Boosting the energy density of supercapacitors by designing both hollow NiO nanoparticles/nitrogen-doped carbon cathode and nitrogen-doped carbon anode from the same precursor

Facile Access to Ni/Co-Based Nanoscale Coordination Polymers for the Boosted Electrochemical Performance of Asymmetric Supercapacitors

“…The values of k 1 and k 2 could be calculated by plotting the slope and y intercept by plotting i v /v 1/2 against v 1/2 , respectively. 65 A typical CV profile is displayed in Figure 5e, which could be classified into capacitance-controlled (blue) and diffusion-confined (purple) contributions. The capacitance-controlled and diffusion-confined contributions to the total capacity are 33.8 and 66.2%, respectively.…”

CNTs support 2D NiMOF nanosheets for asymmetric supercapacitors with high energy density

“…The capacitance of the ASCs device was calculated from its GCD curves using eqn (4), where C s (F g −1 ), Δ V (V) and Δ t (s) represent the specific capacitance, potential window and discharge time of the ASCs device; more importantly, m (g) represents the mass loading of total active materials on the device. The energy density E (W h kg −2 ) and power density P (W kg −2 ) of the ASCs were calculated from the following equations: 24,25 …”

“…The Ragone plots of the NiMOF/CNTs 180//AC and devices previously reported in literature (Fig. 6f and Table S3 †) 6,25,42,48,[51][52][53][54][55][56] reflects the outstanding energy density and power density of NiMOF/CNTs 180//AC, which are significant parameters to effectively evaluate the practical value of asymmetric supercapacitors. Specifically, the maximum energy density of NiMOF/CNTs 180//AC reached 113.8 W h kg −1 at a power density of 800.0 W kg −1 .…”

Dual Redox Active Sites N‐C@Ni2P/NiSe2 Heterostructure Supercapacitor Integrated with Triboelectric Nanogenerator toward Efficient Energy Harvesting and Storage

“…[21,51] The Ragon plot (Figure 5g) compares the relationship between energy density and power density for SASD, previously reported similar devices and different types of energy storage systems (batteries and capacitors). Impressively, the SASD could achieve a high energy density of 60.4 W h kg -1 at a power density of 1598.8 W kg -1 , and still maintain an energy density of 42.1 Wh kg -1 even at a high power density of 7958.8 W kg -1 , which is superior to other similar devices reported in the literature, including Ni x Co 1-x Se 2 /CNFs/CoO//AC (45.0 Wh kg -1 at 800 W kg -1 ), [52] PANI@NiSe 2 //AC (38.3 Wh kg -1 at 308 W kg -1 ), [53] NiCo-P//PANI/rGo (43.4 Wh kg -1 at 620 W kg -1 ), [54] P-(Ni, Co) Se 2 //ZC (45.0 Wh kg -1 at 446.3 W kg -1 ), [55] NiO/NC-700//AC (40.2 Wh kg -1 at 750.2 W kg -1 ), [56] and NiCoP/NiCo-OH//PC (34 Wh kg -1 at 775 W kg -1 ). [57] Furthermore, the CV and GCD of SASD are tested at different bending angles (Figure 5h,i), and it can be seen that the curves are basically overlapping regardless of the bending degree, proving its superior mechanical flexibility.…”