(北京有色金屬研究總院 能源材料與技術(shù)研究所，北京 100088)
摘 要: 采用化學(xué)鍍方法在TiZrNiCo合金顆粒表面包覆上0.4~2 μm厚的Pd膜，并測得不同膜厚的Pd/TiZrNiCo試樣在混合氣體中的吸氫動力學(xué)。結(jié)果表明：Pd膜越薄，Pd/TiZrNiCo抗毒化性能及吸氫動力學(xué)性能越好，0.4 μm厚Pd膜試樣的吸氫量為2 μm厚Pd膜試樣的1.6倍。Pd/TiZrNiCo試樣吸放氫后粉化，引發(fā)Pd膜破裂導(dǎo)致吸氫速率減緩與基體粉化引發(fā)吸氫速率加快的兩種效果，吸氫量隨吸放氫次數(shù)的增加而出現(xiàn)波動性的上升回落。根據(jù)吸氫機理及毒化機理，提出并采用相應(yīng)的動力學(xué)模型，并對TiZrNiCo吸純氫及Pd/TiZrNiCo吸氫動力學(xué)曲線進(jìn)行了擬合。
關(guān)鍵字: Pd膜；抗毒化；動力學(xué)；循環(huán)壽命；動力學(xué)模型
（Institute of Energy Materials and Technology, General Research Institute for Non-ferrous Metals,
Beijing 100088, China）
Abstract:Pd membranes with thickness of 0.4-2 μm were deposited on the surface of TiZrNiCo alloy particles by electroless plating method. Hydrogen absorption kinetics of Pd/TiZrNiCo was measured under mixed gas. The results show that, for the Pd/TiZrNiCo, the thinner the Pd membrane, the better the poisoning resistance and hydrogen adsorption kinetic properties. The pulverization of Pd/TiZrNiCo after hydrogen absorption-desorption leads the two results, such as the decrease of hydrogen absorption caused by the Pd membrane rupture and the increase of hydrogen absorption caused by Pd pulverization. Therefore, the hydrogen absorption-desorption repeating leads to the fluctuation of hydrogen absorption quantity of Pb/TiZrNiCo. Kinetic model for hydrogen absorption under pure hydrogen and mixed gas was built based on hydrogen absorption and impurity gas poisoning mechanism. The hydrogen absorption dynamic curves of TiZrNiCo and Pd/TiZrNiCo were fitted.
Key words: Pd membrane; poisoning resistance; kinetics; cycling stability; kinetic model
