对于化物间的石墨化合物来说,增强了吸附度.
Hansong Cheng1, Xianwei Sha, Liang Chen
1Air Products and Chemicals, Inc., 7201 Hamilton Boulevard, Allentown, Pennsylvania 18195, USA. Chengh@airproducts.com
Journal of the American Chemical Society
|November 26, 2009
概括
研究人员探索了化石中的 (H2) 储存,发现由于C-F键在室温下吸附更强. 虽然容量有限,但兴奋剂可以增强未来的H2储存材料.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 化学工程是化学工程的重要组成部分.
背景情况:
- (H2) 储存对于清洁能源技术至关重要.
- 多孔碳材料被广泛研究为H2吸附.
- 需要在接近环境温度时增强H2相互作用的新材料.
研究的目的:
- 为了研究部分化石墨中的物理吸收.
- 了解H2与化石墨之间的相互作用机制.
- 评估这种材料在储应用中的潜力.
主要方法:
- Ab initio分子动力学模拟用于理论预测.
- 化石墨的实验合成和表征.
- 在接近环境温度的吸附测量的同位热.
主要成果:
- 与传统的多孔碳相比,部分化石墨对H2具有显著更高的异质吸附热.
- 增强的相互作用归因于碳- (C-F) 键的半离子性质.
- 预计由于当前的吸附热量,在室温下高H2储量 (>4重量%) 是不可行的.
结论:
- 部分化石墨代表了一类新型的接受型石墨间化合物.
- 这种C-F键相互作用为更强的H2吸附提供了一条途径.
- 兴奋剂策略可能通过促进电荷转移来增强H2储存特性.
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