. 5,[10][11][12][13] Compared with the bulk counterparts, well-defined transitionmetal oxides with a particle size/length ranging from several nanometers to hundreds of nanometers possess substantially large specific surface areas for electrolyte-ion absorption, which ensures a fast surface redox reaction and effectively reduces the ion-transport distance during electrochemical charge/discharge processes.…”