One-step construction of three-dimensional nickel sulfide-embedded carbon matrix for sodium-ion batteries and hybrid capacitors

Nickel cobalt oxide nanowires‐modified hollow carbon tubular bundles for high‐performance sodium‐ion hybrid capacitors

“…The b values of the corresponding cathodic and anodic peaks are 0.69 and 0.61 (Figure 3E), revealing the prominent role of capacitive contribution for sodium storage mechanism in the total charge storage . Accordingly, pseudocapacitive contributions are calculated to be 56.2%, 66.1%, 76.4%, 80.3%, and 84.5% at the scan rates of 0.2, 0.5, 0.8, 1.1, and 1.4 mV s −1 , respectively (Figure S4), indicating that the increasing scan rates may mainly result from the Na + intercalation into the NiCo 2 O 4 /CTBs composite (Figure S6) . The cycle performances of the materials are exhibited in Figure 3F, presenting that the 92% capacity retention is achieved after 500 cycles, which is higher than that of the bare NiCo 2 O 4 (50% capacity retention) and the mixture of NiCo 2 O 4 and CTBs (56% capacity retention) (Figure S4E).…”

“…41 Accordingly, pseudocapacitive contributions are calculated to be 56.2%, 66.1%, 76.4%, 80.3%, and 84.5% at the scan rates of 0.2, 0.5, 0.8, 1.1, and 1.4 mV s −1 , respectively ( Figure S4), indicating that the increasing scan rates may mainly result from the Na + intercalation into the NiCo 2 O 4 /CTBs composite ( Figure S6). 42 The cycle performances of the materials are exhibited in Figure 3F, presenting that the 92% capacity retention is achieved after 500 cycles, which is higher than that of the bare NiCo 2 O 4 (50% capacity retention) Figure 4A, while the computational details can be found in the Supplementary information. For carbon, pure C─C bond is commonly considered to be strong and hard to be break, which is unfavorable for the anchoring of metal oxide particles on its surface ( Figure 4B).…”

Recent advances in carbon-based supercapacitors

“…Battery-capacitor hybrid devices combine capacitive carbon and battery-type electrodes, exhibiting energy storage close to those of batteries and power output approximately that of supercapacitors. 7,[151][152][153][154] Nevertheless, battery-type materials generally exhibit limited kinetics during redox reactions rooted from the sluggish phase transformation rate. 8 Wang's group synthesized and employed hierarchical porous carbon nanosheets and MnO@C nanocomposites as the positive and negative electrodes for Li-ion hybrid capacitors with kapok fiber as the precursor.…”

Progress and Prospects of Transition Metal Sulfides for Sodium Storage

“…Generally, this can be achieved by using of sodium-ion intercalation materials as one of the electrodes, along with battery materials as the opposite electrode. Qu et al constructed and tested a coin-type SIHC device consisting the as-prepared NiS x @ PCM anode and an activated carbon cathode [97]. Figure 15a shows the operation principle of the SIHC.…”

“…c Galvanostatic charge/discharge profiles of the SIHC at various rates. d Rate performance of the SIHC at various current densities [97]. e The charge/discharge profiles of the Co 9 S 8 @ NC//CG SIHC at various rates.…”