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Marked CO₂ Reduction to Generate C₁-C₃ Products Using Pt_0.9Ru_0.1/C-Based Membrane Electrode Assembly at Extremely Low

Shofu Matsuda¹, Ryu Ishibashi², Minoru Umeda²

¹Department of Frontier Materials Chemistry, Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan.

|March 17, 2025

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This study introduces a novel platinum-ruthenium catalyst for electrochemical CO2 reduction, producing valuable methane, ethanol, and acetone. This breakthrough advances CO2 utilization for carbon neutrality.

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Area of Science:

Electrochemistry
Catalysis
Materials Science

Background:

Electrochemical CO2 reduction (CO2RR) over Pt catalysts primarily yields H2.
Membrane electrode assemblies (MEAs) with Pt/C catalysts improve CO2RR but yield only methane (CH4).

Purpose of the Study:

To investigate the CO2RR using a Pt0.9Ru0.1/C electrocatalyst in an MEA system.
To explore the production of C1, C2, and C3 products from CO2 reduction.

Main Methods:

Utilized a membrane electrode assembly (MEA) with a Pt0.9Ru0.1/C electrocatalyst.
Confirmed product formation using mass spectrometry, gas chromatography, and isotope labeling.
Investigated the reaction mechanism via Langmuir-Hinshelwood kinetics.

Main Results:

Achieved production of methane (CH4), ethanol (C2H5OH), and acetone (CH3COCH3) at low overpotentials.
Reported the first instance of ethanol and acetone production from CO2RR using a Pt-Ru catalyst.
Obtained Faradaic efficiencies of 20.6% for CH4, 5.9% for C2H5OH, and 5.2% for CH3COCH3, totaling 31.7%.

Conclusions:

Pt-Ru/C electrocatalysts enable the selective production of valuable C2+ compounds (ethanol, acetone) alongside CH4.
CO2RR product distribution is governed by the adsorption configuration of CO and C-C coupling via CO clusters.
This research supports CO2 capture, utilization, and storage (CCUS) technologies for carbon neutrality.