Multi-scale biomass-based carbon microtubes decorated with Ni-Co sulphides nanoparticles for supercapacitors with high rate performance

NiCo2S4‐Based Composite Materials for Supercapacitors

“…A hybrid supercapacitor based on NiCo 2 S 4 @NCNT and activated carbon delivered an energy density of 49.75 W h kg −1 at a power density of 774.65 W kg −1 , and a capacitance retention ratio of 88.9 % after 3000 charge‐discharge cycles. Some other carbon materials with different morphologies have also been reported for the construction of NiCo 2 S 4 /carbon composites, such as NiCo 2 S 4 coated activated carbon, biomass‐based carbon microtubes decorated with NiCo 2 S 4 nanoparticles, carbon flakes@NiCo 2 S 4 nanosheets and carbon sponge@NiCo 2 S 4 nanoparticles …”

Rational Design of Porous Structured Nickel Manganese Sulfides Hexagonal Sheets‐in‐Cage Structures as an Advanced Electrode Material for High‐Performance Electrochemical Capacitors

“…Even at a high discharge current of 20 A g −1 , the energy density could reach ≈19.6 Wh kg −1 at a high‐power density of 15 kW kg −1 . The energy and power densities for the proposed devise are highly competitive with those obtained by previously reported asymmetric capacitor devices established with earth‐abundant elements and carbon materials as the positive and negative electrodes, respectively, such as α‐MnS/N‐rGO//N‐rGO (27.7 Wh kg −1 at 800 W kg −1 and 16.1 Wh kg −1 at 20 kW kg −1 ), Ni‐Mn sulfides//RGO (36 Wh kg −1 at 775 W kg −1 and 16.9 Wh kg −1 at 15.5 kW kg −1 ), Ni 0.67 Co 0.33 MoO 4 //RGO (25.6 Wh kg −1 at 775 W kg −1 and 13.2 Wh kg −1 at 7.75 kW kg −1 ), NiCo 2 S 4 @NiCo 2 S 4 //rGO (24.9 Wh kg −1 at 334 W kg −1 and 12.6 Wh kg −1 at 2.44 kW kg −1 ), Co 2.5 Mn 0.5 sulfide//RGO (22.3 Wh kg −1 at 750 W kg −1 and 11 Wh kg −1 at 30 kW kg −1 ) NiS 2 //rGO (32.76 Wh kg −1 at 954 W kg −1 and 11.19 Wh kg −1 at 1.35 kW kg −1 ), CMTs‐1000/Ni 2 CoS 4 //AC (28.1 Wh kg −1 at 753 W kg −1 and 17.7 Wh kg − , at 17.2 kW kg −1 ), MnO 2 //Bi 2 O 3 (11.3 Wh kg −1 at 352.6 W kg −1 and 9.1 Wh kg −1 at 3.37 kW kg −1 ), K 0.27 MnO 2 ⋅ 0.6 H 2 O//AC (25.3 Wh kg −1 at 140 W kg −1 and 17.6 Wh kg −1 at 2.0 kW kg −1 ), PB@MnO 2 //PG (16.5 Wh kg −1 at 550 W kg −1 and 11.3 Wh kg −1 at 5.497 kW kg −1 ), Ni 3 S 2 @MoS 2 //rGO (21.7 Wh kg −1 at 400 W kg −1 and 12 Wh kg −1 at 2.40 kW kg −1 ), and NiCo 2 S 4 //AC (27.5 Wh kg −1 at 747 W kg −1 and 18.75 Wh kg −1 at 6.03 kW kg −1 ) …”

Metal-Supported Biochar Catalysts for Sustainable Biorefinery, Electrocatalysis, and Energy Storage Applications: A Review

“…Then this material showed 1137.5 F g −1 (at 5 A g −1 ) and retained 90.3% of its capacitance after 5000 cycles, and when it was tested in an asymmetric supercapacitor, using activated carbon as negative electrode, achieved an elevated energy density of ≈31 Wh kg −1 (at 900 W kg −1 ). In addition, the carbonization of catkins from diverse tree plants to produce Ni/Co-biocarbons for supercapacitors has been reported twice [113,114]. Thus, Nan et al [113] decorated poplar catkins-derived C microsheets with NiCo 2 O 4 and polydopamine (PD) (Figure 6a), testing an asymmetric supercapacitor system (positive electrode: NiCo 2 O 4 /PD/C and negative electrode: PD/C) with excellent performance: 39.1 Wh kg −1 at the power density of 800 W kg −1 , high cycling stability with a 4.5% capacity loss after 5000 cycles, and a wide potential window of 0-1.6 V. The other work [114] reported the production of willow catkin-derived carbon microtubes with supported Ni-Co sulfides nanoparticles.…”

“…In addition, the carbonization of catkins from diverse tree plants to produce Ni/Co-biocarbons for supercapacitors has been reported twice [113,114]. Thus, Nan et al [113] decorated poplar catkins-derived C microsheets with NiCo 2 O 4 and polydopamine (PD) (Figure 6a), testing an asymmetric supercapacitor system (positive electrode: NiCo 2 O 4 /PD/C and negative electrode: PD/C) with excellent performance: 39.1 Wh kg −1 at the power density of 800 W kg −1 , high cycling stability with a 4.5% capacity loss after 5000 cycles, and a wide potential window of 0-1.6 V. The other work [114] reported the production of willow catkin-derived carbon microtubes with supported Ni-Co sulfides nanoparticles. By adjusting the Ni precursor/Co precursor molar ratios (in both cases the corresponding acetates), the authors controlled Ni/Co ratios in the resulting nanocomposites.…”