Fast and Anisotropic Proton Conduction in a Crystalline Polyphosphate
Fast and Anisotropic Proton Conduction in a Crystalline Polyphosphate
复制标题
结晶聚磷酸盐中的快速且各向异性质子传导
DOI：
10.1021/jp5105642
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
T. Uda
中科院分区：
文献类型：
--
作者：
Naoyuki Hatada;K. Toyoura;T. Onishi;Yoshinobu Adachi;T. Uda
多磷酸镧（LaP 3 O 9）具有较高的质子导电性，是燃料电池电解质的理想选择。然而，LaP 3 O 9中的质子传导机制（即，质子传输途径及其与晶体结构的关系）仍然知之甚少;因此，没有明确的增强电导率的策略。研究表明，在LaP_3O_9的晶格结构中，质子传导的快速各向异性通道沿着B-和c-轴存在，通过控制电解质膜的微观结构可以显著提高质子传导率。第一性原理计算表明，质子仅沿着PO 4链中特定氧离子的近邻迁移，导致电导率各向异性，这一点用Sr掺杂的LaP 3 O 9单晶很容易证实.采用溶液合成法制备的Sr掺杂LaP 3 O 9多晶膜具有明显的c轴取向性和晶粒粗大性。
Lanthanum polyphosphate (LaP3O9) is an attractive candidate for the electrolytes in fuel cells because of its relatively high proton conductivity. However, the proton conduction mechanism in LaP3O9 (i.e., proton transport pathways and its relationship with the crystal structure) still remains poorly understood; thus, there has been no clear strategy for enhancing the conductivity. In this paper, we show that the fast and anisotropic proton conduction pathways exist along the b- and c-axes in the crystal lattice of LaP3O9, and the proton conductivity can be remarkably improved by controlling the microstructure of the electrolyte membranes. The first-principles calculations reveal that protons migrate only along the neighbors of specific oxide ions in the PO4 chains, leading to the conductivity anisotropy, which is readily confirmed using Sr-doped LaP3O9 single crystals. The c-axis oriented, coarse-grained polycrystalline membranes of Sr-doped LaP3O9 prepared by solution synthesis techniques exhibit markedl...
Sr 掺杂 LaP309 的高温质子传导
DOI：
--
发表时间：
2006
期刊：
Solid State Ionics 177
影响因子：
--
作者：
K.Amezawa;et al.
通讯作者：
et al.