研究目的
To study the current efficiency of carbonates for ethanol oxidation reactions in alkaline media by designing a novel on-line electrochemical transmission infrared spectroscopy system.
研究成果
The novel ETIRS system with a Nafion membrane achieves near 100% collection efficiency for carbonates in alkaline media, enabling accurate current efficiency studies. Higher temperatures increase the current efficiency of carbonate formation during EOR on Pt/C, similar to trends in acidic media, with temperature being a key factor rather than oxidation potential.
研究不足
The system may be affected by volatilization of intermediates at higher temperatures, leading to fluctuations in concentration and reduced regularity in absorbance measurements. It is specific to alkaline media and may not be directly applicable to other conditions.
1：Experimental Design and Method Selection:
A new ETIRS system was designed with a cation-exchange membrane (Nafion) in the sampling hood to confine carbonates and improve collection efficiency. The system includes an electrolyte-flowing sampling electrode and a transmission IR cell connected by a peristaltic pump.
2：Sample Selection and Data Sources:
Samples included sodium carbonate, sodium acetate, ethanol, aldehyde, and Pt/C catalysts. Data were obtained from transmission IR spectra and electrochemical measurements.
3：List of Experimental Equipment and Materials:
Equipment includes a CHI600 electrochemical workstation, Nicolet6700 FTIR spectrometer, peristaltic pump, and various reagents. Materials include Nafion membrane, carbon paper, CaF2 windows, and chemicals from suppliers.
4：Experimental Procedures and Operational Workflow:
For CO stripping, CO was adsorbed on Pt/C, then oxidized while monitoring with IR. For EOR, potential steps were applied at different temperatures, and IR spectra were recorded.
5：Data Analysis Methods:
Quantitative analysis used standard curves for carbonate concentration, with molar absorption coefficients. Current efficiency was calculated using charge integrals from electrochemical and IR data.
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