(中國科學(xué)院 上海微系統(tǒng)與信息技術(shù)研究所 能源科學(xué)與技術(shù)研究室， 上海 200050)
摘 要: 通過V4Fe對Mn的替代， 系統(tǒng)研究了儲氫合金TiMn1.25-5yCr0.25(V4Fe)y（y=0, 0.02, 0.04, 0.06, 0.08）的儲氫性能。 XRD結(jié)果顯示： 合金為C14型Laves相結(jié)構(gòu)， 合金的晶胞參數(shù)隨著V↓4Fe量的增加而增大。 PCT結(jié)果表明： 適量的V4Fe替代Mn可增加合金的儲氫量， 降低平衡壓和減少滯后。 退火處理可使合金的相結(jié)構(gòu)均勻化， 進一步改善合金的儲氫性能。 TiMn0.95Cr0.25(V4Fe)0.06合金在1223K下退火處理6h后， 最大和有效儲氫量分別為2.0%和1.75%（質(zhì)量分數(shù)）， 且滯后效應(yīng)小， 適合于作為質(zhì)子交換膜燃料電池的供氫源。
關(guān)鍵字: TiMn1.25-5yCr0.25(V4Fe)y; 儲氫量; 平衡壓; 滯后; 退火
（Laboratory of Energy Science and Technology, Shanghai Institute of Microsytem
and Information Technology, The Chinese Academy of Sciences,
Shanghai 200050, China）
Abstract:The reversible hydrogen absorption and desorption behavior of TiMn1.25-5yCr0.25(V4Fe)y(y=0, 0.02, 0.04, 0.06, 0.08) was investigated by substitution for partial Mn at 273K, 293K and 313K. XRD results show that the alloys have C14 Laves phase structure and with increasing content, the lattice paramters of alloy are increased. PCT results show that substitution can increase the hydrogen storage capacity, decrease the plateau pressure and the hysteresis of the PCT. However, it can also increase the slope of the PCT. After being annealed at 1223K for 6h, TiMn0.95Cr0.25(V4Fe)0.06 alloy has a low desorption plateau pressure (1.04×105 Pa at 273K and 2.72×105 Pa at 313K) and a small hysteresis (0.14 at 273K and 0.12 at 313K). The maximum and effective hydrogen storage capacities are 2.0% and 1.75%(mass fraction) respectively, which are suitable for hydrogen storage tanks in PEMFC.
Key words: hydrogen storage capacity; TiMn1.25-5yCr0.25(V4Fe)y; plateau pressure; hysteresis; annealing
