All-carbon microporous graphitic photocatalyst-promoted reduction of CO2 to CO in the absence of metals or dopant elements

Abstract

[EN] Microporous graphitic carbon (mp-C) derived from the pyrolysis of alpha-, beta-, and gamma-cyclodextrins exhibited photocatalytic activity in CO2-saturated acetonitrile-water upon irradiation with UV-Vis light and in the presence of triethanolamine, forming H-2 (19 mu mol h(-1)) and CO (23 mu mol h(-1)) accompanied by a lesser proportion of CH4 (4 mu mol h(-1)). The most efficient was the mp-C material derived from alpha-cyclodextrin (mp-C-alpha) and having a pore dimension of 0.68 nm. The process also occured, although to a much lesser extent, under simulated sunlight or with UV-Vis irradiation in the absence of a sacrificial agent, with H2O being the electron donor. The origin of the CO was proved by isotopic C-13 labelling experiments. Photocurrent measurements proved the occurrence of charge separation and the increase in photocurrent intensity in the presence of CO2. Transient absorption spectroscopy was used to detect the charge separate state decay in the microsecond time scale and proved that a fraction of the photogenerated electrons were able to react with CO2.