Morphological Study of Directionally Freeze-Cast Nickel Foams

被引:39
作者
Jo, Hyungyung [1 ]
Kim, Min Jeong [2 ,3 ]
Choi, Hyelim [1 ]
Sung, Yung-Eun [2 ,3 ]
Choe, Heeman [1 ]
Dunand, David C. [4 ]
机构
[1] Kookmin Univ, Sch Adv Mat Engn, 77 Jeongneung Ro, Seoul 136702, South Korea
[2] Inst for Basic Sci Korea, Ctr Nanoparticle Res, Seoul 151742, South Korea
[3] Seoul Natl Univ, Sch Chem & Biol Engn, Seoul 151742, South Korea
[4] Northwestern Univ, Dept Mat Sci & Engn, Evanston, IL 60208 USA
来源
METALLURGICAL AND MATERIALS TRANSACTIONS E-MATERIALS FOR ENERGY SYSTEMS | 2016年 / 3卷 / 01期
关键词
D O I
10.1007/s40553-016-0068-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Nickel foams, consisting of 51 to 62 pct aligned, elongated pores surrounded by a network of Ni walls, were fabricated by reduction and sintering of directionally cast suspensions of nanometric NiO powders in water. Use of dispersant in the slurry considerably affected the foam morphology and microstructure at both the micro-and macro-scale, most likely by modifying ice solidification into dendrites (creating the aligned, elongated macro-pores) and NiO powder accumulation in the inter-dendritic space (creating the Ni walls with micro-pores). The mean width of the Ni walls, in foams solidified with and without dispersant, was 21 +/- 5 and 75 +/- 13 mu m, respectively. Additionally, the foams with the dispersant showed less dense walls and rougher surfaces than those without the dispersant. Moreover, the fraction of closed pores present in the foam walls with the dispersant was higher than that of the samples without dispersant. We finally verified the potential energy application of the Ni foam produced in this study by carrying out a preliminary single-cell performance test with the Ni foam sample as the gas diffusion layer on the anode side of a polymer electrolyte membrane fuel cell. (C) ASM International (ASM) and The Minerals, Metals & Materials Society (TMS) 2016
引用
收藏
页码:46 / 54
页数:9
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