Introduction to the results
The electrochemical reduction of carbon dioxide (CO 2 ) to ethanol is a promising strategy for mitigating global warming and resource utilization. However, the conversion of CO2 to ethanol remains a huge challenge with low activity and selectivity due to the complexity of C─C coupling and multiple proton-electron transfers. This article, Nanchang University Professor Wang Jun, Nanyang Technological University Yeng Ming Lam and other researchers published in the journal "Advanced Science" titled "Phosphorus-Doped Graphene Aerogel as Self-Supported Electrocatalyst for CO2-to-Ethanol Conversion" The paper, Research, proposes a P-doped graphene aerogel as a self-supporting electrocatalyst for the reduction of CO to ethanol.
achieves high ethanol Faradaic efficiency (FE) of 48.7% and long-term stability of 70 hours at -0.8V RHE. At the same time, an ethanol yield of 14.62 µmol h -1 cm -2 can be obtained, which is better than most reported electrocatalysts. In situ Raman spectroscopy demonstrates the important role of the adsorbed *CO intermediate in the conversion of CO2 to ethanol. Furthermore, density functional theory calculations revealed possible active sites and optimal pathways for ethanol formation. The zigzag edge of P-doped graphene enhances the adsorption of *CO intermediates, increases the coverage of *CO on the catalyst surface, promotes the dimerization of *CO, and promotes the formation of EtOH. Furthermore, the hierarchical pore structure of P-doped graphene aerogel exposes abundant active sites and promotes mass/charge transfer. This work provides creative insights into the design of -free metal catalysts for CO2 electroreduction liquid products.
Graphical introduction
Figure 1. a) Schematic diagram of the synthesis process. b) SEM image, c) TEM image (inset HR-TEM image), and d) EDS mapping of PGA-2. e) XRD patterns and f) high-resolution XPS spectra of P 2p for all samples.
Figure 2. Electrochemical characterization
Figure 3. a) -dependent and b) time-dependent in situ Raman spectra of potential in CO2-saturated 0.5 M KHCO3 solution on PGA-2.
Figure 4. Top and side views of the local charge density difference between *CO and the basic plate
Literature:
https://doi.org/10.1002/advs.202202006
