Preparation And Electrochemical Studies On The Catalytic Activity Anode Material For Water Electrolysis In Alkaline Media

In the industry of water electrolysis, the higher oxygen evolution overvoltage is the main reason for energy sources consuming. So we must research and empolder the high capability anode material to reduce the higher oxygen evolution overvoltage. That is effective method in the industry of water electrolysis for the moment. Generally, we can begin our work from in the following three ways: (1) To heighten temperature of electrolysis; (2) To increase the active surface of electrochemistry; (3) To adopt the advanced electrochemistry catalyst. But comparing the three ways, the best is (3), because high temperature results in the corrosiveness of electrode materials and increasing active surface is very limited.1. Ni-Co and Ni-La composite oxide on spumy nickel which were prepared by pyrolysis of metal nitrate were taken on a fine catalytic activity for oxygen evolution in alkaline water. The result of XRD analysis indicated that the spinel NiCo2O4 electrode could be made at 300℃～350℃and the perovskite LaNiO3 electrode at 550℃～600℃by pyrolysis. The oxygen evolution overvoltage of NiCo2O4 composite oxide electrode was reduction of about 130mV relative to spumy nickel electrode and LaNiO3 composite oxide electrode was reduction of about 200mV at 25℃, 5000A/m2 in 30% KOH solution.To test the catalytic activity of the anode materials we simulate the industry of water electrolysis equipment, the result is over 10% economization in energy sources consuming by LaNiO3.2. NiCo2O4 nanocrystalline composite oxide was prepared by precipitation transformation method. The influence of transformation temperature and concentrations of transformation agent and anti-agregative agent(tween-80) and heating temperature were studied in detail. The optimal technics conditions are the following: the reactants concentration is 0.75M; the temperature of deposition conversion is 70℃; the concentration of NaOH is 0.05～0.1M; the pyrolysis temperature is 260℃～300℃. We can produce NiCo2O4 composite oxide with the average granularity 28.3nm, from 20 to 100nm.3. The Ni/NiCo2O4 composite plating is another fine catalytic activity for oxygen evolution in alkaline water, the more of the NiCo2O4 content, the batter catalytic activity for oxygen evolution. The oxygen evolution overvoltage of Ni/NiCo2O4 was reduction of 190mV relative to nickel electrode going with fine stability at 25℃, 5000A/m~2 in 30% KOH solution.