当前位置: X-MOL 学术J. Solid State Chem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
High electrical conductivity and crystal structure of the solid oxide cell electrode Pr4Ni3O10
Journal of Solid State Chemistry ( IF 3.2 ) Pub Date : 2020-06-25 , DOI: 10.1016/j.jssc.2020.121533
Chen-Yu Tsai , Ainara Aguadero , Stephen J. Skinner

Pr4Ni3O10 is a promising air electrode for solid oxide fuel cells and electrolysers with comparable performance to Pr2NiO4+δ but with improved thermodynamic stability at a cell operating temperature of 600 °C–800 °C. To fully understand and integrate Pr4Ni3O10 into commercial devices there are several aspects that remain to be addressed. This study provides a systematic analysis of the synthesis kinetics, crystal structure, oxygen content and electrical conductivity providing clear paths for the development of Pr4Ni3O10-based low temperature solid oxide electrochemical devices with enhanced performance and stability. We prove that the material can reach a remarkable electrical conductivity of 235 Scm-1 at 700 °C in air, much higher than the previously reported values of 86 Scm-1 and 56 Scm-1, rising to 278 Scm-1 at 450 °C. High resolution neutron powder and in-situ X-ray diffraction confirmed that Pr4Ni3O10 crystallises in the monoclinic P21/a space group, and that no phase transitions were observed on heating to 1000 °C in air. An electrical conductivity anomaly was found at ∼300 °C and is attributed to a subtle change in the local structure of the material, potentially associated with changes in the oxygen content.



中文翻译:

固体氧化物电池电极Pr 4 Ni 3 O 10的高导电性和晶体结构

Pr 4 Ni 3 O 10是一种有前景的用于固体氧化物燃料电池和电解槽的空气电极,其性能可与Pr 2 NiO 4 +δ媲美,但在600°C–800°C的电池工作温度下具有改善的热力学稳定性。为了完全理解并将Pr 4 Ni 3 O 10集成到商业设备中,还有几个方面有待解决。这项研究提供了对合成动力学,晶体结构,氧含量和电导率的系统分析,为开发Pr 4 Ni 3 O 10提供了清晰的途径。基低温固态氧化物电化学装置,具有增强的性能和稳定性。我们证明了该材料在700°C的空气中可达到235 Scm -1的卓越电导率,远高于先前报道的86 Scm -1和56 Scm -1的电导率,在450°C时可升至278 Scm -1 C。高分辨率中子粉末和原位X射线衍射证实,Pr 4 Ni 3 O 10在单斜晶P 2 1 / a中结晶空间组,并且在空气中加热至1000°C时未观察到相变。在约300°C时发现电导率异常,这归因于材料局部结构的细微变化,这可能与氧含量的变化有关。

更新日期:2020-06-25
down
wechat
bug