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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

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Pressure regulated CO₂ electrolysis on two-dimensional Bi₂O₂Se.

Ruofan Sun¹, Jiwu Zhao¹, Hang Liu¹

¹Division of Physical Science and Engineering (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Kingdom of Saudi Arabia.

Chemical Communications (Cambridge, England)

|January 10, 2025

Summary

A novel 2D bismuth oxy-selenide catalyst efficiently converts carbon dioxide (CO2) to formate. High pressure significantly boosts selectivity and current density for sustainable CO2 utilization.

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Area of Science:

Materials Science
Electrochemistry
Catalysis

Background:

Electrochemical reduction of carbon dioxide (CO2RR) is promising for sustainable production and climate change mitigation.
Current limitations include high catalyst costs, low selectivity, and poor current density.
Renewable energy integration is key for CO2RR viability.

Purpose of the Study:

To develop a cost-effective, high-performance catalyst for CO2RR.
To investigate the effect of pressure on CO2RR performance.
To elucidate the reaction mechanisms using advanced characterization.

Main Methods:

Chemical vapor deposition (CVD) for synthesizing 2D Bi2O2Se.
Electrochemical testing to evaluate catalyst performance (Faradaic efficiency, current density).
In situ Raman spectroscopy and Density Functional Theory (DFT) calculations for mechanistic studies.

Main Results:

The 2D Bi2O2Se catalyst achieved 47.1% formate Faradaic efficiency at 4649 mA mg-1.
Performance significantly surpassed bulk Bi2O2Se.
Increasing CO2 pressure from 1.01 to 40 bar enhanced formate selectivity and current density (up to 7457 mA mg-1).

Conclusions:

Low-mass-loading 2D Bi2O2Se is a highly effective catalyst for CO2RR.
High pressure is a critical factor for optimizing CO2RR selectivity and industrial applicability.
This work demonstrates potential for sustainable CO2 conversion under industrially relevant conditions.