电荷对二维材料电化学反应的重大影响
Donghoon Kim1, Jianjian Shi1, Yuanyue Liu1
1Texas Materials Institute and Department of Mechanical Engineering , The University of Texas at Austin , Austin , Texas 78712 , United States.
Journal of the American Chemical Society
|June 30, 2018
概括
电荷效应对二维电催化剂产生重大影响,例如水分裂. 与3D金属不同,充电的2D材料由于电子状态的变化,反应能量的变化更大.
科学领域:
- 材料科学
- 电化学
- 计算化学
背景情况:
- 二维 (2D) 材料是水分裂等关键反应的有希望的电催化剂.
- 目前的模拟通常忽略了催化剂的充电,假设中立性是为了简单.
- 现实世界中的电催化需要充电的催化剂来调整费米电平与电极电位.
研究的目的:
- 研究电荷对二维电催化剂的影响.
- 将电荷对二维材料的影响与传统的三维金属催化剂进行比较.
- 为设计改进的二维电催化剂提供准则.
主要方法:
- 使用大规范密度函数理论 (DFT).
- 在N-化石墨烯和MoS2 (2D) 和3D金属催化剂上研究了吸附.
- 分析了电荷引起的变化对电子状态的作用.
主要成果:
- 电荷效应显著改变二维材料的反应能量 (>1 eV),远远超过三维金属的反应能量.
- 对二维材料的明显影响来自电荷诱导的电子状态的有限密度的变化.
- 证明电荷对N-化石墨烯和MoS2的吸附有显著影响.
结论:
- 在二维材料电催化中,催化剂充电至关重要,不能被忽视.
- 对二维材料的现有催化机制进行重新评估是必要的,包括充电效应.
- 了解电荷效应为设计更高效的二维电催化剂提供了途径.
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