期刊
CHEMOSPHERE
卷 301, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2022.134704
关键词
Electrochemical reduction of CO2; Electrodeposition; Tin-on-Cu foam; Polyethyleneimine; Formate
资金
- Beijing Forestry University Outstanding Young Talent Cultivation Project [2019JQ03007]
- National Natural Science Foundation of China [52070015, 21872009]
- Beijing Municipal Education Commission through the Innovative Transdisciplinary Program Ecological Restoration Engineering [GJJXK210102]
A novel catalytic cathode of PEI-Sn/Cu foam with dendritic structure was prepared for electrocatalytic reduction of CO2 to HCOOH, showing high efficiency and stability. The results provide a promising strategy for developing efficient catalysts for CO2 electroreduction.
In this work, a novel catalytic cathode of polyethyleneimine (PEI)-Sn/Cu foam with dendritic structure was prepared by electrodeposition and impregnation. It was used in the electrocatalytic reduction of CO2 to HCOOH, and its performance in this process was evaluated. At -0.97 V vs. RHE, the faradaic efficiency and current density reached 92.3% and 57.1 mA cm(-2), respectively, in a 0.5 M KHCO3 electrolyte. The HCOOH production rate reached 890.4 mu mol h(-1) cm(-2), which exceeds those for most reported Sn catalysts. Density functional theory calculations showed that use of Sn/Cu foam is more conducive to HCOOH formation than use of Cu or Sn alone, and *OCHO is the main intermediate in HCOOH formation. The results of OH- adsorption experiments confirmed that the introduction of PEI enhanced the catalytic capacity of the Sn/Cu foam, stabilized CO2 center dot- intermediates, and promoted HCOOH generation. These results will provide an attractive strategy for developing efficient catalysts with excellent activities and stabilities for CO2 electroreduction.
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