高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (9): 1993.doi: 10.7503/cjcu20180169
收稿日期:
2018-03-04
出版日期:
2018-09-07
发布日期:
2018-06-11
作者简介:
联系人简介: 罗永春, 男, 博士, 教授, 主要从事储氢材料和电化学应用研究. E-mail:
基金资助:
ZHAO Lei1, LUO Yongchun1,2,*(), DENG Anqiang1, JIANG Wanting1
Received:
2018-03-04
Online:
2018-09-07
Published:
2018-06-11
Contact:
LUO Yongchun
E-mail:luoyc@lut.cn
Supported by:
摘要:
采用真空电弧熔炼和热处理(950 ℃×10 h)方法制备了新型无镁超点阵结构A2B7型La1-xYxNi3.25Mn0.15Al0.1(x=0, 0.25, 0.50, 0.67, 0.75, 0.85, 1.00)退火合金, 研究了A端稀土Y元素对退火合金微观组织结构、 储氢行为及电化学性能的影响. 结果表明, 退火合金微观组织的主相均由Ce2Ni7型结构组成, 随稀土Y含量x增大, Ce2Ni7型主相丰度呈先增加后减小的规律, 同时Ce2Ni7型主相的晶胞体积V逐渐减小. 气体储氢时, x=0~0.25合金无压力-组成-温度(PCT)曲线平台且易形成氢致非晶化; 当x≥0.50时, 合金能有效抑制储氢时的氢致非晶化倾向且具有明显的吸/放氢平台特征, 吸氢平台压范围为0.026~0.097 MPa, 最大储氢量为1.418%~1.48%(质量分数), 储氢性能得到极大改善. 电化学测试结果表明, x=0.50~0.85的合金具有较高的电化学放电容量(350.4~381 mA·h/g), 经100次充放电循环后容量保持率S100=52%~85%, 其中稀土Y含量x=0.67~0.75时的合金具有良好的储氢性能及较好的综合电化学性能. 合金电极的高倍率放电性能HRD900=64.5%~85.7%, 氢原子在合金体相中的扩散是电极反应动力学过程的控制步骤.
中图分类号:
TrendMD:
赵磊, 罗永春, 邓安强, 姜婉婷. 无镁超点阵结构A2B7型La1-xYxNi3.25Mn0.15Al0.1合金的储氢和电化学性能. 高等学校化学学报, 2018, 39(9): 1993.
ZHAO Lei,LUO Yongchun,DENG Anqiang,JIANG Wanting. Hydrogen Storage and Electrochemical Properties of the Mg-free A2B7-type La1-xYxNi3.25Mn0.15Al0.1 Alloys with Superlattice Structure†. Chem. J. Chinese Universities, 2018, 39(9): 1993.
Fig.1 Back scattered SEM images of the annealed La1-xYxNi3.25Mn0.15Al0.1(x=0—1) alloys (A) x=0; (B) x=0.25; (C) x=0.50; (D) x=0.67; (E) x=0.75; (F) x=0.85; (G) x=1.00.
Fig.2 EDS results for different regions of the annealed La1-xYxNi3.25Mn0.15Al0.1 alloys(x=0.5, 0.85) in Fig.1 (A) Area 1 of x=0.50; (B) area 2 of x=0.50; (C) area 3 of x=0.85; (D) area 4 of x=0.85.
x | Normal composition | Chemical compositions by ICP, w(%) | Stoichiometric B/A ratio | ||||
---|---|---|---|---|---|---|---|
La | Y | Ni | Mn | Al | |||
0 | LaNi3.25Mn0.15Al0.1 | 40.80 | 0 | 54.42 | 3.14 | 1.64 | 3.52 |
0.25 | La0.75Y0.25Ni3.25Mn0.15Al0.1 | 31.01 | 6.48 | 58.67 | 2.93 | 0.91 | 3.56 |
0.50 | La0.5Y0.5Ni3.25Mn0.15Al0.1 | 21.67 | 14.10 | 60.53 | 2.66 | 0.94 | 3.54 |
0.67 | La0.33Y0.67Ni3.25Mn0.15Al0.1 | 14.49 | 19.35 | 62.74 | 2.56 | 0.87 | 3.56 |
0.75 | La0.25Y0.75Ni3.25Mn0.15Al0.1 | 10.84 | 22.35 | 63.34 | 2.54 | 0.92 | 3.45 |
0.85 | La0.15Y0.85Ni3.25Mn0.15Al0.1 | 6.28 | 25.70 | 64.66 | 2.41 | 0.94 | 3.53 |
1.00 | YNi3.25Mn0.15Al0.1 | 0 | 31.51 | 65.14 | 2.71 | 0.93 | 3.44 |
Table 1 Chemical compositions of the annealed alloys La1-xYxNi3.25Mn0.15Al0.1 by ICP analysis
x | Normal composition | Chemical compositions by ICP, w(%) | Stoichiometric B/A ratio | ||||
---|---|---|---|---|---|---|---|
La | Y | Ni | Mn | Al | |||
0 | LaNi3.25Mn0.15Al0.1 | 40.80 | 0 | 54.42 | 3.14 | 1.64 | 3.52 |
0.25 | La0.75Y0.25Ni3.25Mn0.15Al0.1 | 31.01 | 6.48 | 58.67 | 2.93 | 0.91 | 3.56 |
0.50 | La0.5Y0.5Ni3.25Mn0.15Al0.1 | 21.67 | 14.10 | 60.53 | 2.66 | 0.94 | 3.54 |
0.67 | La0.33Y0.67Ni3.25Mn0.15Al0.1 | 14.49 | 19.35 | 62.74 | 2.56 | 0.87 | 3.56 |
0.75 | La0.25Y0.75Ni3.25Mn0.15Al0.1 | 10.84 | 22.35 | 63.34 | 2.54 | 0.92 | 3.45 |
0.85 | La0.15Y0.85Ni3.25Mn0.15Al0.1 | 6.28 | 25.70 | 64.66 | 2.41 | 0.94 | 3.53 |
1.00 | YNi3.25Mn0.15Al0.1 | 0 | 31.51 | 65.14 | 2.71 | 0.93 | 3.44 |
Fig.3 XRD patterns of the annealed La1-xYxNi3.25Mn0.15Al0.1(x=0—1.00) alloys(A, B) and Rietveld refinement XRD profile of the La0.15Y0.85Ni3.25Mn0.15Al0.1 alloy(C)
x | Phase type | Space group | Lattice parameter | Phase abundance, w(%) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
a/nm | c/nm | c/a | V/nm3 | ||||||||
0 | Ce2Ni7-type | P63/mmc(194) | 0.5060 | 2.4586 | 4.859 | 0.545154 | 39.56 | ||||
Gd2Co7-type | R | 0.5001 | 3.6326 | 7.264 | 0.786796 | 18.24 | |||||
Ce5Co19-type | R | 0.4952 | 4.9093 | 9.914 | 1.042585 | 17.64 | |||||
LaNi5-type | P6/mmm(191) | 0.5013 | 0.3987 | 0.795 | 0.086771 | 24.56 | |||||
0.25 | Ce2Ni7-type | P63/mmc(194) | 0.5049 | 2.4521 | 4.857 | 0.541352 | 48.26 | ||||
Gd2Co7-type | R | 0.5000 | 3.6320 | 7.264 | 0.786351 | 10.38 | |||||
Ce5Co9-type | R | 0.4948 | 4.8743 | 9.851 | 1.033480 | 41.36 | |||||
0.50 | Ce2Ni7-type | P63/mmc(194) | 0.5021 | 2.4393 | 4.858 | 0.532569 | 81.03 | ||||
PuNi3-type | R | 0.5000 | 2.4350 | 4.870 | 0.527193 | 18.97 | |||||
0.67 | Ce2Ni7-type | P63/mmc(194) | 0.5015 | 2.4332 | 4.852 | 0.530880 | 86.61 | ||||
PuNi3-type | R | 0.5000 | 2.4350 | 4.870 | 0.529966 | 13.39 | |||||
0.75 | Ce2Ni7-type | P63/mmc(194) | 0.5003 | 2.4303 | 4.858 | 0.526807 | 100.00 | ||||
0.85 | Ce2Ni7-type | P63/mmc(194) | 0.4977 | 2.4223 | 4.867 | 0.519630 | 62.54 | ||||
YNi3-type | R | 0.4986 | 2.4223 | 4.948 | 0.521511 | 37.46 | |||||
1.00 | Ce2Ni7-type | P63/mmc(194) | 0.4965 | 2.4237 | 4.882 | 0.517426 | 56.72 | ||||
YNi3-type | R | 0.4978 | 2.4361 | 4.894 | 0.522800 | 43.28 |
Table 2 Characteristics of phase structures and lattice parameters of the annealed alloys La1-xYxNi3.25Mn0.15Al0.1
x | Phase type | Space group | Lattice parameter | Phase abundance, w(%) | |||||||
---|---|---|---|---|---|---|---|---|---|---|---|
a/nm | c/nm | c/a | V/nm3 | ||||||||
0 | Ce2Ni7-type | P63/mmc(194) | 0.5060 | 2.4586 | 4.859 | 0.545154 | 39.56 | ||||
Gd2Co7-type | R | 0.5001 | 3.6326 | 7.264 | 0.786796 | 18.24 | |||||
Ce5Co19-type | R | 0.4952 | 4.9093 | 9.914 | 1.042585 | 17.64 | |||||
LaNi5-type | P6/mmm(191) | 0.5013 | 0.3987 | 0.795 | 0.086771 | 24.56 | |||||
0.25 | Ce2Ni7-type | P63/mmc(194) | 0.5049 | 2.4521 | 4.857 | 0.541352 | 48.26 | ||||
Gd2Co7-type | R | 0.5000 | 3.6320 | 7.264 | 0.786351 | 10.38 | |||||
Ce5Co9-type | R | 0.4948 | 4.8743 | 9.851 | 1.033480 | 41.36 | |||||
0.50 | Ce2Ni7-type | P63/mmc(194) | 0.5021 | 2.4393 | 4.858 | 0.532569 | 81.03 | ||||
PuNi3-type | R | 0.5000 | 2.4350 | 4.870 | 0.527193 | 18.97 | |||||
0.67 | Ce2Ni7-type | P63/mmc(194) | 0.5015 | 2.4332 | 4.852 | 0.530880 | 86.61 | ||||
PuNi3-type | R | 0.5000 | 2.4350 | 4.870 | 0.529966 | 13.39 | |||||
0.75 | Ce2Ni7-type | P63/mmc(194) | 0.5003 | 2.4303 | 4.858 | 0.526807 | 100.00 | ||||
0.85 | Ce2Ni7-type | P63/mmc(194) | 0.4977 | 2.4223 | 4.867 | 0.519630 | 62.54 | ||||
YNi3-type | R | 0.4986 | 2.4223 | 4.948 | 0.521511 | 37.46 | |||||
1.00 | Ce2Ni7-type | P63/mmc(194) | 0.4965 | 2.4237 | 4.882 | 0.517426 | 56.72 | ||||
YNi3-type | R | 0.4978 | 2.4361 | 4.894 | 0.522800 | 43.28 |
x | Hydriding capacity at 8 MPa, w(%) | Plateau pressure/MPa | Hydrogen capacity at 8 MPa, w(%) | Hydrogen capacity at 0.1 MPa, w(%) | △H 0—/ (kJ·mol-1 H2) | △S 0—/(J· K-1·mol-1 H2) | Hf | Sf | ||
---|---|---|---|---|---|---|---|---|---|---|
The 1st cycle | The 3rd cycle | Abs. | Des. | |||||||
0 | 1.522 | 1.271 | 0.173 | 0.052 | 1.024 | 0.603 | -38.26 | 96.29 | 0.52 | 3.66 |
0.25 | 1.485 | 1.119 | 0.218 | 0.037 | 0.983 | 0.573 | -35.80 | 108.10 | 0.77 | 4.52 |
0.50 | 1.530 | 1.389 | 0.026 | 0.009 | 1.418 | 1.122 | -34.25 | 77.22 | 0.46 | 1.10 |
0.67 | 1.442 | 1.444 | 0.054 | 0.031 | 1.425 | 1.128 | -33.75 | 91.59 | 0.24 | 1.66 |
0.75 | 1.489 | 1.434 | 0.044 | 0.033 | 1.435 | 1.216 | -34.19 | 78.11 | 0.12 | 0.88 |
0.85 | 1.528 | 1.513 | 0.094 | 0.046 | 1.490 | 0.804 | -33.10 | 80.12 | 0.32 | 1.26 |
1.00 | 1.465 | 1.444 | 0.097 | 0.057 | 1.432 | 0.749 | -32.91 | 79.21 | 0.22 | 1.59 |
Table 3 Hydriding absorption and hydrogen storage thermodynamic properties of the La1-xYxNi3.25Mn0.15Al0.1 alloys
x | Hydriding capacity at 8 MPa, w(%) | Plateau pressure/MPa | Hydrogen capacity at 8 MPa, w(%) | Hydrogen capacity at 0.1 MPa, w(%) | △H 0—/ (kJ·mol-1 H2) | △S 0—/(J· K-1·mol-1 H2) | Hf | Sf | ||
---|---|---|---|---|---|---|---|---|---|---|
The 1st cycle | The 3rd cycle | Abs. | Des. | |||||||
0 | 1.522 | 1.271 | 0.173 | 0.052 | 1.024 | 0.603 | -38.26 | 96.29 | 0.52 | 3.66 |
0.25 | 1.485 | 1.119 | 0.218 | 0.037 | 0.983 | 0.573 | -35.80 | 108.10 | 0.77 | 4.52 |
0.50 | 1.530 | 1.389 | 0.026 | 0.009 | 1.418 | 1.122 | -34.25 | 77.22 | 0.46 | 1.10 |
0.67 | 1.442 | 1.444 | 0.054 | 0.031 | 1.425 | 1.128 | -33.75 | 91.59 | 0.24 | 1.66 |
0.75 | 1.489 | 1.434 | 0.044 | 0.033 | 1.435 | 1.216 | -34.19 | 78.11 | 0.12 | 0.88 |
0.85 | 1.528 | 1.513 | 0.094 | 0.046 | 1.490 | 0.804 | -33.10 | 80.12 | 0.32 | 1.26 |
1.00 | 1.465 | 1.444 | 0.097 | 0.057 | 1.432 | 0.749 | -32.91 | 79.21 | 0.22 | 1.59 |
x | Na | Cmax(mA·h/g) | S100(%) | HRD900(%) | I0/ (mA·g-1) | 1010D0/ (cm2·s-1) | Ecorr/V | icorr/ (mA·cm-2) | |
---|---|---|---|---|---|---|---|---|---|
60 mA/g | 300 mA/g | ||||||||
0 | 2 | 211.3 | 152.3 | 92.1 | 64.5 | 321.8 | 0.91 | -0.916 | 6.69 |
0.25 | 2 | 184.2 | 137.6 | 95.5 | 74.4 | 267.9 | 1.01 | -0.919 | 6.57 |
0.50 | 1 | 376.1 | 340.6 | 75.6 | 75.6 | 249.0 | 1.32 | -0.915 | 6.74 |
0.67 | 2 | 376.3 | 335.3 | 85.1 | 83.4 | 248.3 | 1.71 | -0.912 | 5.81 |
0.75 | 1 | 381.6 | 347.2 | 80.3 | 85.7 | 274.3 | 2.56 | -0.912 | 6.29 |
0.85 | 2 | 350.4 | 297.5 | 52.6 | 75.4 | 235.4 | 1.58 | -0.927 | 8.75 |
1.00 | 1 | 307.2 | 164.1 | 22.1 | 68.1 | 51.9 | 0.94 | -0.935 | 8.74 |
Table 4 Electrochemical properties of La1-xYxNi3.25Mn0.15Al0.1 alloy electrodes
x | Na | Cmax(mA·h/g) | S100(%) | HRD900(%) | I0/ (mA·g-1) | 1010D0/ (cm2·s-1) | Ecorr/V | icorr/ (mA·cm-2) | |
---|---|---|---|---|---|---|---|---|---|
60 mA/g | 300 mA/g | ||||||||
0 | 2 | 211.3 | 152.3 | 92.1 | 64.5 | 321.8 | 0.91 | -0.916 | 6.69 |
0.25 | 2 | 184.2 | 137.6 | 95.5 | 74.4 | 267.9 | 1.01 | -0.919 | 6.57 |
0.50 | 1 | 376.1 | 340.6 | 75.6 | 75.6 | 249.0 | 1.32 | -0.915 | 6.74 |
0.67 | 2 | 376.3 | 335.3 | 85.1 | 83.4 | 248.3 | 1.71 | -0.912 | 5.81 |
0.75 | 1 | 381.6 | 347.2 | 80.3 | 85.7 | 274.3 | 2.56 | -0.912 | 6.29 |
0.85 | 2 | 350.4 | 297.5 | 52.6 | 75.4 | 235.4 | 1.58 | -0.927 | 8.75 |
1.00 | 1 | 307.2 | 164.1 | 22.1 | 68.1 | 51.9 | 0.94 | -0.935 | 8.74 |
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