操纵铜单原子催化剂的局部协调可以实现高效的CO2排放
Yizhou Dai1,2, Huan Li3,4, Chuanhao Wang1,2
1Hefei National Research Center for Physical Sciences at the Microscale, University of Science and Technology of China, 230026, Hefei, Anhui, P. R. China.
这项研究引入了添加铜催化剂,用于高效的电化学二氧化碳转化为甲,这是可再生能源储存和利用的关键步骤.
科学领域:
- 电化学 电化学 电化学
- 催化剂是一种催化剂.
- 材料科学 材料科学 材料科学
背景情况:
- 电化学CO2转化为甲提供可再生能源储能和CO2利用.
- 基于铜的单原子催化剂通过防止C-C合,显示出产生甲的潜力.
研究的目的:
- 研究兴奋剂对二氧化碳电还原到甲的铜 (Cu-N) 单原子催化剂的理论和实验效应.
- 通过优化中间结合,提高甲选择性和生产率.
主要方法:
- 使用密度函数理论 (DFT) 分析中间结合能量的理论研究.
- 通过联合兴奋剂策略制造兴奋铜- (Cu-NxBy) 催化剂.
- 电化学表征包括法拉戴效率和部分电流密度测量.
- 使用二维反应相图和屏障计算进行计算分析.
主要成果:
- 理论计算表明,被纳入Cu-N4基因中,有助于CO*和CHO*的结合,有利于产生甲.
- 在合成的催化剂中,主要的活性位点被确定为Cu-N2B2.2.
- 与未使用剂的Cu-N4基因相比,B-剂的Cu-Nx催化剂表现出更高的性能.
- 在-1.46V与RHE相比,甲的峰值法拉第效率为73%,在-1.94V与RHE相比,甲的最大部分电流密度为-462mA cm-2.
结论:
- 在Cu-Nx单原子催化剂中的兴奋剂显著提高了电化学CO2转化为甲的选择性和活性.
- 该Cu-N2B2地点被确定为甲生产的高效活跃中心.
- 这项工作为有效的可再生能源储存和碳利用提供了对催化剂设计的见解.
更多相关视频
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
10:19Synthesis and Testing of Supported Pt-Cu Solid Solution Nanoparticle Catalysts for Propane Dehydrogenation
Published on: July 18, 2017
相关概念视频
Reduction of Alkenes: Catalytic Hydrogenation
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Catalysis
