TY - JOUR
T1 - Effect of sintering temperature on electrochemical properties of TiNi hydrogen storage alloy
AU - Qu, Xinxin
AU - Ma, Liqun
AU - Yang, Meng
AU - Ding, Yi
PY - 2010/5
Y1 - 2010/5
N2 - The structure and electrochemical properties of TiNi hydrogen storage alloys, prepared by solid phase sintering at 750, 850 or 950°C, were investigated by using X-ray diffraction(XRD), charge and discharge testing, linear polarization, and potential-step measurement. The results showed that the maximum discharge capacity increased from 179.0 to 188.1 and 211.3 mAh·g-1 with the increase of the sintering temperature. Although the increase of the sintering temperature lead to a decrease in exchange current density, hydrogen diffusion within the bulk alloy was enhanced dramatically, and resulted in a significant improvement in high rate dischargeability (HRD). The hydrogen diffusion coefficient D of TiNi hydrogen storage alloy increased from 2.49×10-10 cm2·s-1 (sintered at 750°C) to 2.61×10-10 cm2·s-1 (sintered at 850°C) and 3.48×10-10 cm2·s-1 (sintered at 950°C), respectively. The discharge capacity of TiNi hydrogen storage alloy, sintered at 950°C, was 84.6 mAh·g-1 even at 1500 mA·g-1.
AB - The structure and electrochemical properties of TiNi hydrogen storage alloys, prepared by solid phase sintering at 750, 850 or 950°C, were investigated by using X-ray diffraction(XRD), charge and discharge testing, linear polarization, and potential-step measurement. The results showed that the maximum discharge capacity increased from 179.0 to 188.1 and 211.3 mAh·g-1 with the increase of the sintering temperature. Although the increase of the sintering temperature lead to a decrease in exchange current density, hydrogen diffusion within the bulk alloy was enhanced dramatically, and resulted in a significant improvement in high rate dischargeability (HRD). The hydrogen diffusion coefficient D of TiNi hydrogen storage alloy increased from 2.49×10-10 cm2·s-1 (sintered at 750°C) to 2.61×10-10 cm2·s-1 (sintered at 850°C) and 3.48×10-10 cm2·s-1 (sintered at 950°C), respectively. The discharge capacity of TiNi hydrogen storage alloy, sintered at 950°C, was 84.6 mAh·g-1 even at 1500 mA·g-1.
KW - Electrochemical property
KW - Hydrogen storage alloy
KW - Solid phase sintering
KW - TiNi alloy
UR - http://www.scopus.com/inward/record.url?scp=77954017493&partnerID=8YFLogxK
U2 - 10.3969/j.issn.0258-7076.2010.03.003
DO - 10.3969/j.issn.0258-7076.2010.03.003
M3 - 文章
AN - SCOPUS:77954017493
SN - 0258-7076
VL - 34
SP - 331
EP - 335
JO - Xiyou Jinshu/Chinese Journal of Rare Metals
JF - Xiyou Jinshu/Chinese Journal of Rare Metals
IS - 3
ER -