作为可见光减少二氧化碳的有效光催化剂,单个原子 (Pd/Pt) 支持石墨碳化物
Guoping Gao1, Yan Jiao2, Eric R Waclawik1
1School of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology , Garden Point Campus, Brisbane, QLD 4001, Australia.
Journal of the American Chemical Society
|April 27, 2016
概括
石墨碳化物上的单个和原子有效地利用太阳能将二氧化碳 (CO2) 转化为燃料. 这些新的光催化剂显示出可见光吸收的增强,
科学领域:
- 材料科学
- 催化剂
- 可再生能源
背景情况:
- 太阳能转化为燃料对于储能和碳平衡至关重要.
- 二氧化碳 (CO2) 的光催化降低提供了碳化合物燃料的可持续途径.
- 石墨碳化物 (g-C3N4) 是光催化的一个有前途的材料.
研究的目的:
- 在g-C3N4上研究单个 (Pd) 和 (Pt) 原子作为减少CO2的新型光催化剂.
- 使用 Pd/g-C3N4 和 Pt/g-C3N4 确定催化活性和首选的二氧化碳减排产物.
- 探索g-C3N4在减少二氧化碳反应中提供 (H*) 的作用.
主要方法:
- 用密度功能理论 (DFT) 的计算来研究光催化机制.
- 分析了Pd/g-C3N4和Pt/g-C3N4的电子和结构特性.
- 计算了减少二氧化碳的反应途径和能量障碍.
主要成果:
- 在g-C3N4上单个Pd和Pt原子作为减少CO2的活性位点.
- Pd/g-C3N4可将二氧化碳降解为具有低能障碍的酸 (HCOOH).
- Pt/g-C3N4有利于将二氧化碳减少为具有更高能量屏障的甲 (CH4).
- 与原始的g-C3N4相比,光催化剂的可见光吸收能力提高.
结论:
- 单原子催化剂 (Pd/g-C3N4和Pt/g-C3N4) 对于太阳能驱动的二氧化碳减排非常有效.
- 金属原子的选择影响了产品的选择性 (HCOOH与CH4).
- 这些发现提出了将二氧化碳转化为有价值的燃料的新策略,有助于可再生能源的发展.
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