Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 326, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2022.122185
Keywords
CO 2 reduction reaction; Syngas; Active protons; Ionic liquid; Nano-Ag@Ni foam
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A highly efficient catalytic system for CO2RR to produce syngas is reported using a Ni-foam-supported nano-Ag catalyst in an ionic liquid (IL)-acetonitrile electrolyte. The CO/H2 molar ratio in the syngas can be tuned from 1:5 to 26:1, with high current densities of 363.6, 458.2, and 644.7 mA cm-2 at CO/H2 molar ratios of 1:1, 1:2, and 1:3, respectively. The high efficiency is attributed to the synergistic stabilization action of nano-Ag and IL cationic C4/5-H for intermediate *COO- to produce CO, as well as cationic C2-H contribution to hydrogen evolution. This work opens a new way to improve the catalytic performance of CO2RR to produce syngas.
High current density at specific CO/H2 molar ratios is the key to the industrial application of heterogeneous electrocatalytic CO2 reduction reaction (CO2RR) to syngas, which is still very challenging. Here, we report a Ni-foam-supported nano-Ag catalyst for CO2RR in ionic liquid (IL)-acetonitrile electrolyte originally designed for CO2RR-to-CO. It is surprising to find that this is a highly efficient catalytic system for CO2RR-to-syngas, the CO/ H2 molar ratio in the syngas can be tuned from 1:5-26:1, and the current density is as high as 363.6, 458.2, and 644.7 mA cm-2 at the CO/H2 molar ratios of 1:1, 1:2, and 1:3, respectively. The high efficiency of CO2RR-to-syngas is attributed to the synergistic stabilization action of nano-Ag and IL cationic C4/5-H for intermediate *COO- to produce CO, as well as cationic C2-H contribution to hydrogen evolution. This work opens a new way to improve catalytic performance of CO2RR-to-syngas.
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