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Acidic electroreduction CO2 to formic acid via interfacial modification of Bi nanoparticles at industrial-level current.
- Source :
- Nano Research; Jul2024, Vol. 17 Issue 7, p5817-5825, 9p
- Publication Year :
- 2024
-
Abstract
- Electrocatalytic CO<subscript>2</subscript> reduction reaction (CO<subscript>2</subscript>RR) in acidic media is a promising approach to overcome the unavoidable formation of carbonates in alkaline or neutral electrolytes. However, the proton-rich environment near the catalyst surface favors hydrogen evolution reactions (HER), leading to lower energy efficiency of the desired products, especially in industrial-level current densities. Here, quaternary ammonium cationic surfactant (cetyltrimethylammonium bromide (CTAB)) was introduced into acidic electrolyte to modulate the interfacial microenvironment, which greatly enhanced CO<subscript>2</subscript> electroreduction to formic acid (HCOOH) at the Bi/C nanoparticles electrode. Using a Bi/C nanoparticles electrode with CTAB added, constant production of formic acid was enabled with a cathodic energy efficiency of > 40% and maximum FE<subscript>HCOOH</subscript> (FE = Faradaic efficiency) of 86.2% at −400 mA·cm<superscript>−2</superscript> over 24 h. Combined with in-situ attenuated total reflection Fourier transform infrared spectroscopy, the concentration of *OCHO intermediates significantly increased after CTAB modification, confirming that the hydrophobic interface microenvironment formed by dynamic adsorption of positively charged long alkyl chains on Bi/C nanoparticle electrodes inhibited HER and improved the selectivity of CO<subscript>2</subscript>RR to HCOOH. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 19980124
- Volume :
- 17
- Issue :
- 7
- Database :
- Complementary Index
- Journal :
- Nano Research
- Publication Type :
- Academic Journal
- Accession number :
- 178276858
- Full Text :
- https://doi.org/10.1007/s12274-024-6536-2