Solvent effects on the morphology and performance of the anode substrates for solid oxide fuel cells
Solvent effects on the morphology and performance of the anode substrates for solid oxide fuel cells
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溶剂对固体氧化物燃料电池阳极基材形貌和性能的影响
DOI：
10.1016/j.jpowsour.2017.07.110
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发表时间：
2017
影响因子：
9.2
通讯作者：
Chen Fanglin
中科院分区：
文献类型：
--
作者：
Liu Tong;Ren Cong;Zhang Yanxiang;Wang Yao;Lei Libin;Chen Fanglin
系统地评价了溶剂对阳极衬底微观结构的影响以及各自电池的电化学性能。利用溶解度参数解释了相变浆液的流变性能与阳极基质孔隙形成机理之间的关系。当选择n -甲基-2-吡咯烷酮（NMP）作为溶剂时，获得了具有分层取向孔的双层阳极衬底，而以二甲基亚砜（DMSO）为溶剂则获得了海绵状均匀阳极衬底，表明溶剂是影响阳极衬底微观结构的关键因素。利用扫描电镜和x射线显微镜对NMP制备的阳极衬底的二维和三维微观结构进行了分析。制备了具有不同微观结构阳极衬底的固体氧化物燃料电池（SOFCs），通过将阳极衬底从均匀的海绵状结构改变为双层结构，最大功率密度从320.3 mWcm−2显著提高到719.2 mWcm−2，表明手指状的大孔洞层有利于H2-H2O的质量扩散。而薄的海绵状孔隙层可以作为阳极功能层，为h2氧化提供足够的活性反应位点。该研究表明，NMP是一种很有前途的溶剂，可用于制备高性能sofc的分层定向阳极。
Solvents effects on the microstructure of anode substrates as well as the electrochemical performance of the respective cells are systematically evaluated. The solubility parameters are used to interpret the relationship between the rheological properties of phase inversion slurries and pore formation mechanism of the anode substrates. When N-methyl-2-pyrrolidone (NMP) is chosen as the solvent, a dual-layered anode substrates with hierarchically oriented pores is achieved, while a sponge-like homogeneous anode substrate is obtained using dimethyl sulfoxide (DMSO) as the solvent, indicating that solvent is a key factor to affect the anode substrate microstructure. Two-dimensional and three-dimensional microstructures of the anode substrates prepared using NMP are analyzed by scanning electron microscopy and X-ray microscopy, respectively. Solid oxide fuel cells (SOFCs) with different microstructured anode substrates are prepared, and the maximum power density is significantly enhanced from 320.3 to 719.2 mWcm−2by varying the anode substrate from homogeneous sponge-like microstructure to dual-layered microstructure, revealing that the finger-like macro-voids layer can facilitate H2-H2O mass diffusion, while the thin sponge-like pores layer can serve as anode functional layer and provide sufficient active reaction sites for H2oxidation. This study demonstrates that NMP is a promising solvent to fabricate hierarchically oriented anode for high-performance SOFCs application.