Cobalt-substituted SrTi0.3Fe0.7O3−δ: a stable high-performance oxygen electrode material for intermediate-temperature solid oxide electrochemical cells†,Energy & Environmental Science

当前位置： X-MOL 学术 › Energy Environ. Sci. › 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.)

Cobalt-substituted SrTi0.3Fe0.7O3−δ: a stable high-performance oxygen electrode material for intermediate-temperature solid oxide electrochemical cells†
Energy & Environmental Science ( IF 32.4 ) Pub Date : 2018-05-09 00:00:00 , DOI: 10.1039/c8ee00449h
Shan-Lin Zhang _{1,

2,

3,

4,

5} , Hongqian Wang _{1,

2,

3,

4} , Matthew Y. Lu _{1,

2,

3,

4} , Ai-Ping Zhang _{5,

6,

7,

8,

9} , Liliana V. Mogni _{10,

11,

12,

13} , Qinyuan Liu _{1,

2,

3,

4} , Cheng-Xin Li _{5,

6,

7,

8,

9} , Chang-Jiu Li _{5,

6,

7,

8,

9} , Scott A. Barnett _{1,

2,

3,

4}

Affiliation

A key need in the development of solid oxide cells (SOCs) is for electrodes that promote fast oxygen reduction and oxygen evolution reactions at reduced operating temperature (≤700 °C), with sufficient durability to allow operation over desired 40 000 h lifetimes. A wide range of electrode materials have been investigated, with some providing resistance low enough for cell operation below 700 °C, but it is generally found that the electrode performance degrades over time. Here we demonstrate an oxygen electrode material, Sr(Ti_0.3Fe_0.7−xCo_x)O_3−δ (STFC), that provides a unique combination of excellent oxygen electrode performance and long-term stability. The addition of a relatively small amount of Co to Sr(Ti_0.3Fe_0.7)O_3−δ, e.g., x = 0.07, reduces the electrode polarization resistance by >2 times. The STFC electrode yields stable performance in both fuel cell and electrolysis modes at 1 A cm⁻². The fundamental oxygen diffusion and surface exchange coefficients of STFC are determined, and shown to be substantially better than those of La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ, the most widely used SOC oxygen electrode material. While other electrode materials have been shown to exhibit better oxygen transport coefficients than STFC, they do not match its stability.

中文翻译：

钴取代的SrTi _0.3 Fe _0.7 O _{3− δ}：用于中温固体氧化物电化学电池的稳定的高性能氧电极材料†

固体氧化物电池（SOC）的开发的关键需求是在降低的工作温度（≤700°C）下能促进快速的氧气还原和氧气析出反应的电极，并具有足够的耐久性以使其在期望的40 000 h的使用寿命内工作。已经研究了各种各样的电极材料，其中一些材料提供的电阻足够低，可用于低于700°C的电池操作，但是通常发现电极性能会随着时间而下降。在这里，我们证明氧电极材料，SR（钛_0.3的Fe _{0.7- X}钴_X）O _{3- δ}（STFC），其提供优异的氧电极的性能和长期稳定性的独特组合。在Sr（Ti）中添加相对少量的Co_0.3的Fe_0.7）O_{3- δ}，例如， X = 0.07，减少了由> 2倍的电极极化电阻。STFC电极在1 A cm^-2的燃料电池和电解模式下均具有稳定的性能。确定了STFC的基本氧扩散系数和表面交换系数，显示出比最广泛使用的SOC氧电极材料La_0.6 Sr_0.4 Co_0.2 Fe_0.8 O_{3- δ}更好的结果。尽管其他电极材料已显示出比STFC更好的氧传输系数，但它们不符合其稳定性。

更新日期：2018-05-09

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11