詹 鋒1， 鄭 強(qiáng)1， 尉秀英1
(1. 北京有色金屬研究總院 能源材料及技術(shù)研究中心，
北京 100088；
2. 北京科技大學(xué) 理化系， 北京 100083)
摘 要: 用氫化燃燒法合成Mg2-xAgxNi (x=0.05, 0.1, 0.2, 0.5)和
Mg2-xAlxNi (x=0, 0.1, 0.2, 0.5)。 PCT結(jié)果說(shuō)明合成的Mg-Ni-Ag和Mg-Ni-Al儲(chǔ)氫合金材料具有很高的活性和理想的儲(chǔ)氫性能。 對(duì)兩個(gè)體系的PCT結(jié)果分別進(jìn)行計(jì)算， 得出溫度和氫平衡壓的關(guān)系式。 在423K時(shí)Mg1.8Ag0.2Ni在5min之內(nèi)的放氫量為2.14%/min(質(zhì)量分?jǐn)?shù))； Mg1.5Al0.5Ni在α+β相區(qū)的吸氫速率為4.88%/min(質(zhì)量分?jǐn)?shù))， 放氫速率為1.26%/min(質(zhì)量分?jǐn)?shù))。 用XRD方法進(jìn)行物相分析表明： 添加少量銀沒(méi)有改變Mg2Ni的結(jié)構(gòu)； 添加鋁卻改變了Mg2Ni的結(jié)構(gòu)，使儲(chǔ)氫合金材料的儲(chǔ)放氫動(dòng)力學(xué)性能均得到改善。
關(guān)鍵字: 氫化燃燒合成； 儲(chǔ)氫合金； Mg-Ag-Ni； Mg-Al-Ni； 儲(chǔ)氫性能
ZHAN Feng1, ZHENG Qiang1, WEI Xiu-ying1
（1. Research Center of Energy Materials and Technology,General Research Institute for Nonferrous Metal, Beijing 100088, China;
2. Department of Physical Chemistry,
University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Mg2-xAgxNi (x=0.05, 0.1, 0.2, 0.5) and Mg2-xAlxNi (x=0, 0.1, 0.2, 0.5) ternary alloys were synthesized by hydriding combustion. All the alloys were examined by means of pressure-composition isotherms(PCT) and X-ray diffraction (XRD). The relationships between the equilibrium plateau pressure and the temperature were calculated. The alloy Mg1.8Ag0.2Ni desorbs 2.14%H in less than 5min at 423K and under the same condition the kinetic rates of Mg1.5Al0.5Ni in α+β phase are 4.88%/min H for absorption and 1.26%/min H for desorption. The results of XRD show that the kinetics of the materials are improved due to the change of structure of Mg2Ni and chemical homogeneity on surface of particles.
Key words: hydriding combustion synthesis; hydrogen storage alloys; Mg-Ag-Ni; Mg-Al-Ni; property of hydrogen storage
