Enhancement of hydrogenation kinetics and thermodynamic properties of ZrCo1-xCrx (x=0-0.1) alloys for hydrogen storage

• 作者: Dongliang Zhao Ge Sang Guanghui Zhang Huaqin Kou Linling Luo Renjin Xiong Ronghai Yu Xiaoqiu Ye
• 来源期刊: 中国物理B（英文版）
• 年，卷（期）: 2020,（8）
• 所属期刊栏目: INTERDISCIPLINARY PHYSICS AND RELATED AREAS OF SCIENCE AND TECHNOLOGY
• 页码范围: 619-629
• 页数: 11页
• 语种: 英文
• DOI: 10.1088/1674-1056/ab9289

摘要

The vacuum arc melting method was used to prepare ZrCo1-xCrx (x =0,0.025,0.05,0.075,0.1) alloys.Afterward,the crystal structure,hydrogenation kinetics,thermodynamic properties,and disproportionation performance of ZrCo1-xCrx (x =0-0.1) alloys were investigated.The x-ray diffraction spectra demonstrated that ZrCo1-xCrx (x =0-0.1) alloys contained ZrCo and ZrCo2 phases,and their corresponding hydrides consisted of ZrCoH3 and ZrH phases.The activation behaviors of Cr-substituted samples were significantly promoted.The activation time of ZrCo was 7715 s while that of ZrCo0.9Cr0.1 was 195 s.The improvement of kinetics can be attributed to the catalytic hydrogenation of ZrCr2.The activation energy for the hydrogenation of ZrCo was 44.88-kJ.mol-1 H2 and decreased to 40.34-kJ.mol-1 H2 for ZrCo0.95Cr0.05.The plateau pressure and width of the pressure-composition-temperature curves decreased slightly as Cr content increased.The extent of disproportionation of ZrCo was 83.68％ after being insulated at 798 K for 10 h and decreased slightly to 70.52％ for ZrCo0.9Cr0.1.The improvement of anti-disproportionation performance can be attributed to increase in the activation energy of disproportionation from 167.46-kJ.mol-1 H2 for ZrCo to 168.28-kJ.mol-1 H2 for ZrCo0.95 Cr0.05.