酸子迁移诱导的晶格氧氧化在脊柱氧化物中,用于高氧演化反应
Mahmoud G Ahmed1, Ying Fan Tay2, Xiao Chi3
1School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Angewandte Chemie (International ed. in English)
|November 11, 2024
概括
这项研究引入了一种新的螺旋氧化物催化剂 (Fe0.3Co0.9Cr1.8O4),通过激活晶格氧来增强氧化演化反应 (OER) 动力学和稳定性. 催化剂的性能优于二氧化,为高效的电催化提供了一个有希望的途径.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
背景情况:
- 激活晶格氧增强氧演变反应 (OER) 动力学,但通常会损害催化剂的稳定性.
- 散装结构退化是限制活性晶格氧催化剂性能的一个常见问题.
研究的目的:
- 开发一种具有增强OER活性和稳定的新型氧化催化剂.
- 研究晶格氧化激活的机制及其对催化剂性能的影响.
主要方法:
- 使用高通量合成方法发现了旋Fe0.3Co0.9Cr1.8O4催化剂.
- 进行了电化学测量,以评估OER活性和稳定性.
- 使用了先进的表征技术,包括软X射线吸收光谱,拉曼光谱和18O同位素标记实验.
主要成果:
- 与基准Iro2.2相比,开发的螺旋氧化物催化剂表现出优异的OER活性和稳定性.
- 在10 mA cm-2下达到190 mV的超低电位,在100 mA cm-2下超过170小时实现了显著的稳定性.
- 氧化被确定为晶格氧化激活的驱动力,涉及离子迁移和可访问的非结合氧态的形成.
结论:
- 由Cr氧化和离子迁移驱动的晶格氧化激活,可实现高效和稳定的OER催化.
- 通过Cr6+形成和稳定过氧O-O键,有助于增强催化性能.
- 这项研究提出了一种新的策略,用于设计强大的和活跃的晶格氧催化剂,而不会造成结构性降解.
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