Interconnected network of zinc-cobalt layered double hydroxide stick onto rGO/nickel foam for high performance asymmetric supercapacitors

In Situ Formation of Co9S8 Quantum Dots in MOF‐Derived Ternary Metal Layered Double Hydroxide Nanoarrays for High‐Performance Hybrid Supercapacitors

“…The CF@NiCoZn‐LDH/Co 9 S 8 ‐QD//CNS‐SCN full cell delivers a maximum energy density of 56.4 Wh kg −1 at a power density of 875.0 W kg −1 and still reaches 42 Wh kg −1 at a high‐power density of 8200.0 W kg −1 . In addition, the energy storage performance of our devices is obviously better than that of other reported homologous supercapacitors, such as Zn 1 Co 2 ‐LDH@rGO/NF//AC (53.2 Wh kg −1 at 405 W kg −1 ), NiV‐S//AC (51 Wh kg −1 at 1600 W kg −1 ), CSNTs@Ni‐Co LDH NSs//AC (50 Wh kg −1 at 893 W kg −1 ), NiCo‐LDH/PANI/BC//N‐CBC/CC (47.3 Wh kg −1 at 828.9 W kg −1 ), NiCo‐LDH/Co 9 S 8 //CNTs (39 Wh kg −1 at 2400 W kg −1 ), NiAl‐LDH/MnO 2 ‐6//AC (30.4 Wh kg −1 at 789.8 W kg −1 ), NiMn‐LDH/PPy/BC//AC (29.8 Wh kg −1 at 299 W kg −1 ), MnOOH/NiAl‐LDH//AC (26.89 Wh kg −1 at 800 W kg −1 ), rGO@NiMn‐LDH@NF//AC (22.5 Wh kg −1 at 700 W kg −1 ), and CoNi‐LDH//AC (20.38 Wh kg −1 at 800 W kg −1 ) . To verify the practical application, two as‐prepared HSCs devices connected in series can light many 5 mm light‐emitting diodes (LEDs) after a short charge, showing great potential for practical application of hybrid CF@NiCoZn‐LDH/Co 9 S 8 ‐QD//CNS‐SCN devices.…”

Zn–Co Sulfide Microflowers Anchored on Three‐Dimensional Graphene: A High‐Capacitance and Long‐Cycle‐Life Electrode for Asymmetric Supercapacitors

“…In Figure c, the full XPS spectrum of ZnCo 2 (CO 3 ) 1.5 (OH) 3 @ZCS/3DG shows that Zn, Co, S, C, and O elements coexist. The high‐resolution Zn 2p spectrum in Figure d was deconvoluted into two peaks at 1021.5 and 1044.6 eV, corresponding to Zn 2p 3/2 and Zn 2p 1/2 , respectively . The high‐resolution Co 2p spectrum is shown in Figure e. The spin–orbit signal of Co 2p 3/2 is divided into two peaks at 780.3 and 782.0 eV, corresponding to Co 3+ and Co 2+ , respectively.…”

“…The high-resolution Zn 2p spectrum in Figure 3d was deconvoluted into two peaks at 1021.5 and 1044.6 eV,c orresponding to Zn 2p 3/2 and Zn 2p 1/2 ,r espectively. [40] Theh igh-resolution Co 2p spectrum is shown in Figure 3e.T he spin-orbit signal of Co 2p 3/2 is divided into two peaks at 780.3 and 782.0 eV,c orresponding to Co 3 + and Co 2 + , respectively.T he Co 2p 1/2 signal is divided into two peaks at 795.5 and 797.2 eV,c orresponding to Co 3 + and Co 2 + ,r espectively.T he corresponding vibration satellite peaks at 786.3 and 803.1 eV are denoted "Sat." The high-resolution S2 ps pectrum in Figure 3f shows that the S2 p 1/2 peak consists of S2 p 3/2 at 162.4 eV and as atellite peak at 168 eV.…”

Self-Supported Sheets-on-Wire CuO@Ni(OH)2/Zn(OH)2 Nanoarrays for High-Performance Flexible Quasi-Solid-State Supercapacitor

“…The contribution of Zn(OH) 2 was suggested to accelerate the transport of ions, endowing more efficient faradaic processes [44,46,47]. These redox peaks clearly exhibit the battery-type properties of CuO@NiZn.…”