Rational construction of ternary ZnNiP arrayed structures derived from 2D MOFs for advanced hybrid supercapacitors and Zn batteries

Ni foam-supported Zn–Co–Ni ternary oxide nanosheet arrays derived from an MOF precursor with enhanced performances for supercapcitors and Ni–Zn batteries

“…What is impressive is that when the power density is increased to 33 kW kg −1 , the battery can still achieve an energy density of 208.85 W h kg −1 , which is better than many previously reported Zn-based batteries (Table S4, ESI†), such as ZnO/Co 3 O 4 //Zn (36.6 W h kg −1 at 0.356 kW kg −1 ), 47 Co 3 O 4 //Zn (241 W h kg −1 at 1.506 kW kg −1 ), 49 MoZ-12//Zn (65 W h kg −1 at 0.65 kW kg −1 ), 53 PbO 2 //Zn (252.39 W h kg −1 at 0.57 kW kg −1 ), 54 Ni, Zn-MgCo 2 O 4 //Zn (120.4 W h kg −1 at 0.312 kW kg −1 ), 55 and CuV 2 O 6 //Zn (317 W h kg −1 at 0.21 kW kg −1 ), 56 A-Co(OH) 2 @ NiCo-LDH//Zn (489.6 W h kg −1 at 0.38 kW kg −1 ), 57 and the ZnNiP-0.5//RGO (67.4 W h kg −1 at 0.825 kW kg −1 ). 58…”

Novel Core–Shell‐Structured Zeolitic Imidazolate Framework (ZIF)‐90@ZIF‐67 Applied for High‐Performance All‐Solid‐State Asymmetric Supercapacitor

“…[ 56 ] The Zn 2 p spectrum of ZIF‐90@ZIF‐67 was shown in Figure 4c, the peaks at 1022.1 and 1045.3 eV were attributed to the Zn 2 p 3/2 and Zn 2 p 1/2 orbitals of Zn 2+ . [ 57 ] The weak peak at 291.6 eV in the C 1s spectrum can be assigned to CC, which was from the imidazolate ring of imidazole‐2‐c arboxaldehyde (Figure 4d). For the N 1s spectrum displayed in Figure 4e, the low peak at about 407.2 eV corresponded to NO 3 − which was possibly from cobalt nitrate hexahydrate in the synthesis.…”

Nanostructuring Nickel–Zinc–Boron/Graphitic Carbon Nitride as the Positive Electrode and BiVO4-Immobilized Nitrogen-Doped Defective Carbon as the Negative Electrode for Asymmetric Capacitors

“…XPS analysis indicates the Ni–Zn–B/g-C 3 N 4 nanosheet network structures contain various metal ions (Ni 2+ , Ni 3+ , and Zn 2+ ), while the XRD and SAED patterns explore Ni–Zn–B/g-C 3 N 4 with amorphous character, suggesting that some Zn 2+ may take the behavior of metal-ion doping in the Ni–Zn–B/g-C 3 N 4 material. The partial doping by Zn 2+ ions may not only adjust the electronic property of the resultant hybrid but also boost the redox reaction kinetics. , Furthermore, Zn doping may form certain lattice defects because of lattice mismatches and allow B atoms to attract more bonding electrons. Consequently, the electron-conduction highways for Faradaic redox reactions may be extremely promoted by incorporating Zn 2+ to construct the Ni–Zn–B/g-C 3 N 4 hybrid.…”

“…Theoretically, inserting Zn 2+ ions into the crystal lattice may further stabilize the microstructure and chemical environment during electrochemical reactions . Additionally, the Zn element allows better electronic conductivity and enables proper accessibility of reactive species on the newly formed active sites, while the multiple oxidation states of Ni modify the electrochemical activity and capacity. , The strong coordination potential may result in a large range of active sites on the surface for efficient reversible Faradaic reaction. The orbital overlap between Ni and Zn improves the atomic interactions and thereby enhances the stability of the electrode.…”

“…The partial doping by Zn 2+ ions may not only adjust the electronic property of the resultant hybrid but also boost the redox reaction kinetics. 18,19 Furthermore, Zn doping may form certain lattice defects because of lattice mismatches and allow B atoms to attract more bonding electrons. Consequently, the electron-con- The substitutional B into g-C 3 N 4 may boost the synergistic effect, induce some defects, delocalize the conjugated π structure, and therefore modify the electronic configuration.…”