A recent study has demonstrated a successful molecular modification method to enhance platinum (Pt) surfaces for the electrocatalytic reduction of CO2 to methane (CH4), while inhibiting hydrogen evolution reactions (HER). Typically, copper-based materials excel in CO2 reduction reactions (CO2RR) but suffer from stability issues in acidic environments. In comparison, Pt shows remarkable stability in both acidic and alkaline conditions but is hindered by its high HER activity. Researchers addressed these limitations by developing composite materials with metal-doped molecules that improve the interface properties, increasing reactant contact and optimizing the adsorption of important intermediates.
Professor He’s team utilized a molecular doping strategy to encapsulate thionine (Th) molecules within Pt nanocrystals, resulting in the PtNPs@Th catalyst. This modification significantly alters the activity of Pt, suppressing HER while enhancing CO2RR performance in both strongly and weakly acidic solutions. The PtNPs@Th catalyst exhibits impressive stability, maintaining catalytic performance for over 100 hours in acidic media. This study provides valuable insights into the potential of molecularly modified reaction interfaces for improved electrocatalysis, paving the way for more efficient CO2 conversion methods.
