Formic Acid Electroreduction Pathways on (111) Metal Surfaces

Area of Science:

• Electrochemistry
• Materials Science
• Catalysis

Background:

• Formic acid electroreduction is an understudied area with potential for energy applications.
• Understanding reaction pathways and product selectivity is crucial for catalyst development.

Purpose of the Study:

• Investigate formic acid electroreduction on Cu(111), Au(111), Ag(111), Zn(111), Pt(111), Pd(111), and Ru(111).
• Determine the most likely products and assess catalyst selectivity using theoretical calculations.

Main Methods:

• Density functional theory (DFT) calculations were employed.
• Analysis of four formic acid electroreduction steps on specified metal surfaces.

Main Results:

• Copper (Cu) surfaces allow formation of H2, CO, C2 products, methanol, and methane, but exhibit low selectivity.
• Gold (Au) surfaces show high selectivity for methanol with low hydrogen evolution.
• Silver (Ag) may produce methanol but has a high initial energy barrier; Zinc (Zn) favors methane; Platinum (Pt), Palladium (Pd), and Ruthenium (Ru) risk CO poisoning.

Conclusions:

• Gold (Au) emerges as a promising catalyst for selective methanol production.
• Understanding intermediate adsorption and reaction pathways is key to optimizing formic acid electroreduction.
• DFT provides valuable insights into catalyst performance for energy conversion applications.