Preparation And Electrosorption Of Nial-Mixed Metal Oxide Films On Nickel Foam Substrates

NiAl layered double hydroxide （NiAl-LDH） films are grown on thesurface of three-dimensional nickel foam by an in situ hydrothermalmethod using foam nickel substrates as nickel source, and AlOOH sol asaluminium source. NiAl-mixed metal oxide （NiAl-MMO） films areobtained by calcined NiAl-LDH films at400℃. The structure andsurface morphology of NiAl-LDH films are studied by X-ray diffraction,elemental analysis, room temperature Fourier transform infrared spectraand scanning electron microscopy analysis. These results show thatNiAl-LDH nanoplatelets densely covered on the surface of foam nickelsubstrate. The obtained NiAl-MMO films are used as positive electrodesfor electrosorption of Cl^-in water. Under static test conditions, the onceelectrosorption ratio for0.005mol·L-1Cl^-is about37.5%, while the Cl^-electrosorption capacity of the electrodes is0.467mg/cm²（77.8mg/gNiAl-LDH）. For5times electrosorption and desorption cycling, thedecreasing of electrosorption ratio is very little, and the once desorptionof Cl^-is about87.7%. It is indicated that the NiAl-MMO film electrodes can be used for the removal Cl^-or desalination in water.Then NiAl-MMO film used as positive electrodes for electrosorptionof S₂O₃^2-in water. Under static test conditions, the electrosorption ratiofor S₂O₃^2-was about10%, while electrosorption capacity of theelectrodes was0.056mg/cm². For5times electrosorption and desorption,the decreasing of electrosorption ratio was very little, and the one timedesorption of S₂O₃^2-was about89%. It is indicated that the NiAl-MMOfilm electrodes can be used for the removal and reuse of S₂O₃^2-inindustrial effluents.Through the electrochemical test，when current density were5,10,20,30mAcm^-2, the capacitance respectively is1750,1007,889,444Fg^-1,Research indicates that the NiAl-LDH film is expected to become supercapacitor materials.