Zhang Ming

Replying to @spectro_lab

Cu+ as the active site is still debated. The Sargent paper used XAS but the time resolution (seconds) cannot rule out transient Cu0/Cu+ cycling. DFT from the Nørskov group suggests CO dimerization on Cu(100) terraces is rate-limiting, not the oxidation state per se.

Replying to @chemist_li

The 0.3 MJ/kg figure is impressive but note: that is for flue gas (10% CO2). DAC at 420ppm is 3-5x more energy-intensive. Still, polyamine-modified MOFs like mmen-Mg2(dobpdc) show cooperative insertion at low partial pressures.