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电子缓冲机制提高了CeO₂@NiFe-LDH的稳定性和水氧化效率

Junyu Shi¹, Dandan Wang¹, Yun Liang¹

¹Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, College of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai, 200090, China.

Chemistry (Weinheim an der Bergstrasse, Germany)

|December 24, 2024

概括

这项研究引入了一种新的CeO2@NiFe LDH催化剂,可以显著增强氧进化反应. 新材料在性海水中表现出卓越的性能和稳定性,克服了以前的局限性.

科学领域:

电化学电化学电化学
材料科学材料科学材料科学
催化剂是一种催化剂.

背景情况:

铁层双氧化物 (NiFe LDH) 显示出氧化演化反应 (OER) 的前景.
发展受到低导电性和低循环稳定性的限制.
高效的OER电催化剂对于能源转换技术至关重要.

研究的目的:

合成和描述一个层次结构的CeO2@NiFe LDH异构结构催化剂.
评估新催化剂在各种性电解质,包括模拟和实际海水中的OER性能和稳定性.
阐明CeO2在提高NiFe LDH的催化活性和耐久性方面的作用.

主要方法:

CeO2@NiFe LDH异构的热水合成.
电化学表征包括在1M KOH中100 mA cm-2的超电位测量,模拟的性海水和实际的性海水.
在模拟的性海水中在高电流密度下进行长期稳定性测试 (200小时).
在现场拉曼光谱分析活跃物种.

主要成果:

CeO2@NiFe LDH催化剂实现了较低的超电位:在1M KOH中达到255mV,在模拟的性海水中达到263mV,在100mA cm-2.2的实际性海水中达到346mV.
催化剂表现出极好的稳定性,在模拟性海水中连续运行200小时后没有显著的形态变化.
加入CeO2优化了中间结合能,并促进了活跃物种的产生,这在现场拉曼分析中得到证实.

结论:

CeO2@NiFe LDH异构显著提高了OER的催化性能和耐用性.
CeO2 在增强 NiFe LDH 的电催化活性和稳定性方面起着关键作用,以促进氧的演变.
这项工作突出了开发用于海水能源应用的先进电催化剂的有希望的战略.

关键词:

这就是CeO2 .电子缓冲机制的电子缓冲机制异构结构异构结构尼菲氧化氧化 (NiFe oxyhydroxide) 是一种氧化.氧的演化反应反应的反应.

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