在Ir-Mn间金属中强异原子键诱导的局限重组使稳健的PEM水电解器成为可能
Shuang Wang1, Yan Shi2, Tao Shen1
1Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology), Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P. R. China.
原子排序策略增强了在质子交换膜 (PEM) 水电解中高效氧化演化反应 (OER) 的-催化剂,提高了稳定性并降低了成本.
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:
- 低电催化剂对于质子交换膜 (PEM) 水电解的氧化演化反应 (OER) 是至关重要的.
- 控制基于的催化剂在现场重建以获得更好的动力学是一个重大挑战.
研究的目的:
- 开发一个原子排序策略,以调节催化剂表面重组,克服活动/稳定性权衡.
- 在-金属间催化剂 (IMC) 上设计自稳定无形 (氧) 氧化物,以提高OER性能.
主要方法:
- 在Ir-Mn金属间 (IMC) 模型上利用了原子排序策略.
- 员工在现场/现场表征和理论分析的结合.
- 研究了局限于表面的重建和 heteroatom 结合效应.
主要成果:
- 该策略诱导了合理的表面重建,形成自我稳定的无形 (氧) 氧化物.
- 强大的Ir-O-Mn共价单元削弱了OOH*形成屏障,促进了H2O转化,抑制了晶格氧气参与.
- 一个具有Ir-Mn IMC的PEM电池在1.851V (80°C) 达到3.0A/cm2,在2.0A/cm2稳定运行超过2000小时.
结论:
- 原子排序策略有效地打破了OER电催化剂中的活动/稳定性权衡.
- 伊尔-Mn IMC在PEM水电解中显示出有前途的应用,降低了生产成本.
- 突出了强的异质原子键触发的局限于表面的进化对于催化剂设计的重要性.
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