Shan Ke, Dastan Davoud, Yi Zhong-Zhou, Mohammed Mustafa K A, Yin Xi-Tao, Timoumi Abdelmajid, Weidenbach Alex S
School of Chemistry and Resource Engineering, Honghe University Yunnan Province 661199 China
Department of Materials Science and Engineering, Cornell University Ithaca NY 14850 USA
RSC Adv. 2023 Mar 15;13(13):8683-8691. doi: 10.1039/d3ra00583f. eCollection 2023 Mar 14.
Perovskite materials play a significant role in oxygen sensors due to their fascinating electrical and ionic conductivities. The sol-gel technique was employed to prepare various compositions of B-site-deficient Fe-doped SrTiO (iron-doped strontium titanate) or Sr(TiFe) O , where = 0.01, 0.02, and 0.03. The XRD results revealed that the principle crystalline phase of the samples was the cubic perovskite structure. The B-site deficiency improved the ionic and total conductivities of Sr(TiFe) O . A small polaron conduction behavior occurred in the total electrical conductivity. The XPS results showed that the oxygen vacancy value decreased with the rise in the amount of B-site deficiencies. A lower B-site deficiency amount could produce more oxygen vacancies in the lattice but resulted in the ordering of vacancies and then lower ionic conductivity. The aging behavior was caused by the ordering of oxygen vacancies and resulted in a degeneration of electrical features under a long service time. Conversely, augmentation of the B-site deficiency amount inhibited the tendency for the ordering of oxygen vacancies and then promoted the electrical performance under a long usage time. The conduction mechanism of oxygen ions through oxygen vacancies was thoroughly investigated and discussed. The current study presents a feasible approach to ameliorate the physical features of conductors through doping the B-site of the perovskite layer with Fe, which would be a fruitful approach for numerous applications, including oxygen sensors and fuel cells anodes.
钙钛矿材料因其迷人的电学和离子导电性在氧传感器中发挥着重要作用。采用溶胶 - 凝胶技术制备了各种B位缺陷的铁掺杂SrTiO（铁掺杂钛酸锶）或Sr(TiFe)O的组合物，其中 = 0.01、0.02和0.03。XRD结果表明，样品的主要晶相为立方钙钛矿结构。B位缺陷提高了Sr(TiFe)O的离子电导率和总电导率。总电导率中出现了小极化子传导行为。XPS结果表明，氧空位值随B位缺陷量的增加而降低。较低的B位缺陷量会在晶格中产生更多的氧空位，但会导致空位有序化，进而降低离子电导率。老化行为是由氧空位有序化引起的，导致在长时间使用下电学性能退化。相反，增加B位缺陷量会抑制氧空位有序化的趋势，进而在长时间使用下提高电学性能。对氧离子通过氧空位的传导机制进行了深入研究和讨论。当前的研究提出了一种通过用铁掺杂钙钛矿层的B位来改善导体物理特性的可行方法，这对于包括氧传感器和燃料电池阳极在内的众多应用将是一种富有成效的方法。
