A nanoporous nickel-vanadium-manganese/oxide composite electrode and its preparation method
A nanoporous nickel and composite electrode technology, which is applied in the manufacture of hybrid capacitor electrodes, hybrid/electric double layer capacitors, etc., can solve the problem of capacitance reduction and achieve the effects of increased specific capacitance, good conductivity, and increased specific capacitance retention rate
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Embodiment 1
[0024] The preparation method is as follows:
[0025] (1) Preparation of alloy strips: Ni, 15% V, and 60% Mn with an atomic content percentage of 25%, respectively, are stripped under the protection of argon at 1200rad / s-1800rad / s Under the rotating speed, an alloy strip with a thickness of 20-30um and a width of 2-3mm is produced.
[0026] (2) Preparation of nanoporous alloy by dealloying: the alloy strip obtained in step (1) is made into an experimental strip with a width of 1.5-4mm and a length of 1-100mm; the nanoporous electrode is prepared by electrochemical corrosion , The three-electrode Shanghai Chenhua Electrochemical Workstation was selected, the alloy strip was used as the working electrode, the platinum sheet was used as the counter electrode, and the Ag / Agcl electrode was used as the reference electrode. The ammonium sulfate solution of 0.5-2mol / L is a dealloying solution, which is corroded for 3600-10000s under the voltage of -0.45V-0.65V.
[0027] (3) Prepara...
Embodiment 2
[0034] The only difference from Example 1 is that the atomic content percentage of each component in step (1) is: 20% Ni, 20% V, 60% Mn.
[0035] See Figure 6This is the specific capacity diagram of the Ni20V20Mn60 nanoporous nickel-vanadium-manganese / oxide composite electrode in this example at different current densities, and the specific capacity retention ratio can be calculated according to the comparison of the specific capacity at different current densities.
Embodiment 3
[0037] The only difference from Example 1 is that the atomic content percentage of each component in step (1) is: 20% Ni, 10% V, 70% Mn.
[0038] Table 1 shows the electrochemical performance measurement results of the nanoporous nickel-vanadium-manganese / oxide composite electrodes prepared in Examples 1-3.
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