破解矿阳极中的离子排序以增强高温氧气演化反应活动
Lina Yu1, Xueyu Hu2, Yige Guo1,3
1State Key Laboratory of Catalysis, Dalian National Laboratory for Clean Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.
Journal of the American Chemical Society
|July 21, 2025
概括
矿阳极中的离子排序对固体氧化物电解细胞 (SOEC) 产生重大影响. 通过改善离子运输和降低阻力,这种疾病可以提高氧化演化反应 (OER) 的性能.
科学领域:
- 材料科学
- 电化学
- 固态化学
背景情况:
- 矿氧化物对于高温应用至关重要,例如固体氧化物电解电池 (SOEC).
- 矿中的离子排序会影响磁性,电子性,离子性和介电性.
- 矿是SOEC中氧化演化反应 (OER) 的常见阳极,但离子排序对OER活性的影响尚不清楚.
研究的目的:
- 研究A位点离子排序对PrxB a2-xCo2O5+δ矿阳极的OER活性的影响.
- 与电子结构和离子导电性的变化相关联的离子顺序变化.
- 通过控制离子排序来优化SOEC阳极性能.
主要方法:
- 具有不同Pr含量的PrxBa2-xCo2O5+δ矿的合成和表征 (x=1.0至1.5).
- 综合材料特性 (例如结构性,光谱性).
- 密度函数理论 (DFT) 计算以了解电子结构和结合.
- 在SOEC中对阳极性能进行电化学测试,包括阻抗光谱.
主要成果:
- 在PrxB中的A位点离子排序a2-xCo2O5+δ随着Pr含量增加,从有序转变为无序.
- 顺序-混乱过渡增强了d-p轨道杂交,改善了氧气交换和离子运输.
- 失序的Pr1.5Ba0.5Co2O5+δ阳极显示出减少的欧姆电阻和极化电阻.
- 在1.6V和800°C时达到2.29Acm-2的优异OER性能.
结论:
- 矿阳极中的离子排序极大地影响了SOEC的性能.
- 无序的矿结构通过改进的电子和离子传输增强了OER活动.
- 这项研究提供了通过控制离子排序来设计先进的SOEC阳极材料的见解.
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