Abstract
In recent years, the use of inexpensive and efficient catalysts for the electrocatalytic CO(2) reduction reaction (CO(2)RR) to regulate syngas ratios has become a hot research topic. Here, a series of nitrogen-doped iron carbide catalysts loaded onto reduced graphene oxide (N-Fe(3)C/rGO-H) were prepared by pyrolysis of iron oleate, etching, and nitrogen-doped carbonization. The main products of the N-Fe(3)C/rGO-H electrocatalytic reduction of CO(2) are CO and H(2), when tested in a 0.5 M KHCO(3) electrolyte at room temperature and pressure. In the prepared catalysts, the high selectivity (the Faraday efficiency of CO was 40.8%, at -0.3 V), and the total current density reaches ~29.1 mA/cm(2) at -1.0 V as demonstrated when the mass ratio of Fe(3)O(4) NPs to rGO was equal to 100, the nitrogen doping temperature was 800 °C and the ratio of syngas during the reduction process was controlled by the applied potential (-0.2~-1.0 V) in the range of 1 to 20. This study provides an opportunity to develop nonprecious metals for the electrocatalytic CO(2) reduction reaction preparation of synthesis and gas provides a good reference.