The Preparation And Study Of The Activated Anode For Hydrogen Evolution Used In Chlor-alkali Industry

The energy consumed in chlor-alkali industry is very large, the cost of energy accounts for 50% of the alkali producing .So much power consuming astricted the development of the chlor-alkali industry greatly. With the crisis of the energy resources, the price of the power rises greatly, it is importance for the chlor-alkali enterprises to develop new technology to reduce the consuming of the energy and increase the benefits. At present with the popularization of the DSA anode the over-potential of the chlorine evolution, therefore, it is necessary for the chlor-alkali industry to reduce the over-potential of the cathode.In this paper, the orthogonal experiments were used to optimize the process conditions of the electro-deposition of Ni-Mo alloy. The catalytic property of the electrodes in hydrogen evolution reaction (HER) in the solution used in chlor-alkali industry was studied by steady-state polarization and the ac impedance measurements. The overpotential of HER at the current density of j=0.10 A·cm^-2 of Ni-Mo alloy was about 400mV lower than that of the pure Ni electrode and the apparent activation energies of HER is only about 24.89KJ/mol. The surface morphology and crystal structure were evaluated by SEM and XRD analysis, which showed that the surface of Ni-Mo alloy was tough and the structure was nano-crystal.Ni/PAN composite electrodes were prepared by double pulse electroplating. Ni²⁺ ions were deoxidized on the surface of the electrode during the negative pulse, which is the electrodeposition of Ni; monomer aniline was oxidized during the positive pulse which is electro-polymerized of polyaniline(PAN), positive and negative pulse were given 20 times alternatively. From the SEM analysis the cauliflower-form PAN was found, which affluenced the property of hydrogen evolution apparently. The real area of Ni-PAN surface is 4-50 times larger than that of Ni electrode. The properties of hydrogen evolution reaction were studied in the solution used in chlor-alkaline industry. From the electro-chemical analysis, at the current density of j= 0.10A·cm^-2, the overpotential of hydrogen evolution is 350mV lower than that of Ni electrode. The catalytic property of hydrogen evolution was improved.