CTAB (Hexadecyltrimethylammonium bromide, >99%) Powder as Electrolyte Additive for CO2 Electroreduction (CO2RR), CCO2RREACTAB
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In electrochemical CO2 reduction (CO2RR), Cetyltrimethylammonium bromide (CTAB) is a cationic surfactant used as an electrolyte additive to fundamentally alter the electrode-electrolyte interface. Its primary role is to suppress the competing Hydrogen Evolution Reaction (HER) while simultaneously enhancing the rate and selectivity of CO2 reduction.
CTAB operates through several distinct bi-functional mechanisms at the catalyst surface: (1) Interfacial Water Reorganization: CTAB molecules adsorb onto the cathode surface via their cationic headgroups. This hydrophobic "barrier" displaces water molecules from the Helmholtz layer (the region closest to the electrode). Since water is the primary source of protons for the HER, its displacement significantly inhibits hydrogen production. (2) Intermediate Stabilization: The positively charged quaternary ammonium headgroup of CTAB creates a local electric field that stabilizes polar CO2RR intermediates, such as the *CO2'- radical or *COOH. This lowers the overpotential required for the first electron transfer. (3) Hydrophobic Microenvironment: The long alkyl chains of CTAB create a "dry" micro-environment. This increases the local concentration of gaseous CO2 at the catalyst surface by preventing it from being converted into inactive (bi)carbonates as quickly as it would in bulk aqueous electrolyte.
| Part Number |
CCO2RREACTAB (C-CO2RR-EA-CTAB) |
| CAS |
57-09-0 |
| Chemical Formula/Structure |
CH3(CH2)15N(Br)(CH3)3
 |
| Appearance |
White powder |
| Molecular Weight |
364.45 |
| CTAB on Cu Catalyst |
It shifts selectivity toward Formate (HCOO-) or C2 products. |
| CTAB on Ag Catalyst |
It will massively enhances Carbon Monoxide (CO) production. |
| Package Grade |
100 g/bottle (other package sizes, such as 500 g, 1 kg can be supplied upon request) |
References
(1）S. Banerjee, et al., Modulating the Electrode–Electrolyte Interface with Cationic Surfactants in Carbon Dioxide Reduction, ACS Catal. 2019, 9, 6, 5631–5637.
(2) S. Banerjee, et al., Surfactant Perturbation of Cation Interactions at the Electrode–Electrolyte Interface in Carbon Dioxide Reduction,ACS Catal. 2020, 10, 17, 9907–9914.