Chinese Journal of Chemical Engineering, Vol.28, No.3, 854-863, 2020
Electrodeposition of aluminum on needle cathode using AlCl3/urea molten salts at low-temperature and its application to hydrogen generation
The electrodeposition of aluminum (Al) was studied using two electrolyte solutions, such as anhydrous AlCl3-urea and hydrated AlCl3 center dot 6H(2)O-urea. A systematic examination using cell voltages 1.0-2.0 V was carried out at temperatures ((50-100)+/- 2) degrees C. A needle-shaped cathode was employed for the deposition of aluminum. A dendrite and particulate microstructure of Al were observed on the needle-shaped cathode. An improved condition for the manufacturing of small sizes and high purity of aluminum deposits was obtained. Pure Al with a current efficiency (yield) of 84%-99% was obtained from those of non-aqueous electrolytes and only of 8.6%-9.3% from those of hydrated electrolytes. The electrical conductivities of electrolytes remained considerable at ((50-100) +/- 2) degrees C. The improved aluminum powders were used for the reaction with water. The aluminum reacts with water at room temperature, producing pure H-2 with 100% yield. The electro deposited aluminum metal can be used as an excellent energy carrier. (C) 2019 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.