Polyethylenimine-enhanced electrocatalytic reduction of CO₂ to formate at nitrogen-doped carbon nanomaterials

Sheng Zhang, Peng Kang, Stephen Ubnoske, M Kyle Brennaman, Na Song, Ralph L House, Jeffrey T Glass, Thomas J Meyer
Journal of the American Chemical Society 2014 June 4, 136 (22): 7845-8
Nitrogen-doped carbon nanotubes are selective and robust electrocatalysts for CO2 reduction to formate in aqueous media without the use of a metal catalyst. Polyethylenimine (PEI) functions as a co-catalyst by significantly reducing catalytic overpotential and increasing current density and efficiency. The co-catalysis appears to help in stabilizing the singly reduced intermediate CO2(•-) and concentrating CO2 in the PEI overlayer.

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