Decorating nanoporous ZIF-67-derived NiCo₂O₄ shells on a Co₃O₄ nanowire array core for battery-type electrodes with enhanced energy storage performance

Abstract

A perfectly intact ZIF-67-derived NiCo2O4 shell had been decorated on a Co3O4 nanowire core. Due to the specific core–shell structure, the resulting hybrid nanowire array exhibited remarkable electrochemical properties.

Rational Design of Metal‐Organic Framework Derived Hollow NiCo2O4 Arrays for Flexible Supercapacitor and Electrocatalysis

“…Noting that the carbon cloth contributes very little (less than 0.5%) to the total capacitance ( Figure S4e,f, Supporting Information). [9,44,[48][49][50] Figure 5d further shows the excellent cycling stability and mechanical flexibility of the full cell, that 86.7% of the initial capacitance can well preserved after 20 000 cycles of charge-discharge at 5 mA cm −2 , even when the full cell was bended/twisted during the test (inset in Figure 5d). At a small current of 2.5 mA cm −2 , the CC@ CoNi 2 O 4 exhibits a high capacitance of 1055.3 F g −1 and a high capacitance of 483.3 F g −1 can be maintained even when the current density increased to 60 mA cm −2 , suggesting that 45.8% of the capacitance can be remained when the current increased 24 times.…”

“…A Pt plate is used as the counter electrode, and an Hg/HgO is used as the reference electrode. [44][45][46] From the CV curves of CC@ NiCo 2 O 4 , the peak positions only shift a little when the scan rate increased from 5 to 100 mV s −1 , indicating that the electrode has very good reversibility. For comparison, the solid Co 3 O 4 nanowalls on carbon cloth (noted as CC@Co 3 O 4 ) obtained by directly annealing the Co-MOF precursor in air is also tested, and detailed characterization of the solid Co 3 O 4 nanowalls can be found in Figure S3 (Supporting information).…”

Multicomponent Hierarchical Cu‐Doped NiCo‐LDH/CuO Double Arrays for Ultralong‐Life Hybrid Fiber Supercapacitor

“…Second, the ZIF was obtained by immersing CCCH NWAs in 2‐methylimidazole aqueous solution, followed by partially reacting. During this process, Cu 2+ and Co 2+ were released from the CCCH NWAs into the solution and coordinate with the organic linker 2‐methylimidazole immediately, resulting in in situ growth of ZIF on the surface of CCCH NWAs (Figure c) . Subsequently, the CCCH@ZIF‐67 NWAs were immersed in Ni(NO 3 ) 2 /Co(NO 3 ) 2 solution, and Co(OH) 2 /Ni(OH) 2 was formed by hydrolyzing, which leads to the generation of H + .…”

电化学离子交换法辅助制备可用作高性能超级电容器电极的Co3O4/NiCo2O4纳米复合材料

“…Compared with the pristine Co 3 O 4 electrode (69% retention at current density of 50 mA cm -2 ), the 74% retention for the Co 3 O 4 /NiCo 2 O 4 electrode at the same current density indicates the importance of Ni ion in enhancing the rate stability. In addition, the rate stability is also much better than those of the reported Co-Co 3 O 4 nanowires (57.1% at current density of 40 mA cm -2 ) [43] and NiCo 2 O 4 @rGO hybrid nanostructures (82% at current density of 20 mA cm -2 ) [44], which may be ascribed to the unique 3D structure of the combination of nanosheets and nanoneedles. The Nyquist plots of Co 3 O 4 / Table S1.…”