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不同添加剂介层离子对NiFe-LDH对直接海水分裂的关键作用:理论研究

Lu Wang¹, Ying Wang², Liang Zhou²

¹Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130023, China.

Journal of colloid and interface science

|November 17, 2024

概括

研究人员通过结合离子来优化铁层双氧化物 (NiFe-LDH) 催化剂,用于直接海水电解. 这增强了氧进化反应 (OER) 的活性和选择性,这对于从海水中有效生产至关重要.

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
计算化学的计算化学

背景情况:

直接海水电解为淡水和气生产提供了可持续的解决方案.
挑战包括慢氧演化反应 (OER) 动力学和海水中的氧化反应 (ClOR).
对于OER/ClOR选择性而言,性条件是首选的,但高pH值可能会导致阴极污染 (Mg(OH) 2,Ca(OH) 2).

研究的目的:

研究介层离子 (PO4^3-, SO4^2-, CO3^2-, NO3^-) 对OER的NiFe-LDH特性的影响.
探索电子结构和催化性能之间的关系.
开发具有增强OER活性,选择性和更广泛的pH适用于海水电解的NiFe-LDH催化剂.

主要方法:

使用密度函数理论 (DFT) 的计算.
对OER活动,选择性和pH范围的分析.
电子结构和电荷转移机制的研究.

主要成果:

介层离子显著增强了OER活动和选择性.
使用PO4^3-的NiFe-LDH表现出优异的性能,将OER超电位 (η) 降低到0.29V.
从离子到催化剂的超电位 (η) 和电荷转移 (ΔQtot) 之间发现了线性相关性.

结论:

介层离子可以通过电荷转移有效调节NiFe-LDH的催化活性.
用酸盐修饰的NiFe-LDH对海水中的高效和选择性的OER有希望.
本研究为设计用于直接海水电解的先进电催化剂提供了理论指导.

关键词:

收费转移是指收费转移的情况.具有竞争力的化物氧化反应.密度函数理论密度函数理论直接的海水电解是海水的电解.介层间的离子是介层间的离子.

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