通过结构修改有机酸盐,增强对氧和进化反应的双功能电催化活动的内在特异性活动
Poojita1, Tanmay Rom1,2, Rathindranath Biswas3
1Department of Chemistry, National Institute of Technology Kurukshetra, Kurukshetra 136119, Haryana, India.
Inorganic chemistry
|February 9, 2024
概括
合成了两种新的金属有机酸盐化合物,并作为氧和演化反应的电催化剂进行了测试. 与化合物I和RuO2相比,化合物II具有3D结构与pyrazine,表现出优越的双功能电催化活性和稳定性.
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
- 无机化学 无机化学 有机化学
背景情况:
- 开发高效的多功能电催化剂需要了解框架材料的结构-活性关系.
- 金属有机酸盐由于其可调节的结构和特性,是电催化剂的有希望的候选物.
研究的目的:
- 合成和描述两种具有不同结构维度的新金属有机酸盐化合物.
- 评估这些化合物的氧化演化反应 (OER) 和演化反应 (HER) 的电催化性能.
- 研究结构维度和辅助连接体对电催化活性和稳定性的影响.
主要方法:
- 两种基于的有机酸盐化合物[Ni(Hhedp) 2]·4H2O (I) 和[Ni3(H3hedp) 2(C4H4N2) 3]·6H2O (II) 的单热水合成,使用H4hedp和pyrazine.
- 通过单晶X射线衍射来确定结构,揭示1D链 (I) 和3D扩展 (II) 结构.
- 在性和酸性介质中对OER和HER的电催化性能评估,使用RuO2作为基准.
主要成果:
- 与化合物I和RuO2相比,化合物II对OER (η10 = 305 mV) 和HER (η10 = 230 mV) 的电催化性能优越.
- 化合物II对OER的特异活性是化合物I (0.16 mA/cm2) 的四倍 (0.64 mA/cm2).
- 3D结构和将pyrazine纳入化合物II显著提高了双功能电催化性能和长期稳定性.
结论:
- 金属有机酸盐的维度和连接体设计在它们的电催化活性和稳定性中起着至关重要的作用.
- 化合物II代表了OER和HER的高效和稳定的双功能电催化剂.
- 这项研究强调了混合框架材料在先进能源应用中的潜力.
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