过渡金属单个原子在Mo2C上,用于增强氧化反应的MXenes:密度功能理论研究
Lianming Zhao1, Yizhu Wang1, Tao Ding1
1Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, Shandong 266580, China. lmzhao@upc.edu.cn.
我们探索了离子交换膜燃料电池 (AEMFC) 的无催化剂. 在Mo2C (Ru-Mo2C) 上的单个原子显示出异常的氧化反应 (HOR) 活性和稳定性,指导着未来的催化剂设计.
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
- 计算化学的计算化学
背景情况:
- 性离子交换膜燃料电池 (AEMFC) 是一个有前途的能量转换装置.
- 用于氧化反应 (HOR) 的高效,无的电催化剂对于AEMFC的发展至关重要,但很少.
研究的目的:
- 系统地研究由Mo2C (TM-Mo2C) 支持的过渡金属单个原子的HOR催化性能,使用第一原理密度函数理论 (DFT) 计算.
- 为AEMFCs确定有前途的无HOR电催化剂.
主要方法:
- 密度函数理论 (DFT) 的计算被用来研究在Mo2C基板上支持的过渡金属单个原子 (Fe,Co,Ni,Cu,Zn,Ru,Rh,Pd,Ag,Ir,Pt).
- 分析电子结构调制,双活性位点 (TM和相邻的Mo原子) 以及关键HOR中间体 (H*和OH*) 的吸附自由能量.
主要成果:
- 过渡金属原子与Mo2C基板的集成调节了电子结构,并创建了双重活性位点,优化了HOR活动.
- 在催化活性和H*和OH*的吸附自由能量之间观察到火山形的关系.
- 在Mo2C (Ru-Mo2C) 上支的对HOR具有超低的自由能量障碍,由于平衡的H*和OH*吸附,其表现优越.
结论:
- Ru-Mo2C表现出极好的催化活性和稳定性,使其成为AEMFC非常有前途的无HOR催化剂.
- 这项研究为设计用于AEMFC应用的高效,稳定和成本效益的无Pt电催化剂提供了理论指导.
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