对于N2还原反应的石墨烯支持过渡金属单原子催化剂的理论选
Min Li1, Qinglong Fang1,2,3, Xumei Zhao1
1School of Science, Xi'an Polytechnic University, Xi'an 710048, Shaanxi, China. qinglong_fang@xpu.edu.cn.
开发高效的电催化剂用于降解反应 (NRR) 是氨合成的关键. 这项研究将石墨烯上的过渡金属确定为有前途的催化剂,为环境氨生产提供了一种新的选方法.
科学领域:
- 材料科学 材料科学 材料科学
- 催化剂是一种催化剂.
- 计算化学计算化学
背景情况:
- 电催化降解反应 (NRR) 在环境条件下为氨 (NH) 合成提供了一个可持续的途径.
- 在这个领域,开发具有成本效益和高效率的电催化剂仍然是一个重大挑战.
- 支持二维材料的过渡金属催化剂正在积极探索NRR应用.
研究的目的:
- 通过密度函数理论 (DFT) 计算,系统地研究在单层石墨烯 (GY) 上支的各种过渡金属的电催化降解反应 (NRR) 活性.
- 确定具有高NRR性能和选择性的特定过渡金属-石墨烯 (TM@GY) 系统.
- 建立一个计算选策略,用于发现用于环境氨合成的新型电催化剂.
主要方法:
- 密度函数理论 (DFT) 的计算被用来模拟和分析不同TM@GY结构上的NRR机制.
- 计算的重点是确定在石墨烯上支持的各种过渡金属 (Sc-Cu,Y-Ag,Hf-Au) 上的能量,反应途径 (例如混合,远程) 和NRR的限制潜力.
- 评估了有前途的TM@GY候选人的催化活性和选择性.
主要成果:
- 几种TM@GY系统,特别是在graphyne上支持的Sc,V,Mn,Y,Tc和Os,表现出极好的NRR性能.
- 混合途径被发现是Sc,V,Y和Os@GY最有利的,其超电位较低 (分别为-0.37,-0.27,-0.40,-0.36V).
- Mn和Tc@GY倾向于偏远路径 (-0.37, -0.42 V),而Mn,Tc和Os@GY表现出特别高的NRR选择性.
结论:
- 在单层石墨烯上支持的过渡金属是降解反应的非常有前途的电催化剂.
- 特定的TM@GY系统,如Mn,Tc和Os@GY,在环境条件下显示出高效和选择性氨合成的潜力.
- 这种基于DFT的选方法为识别电化学NRR的未来高性能电催化剂提供了一个有价值的方案.
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