CAJ | 학술논문

采用机械球磨法制备非晶态的Ti2?xMgxNi(x=0?0.3)合金粉末。通过充放电测试、线性极化和电位阶跃等方法研究非平衡态Ti2?xMgxNi(x=0?0.3)合金热处理前后的电化学储氢性能。结果表明：热处理后Ti2?xMgxNi合金的最大放电容量高达275.3 mA·h/g，比非晶态的Ti2?xMgxNi合金的放电容量高100 mA·h/g。Ti1.9Mg0.1Ni合金的循环稳定性最好，经30次循环后的容量保持在210 mA·h/g。经过热处理的Ti1.9Mg0.1Ni合金的交换电流密度从101.1 mA/g增大到203.3 mA/g，氢扩散系数从3.20×10?11 cm2/s增大到2.70×10?10 cm2/s，表明热处理明显促进了电极的电子转移和氢扩散过程，从而提高了Ti2?xMgxNi合金的电化学储氢性能。
채용궤계구마법제비비정태적Ti2?xMgxNi(x=0?0.3)합금분말。통과충방전측시、선성겁화화전위계약등방법연구비평형태Ti2?xMgxNi(x=0?0.3)합금열처리전후적전화학저경성능。결과표명：열처리후Ti2?xMgxNi합금적최대방전용량고체275.3 mA·h/g，비비정태적Ti2?xMgxNi합금적방전용량고100 mA·h/g。Ti1.9Mg0.1Ni합금적순배은정성최호，경30차순배후적용량보지재210 mA·h/g。경과열처리적Ti1.9Mg0.1Ni합금적교환전류밀도종101.1 mA/g증대도203.3 mA/g，경확산계수종3.20×10?11 cm2/s증대도2.70×10?10 cm2/s，표명열처리명현촉진료전겁적전자전이화경확산과정，종이제고료Ti2?xMgxNi합금적전화학저경성능。
Amorphous Ti2?xMgxNi (x=0?0.3) alloys were prepared by mechanical milling of elemental powders. Charge and discharge test, linear polarization (LP) and potential-step measurement were carried out to investigate the electrochemical hydrogen storage properties of the alloys before and after heat treatment. The results show that the maximum discharge capacity of heat-treated Ti2?xMgxNi alloy can reach 275.3 mA·h/g, which is 100 mA·h/g higher than that of the amorphous Ti2?xMgxNi alloy. The heat-treated Ti1.9Mg0.1Ni alloy presents the best cycling stability with a high discharge capacity of 210 mA·h/g after 30 cycles. The results of LP and potential-step measurement of the Ti1.9Mg0.1Ni alloy show that the exchange current density increases from 101.1 to 203.3 mA/g and the hydrogen diffusion coefficient increases from 3.20×10?11 to 2.70×10?10 cm2/s after the heat treatment, indicating that the heat treatment facilitates both the charge-transfer and hydrogen diffusion processes, resulting in an improvement in electrochemical hydrogen storage properties of Ti2?xMgxNi (x=0?0.3) alloys.