The atmospheric CO2 concentration increased from ~320 ppm in 1960 to ~415 ppm in 2021, and the global CO2 emission in 2021is ~35 billion metric tons. The atmospheric CO2 concentration will keep rising because it is extremely challenging to render our economy carbon neutral. According to Paris Agreement, CO2 emission needs to be cut to 55% by 2030 and finally become net zero in 2050. To reduce CO2 emissions, one promising way is to use it as the carbon source for chemicals and materials. Tremendous efforts have been devoted to the electrocatalytic conversion of CO2 to feedstock chemicals, such as CO and ethylene. We developed a general coordination-condensation strategy to prepare single-atom metal active sites on ordered mesoporous carbon (OMC). We prepared metal on OMC catalysts using Fe, Co, Ni, Cu, Pt, Pd, Ru, and Rh, in which the Ni/OMC showed 95% Faradaic efficiency in CO2 electrocatalytic reduction to carbon monoxide (CO). Even under &gt;140 mA cm-2 current density, suitable for large-scale applications, the high Faradaic efficiency to CO is maintained during a 14-hour test. We further developed efficient hybrid catalysts that can further convert CO to C2 molecules.

Electrochemical CO2 reduction by single-atom metal sites supported on ordered mesoporous carbon

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