从[NiFe]酶到Ni2P (001) 表面的气演变的催化剂:整体效应的重要性
1Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973, USA.
Journal of the American Chemical Society
|October 20, 2005
概括
密度函数理论揭示了Ni(2) P作为进化反应 (HER) 的优质催化剂. 它的独特特性增强了HER活性,超过了其他测试的催化剂,如[NiFe]酶和Pt.
科学领域:
- 催化剂是一种催化剂.
- 计算化学计算化学
- 材料科学 材料科学 材料科学
背景情况:
- 进化反应 (HER) 对于可持续的能源生产至关重要.
- 为 HER 开发高效和成本效益的催化剂是一个关键的挑战.
- 了解原子层次的催化剂机制对于设计改进材料至关重要.
研究的目的:
- 为了研究各种系统的催化活性,用于演化反应 (HER).
- 为了比较分子复合体和HER表面的性能.
- 阐明在不同催化位点控制 HER 动力学的基本机制.
主要方法:
- 进行了密度函数理论 (DFT) 的计算.
- 在[NiFe]酶,[Ni(PS3*) ((CO) ] ((1))) 和[Ni(PNP) ((2))) ((2+) 复合体上研究了HER动力学.
- 在Ni{111},Pt{111}和Ni{2) P{001}表面评估了HER的活性.
主要成果:
- [NiFe]酶显示了最高的HER活性,其次是[Ni(PNP) ((2)) ((2+) > Ni(2) P > [Ni(PS3*) ((CO) ] ((1))) > Pt > Ni.
- 在Ni(2) P(001) 表面上强结合导致位点中毒,提高HER率.
- 2P表现出热稳定性和催化活性的平衡,使其成为一个有希望的实际催化剂.
结论:
- 在研究的系统中,Ni(2) P成为HER最有前途的实际催化剂.
- 尼2P的增强活性归因于包括中度结合和P位点的直接参与的合并效应.
- DFT计算为高效气生产的催化剂设计提供了宝贵的见解.
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