动态旋转控制三金属单原子催化剂中不对称的协调场,以实现最佳的氧降低
Kexin Song1, Binbin Yang1, Wengang An2
1Key Laboratory of Automobile Materials Ministry of Education, School of Materials Science & Engineering, Electron Microscopy Center, Changbaishan Laboratory, International Center of Future Science, Jilin University, Changchun, 130012, P.R. China.
我们为三金属单原子催化剂开发了一种"动态旋转工程"策略,提高氧降解反应 (ORR) 的性能和稳定性. 这种方法通过在催化剂中实现动态重建和自旋状态转换来优化质子合电子转移 (PCET).
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:
- 单原子催化剂 (SAC) 在氧降解反应 (ORR) 动力学方面具有理论上的优势.
- SACs的有限动态适应性挑战了多步质子合电子转移 (PCET).
- 需要先进的催化剂设计,以平衡活性和稳定性.
研究的目的:
- 为设计新型三金属单原子催化剂 (FeZnTM-TACs) 引入"动态旋转工程"战略.
- 研究这些催化剂在ORR中的性能和稳定性.
- 阐明动态重建,电荷补偿和旋转状态转换的基本机制.
主要方法:
- 设计和合成具有不对称协调场的三金属单原子催化剂 (FeZnTM-TACs).
- 电化学描述ORR性能和稳定性.
- 操作X射线吸收细结构 (XAFS) 和自旋极化密度函数理论 (DFT) 的计算.
主要成果:
- 优化的FeZnMn-TAC实现了卓越的ORR性能 (E1/2 = 0.93V与RHE) 和超长时间的稳定性 (ΔE1/2 = 24mV在9万次循环后).
- 证明了三元协同作用,包括动态重建,电荷补偿和旋转状态过渡.
- 揭示了动态FeNxCy进化,触发了自旋状态从中旋转到低旋转的过渡,优化了*OOH形成和*OH脱落.
结论:
- "动态旋转工程"战略使自适应电催化剂的合理设计成为可能.
- 建立了由动态重建驱动的旋转再分配的原子层次理解.
- 这项工作为开发具有统一高活性和运行稳定的电催化剂提供了新的范式.
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