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Updated: Jul 20, 2025

Improved Heterojunction Quality in Cu2O-based Solar Cells Through the Optimization of Atmospheric Pressure Spatial Atomic Layer Deposited Zn1-xMgxO

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Restraining Interfacial Cu²⁺ by using Amorphous SnO₂ as Sacrificial Protection Boosts CO₂ Electroreduction.

Binbin Jia¹, Lidong Li¹, Chuang Xue²

¹School of Chemistry, Beihang University, Beijing, 100191, China.

Advanced Materials (Deerfield Beach, Fla.)

|August 7, 2023

Summary

A new catalyst stabilizes copper (Cu) during electrochemical carbon dioxide reduction (CO2 RR) to formate. This sacrificial protection strategy using tin oxide (SnO2) significantly enhances selectivity, activity, and stability for energy applications.

Keywords:

CO2 electroreduction amorphous materials interfaces sacrificial protection

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Area of Science:

Electrochemistry
Materials Science
Catalysis

Background:

Electrochemical carbon dioxide reduction (CO2 RR) to formate is crucial for energy conversion.
Copper-based catalysts are promising but suffer from instability (Cu2+ reduction) at high potentials.
This instability limits selectivity, activity, and catalyst longevity.

Purpose of the Study:

To develop a strategy for stabilizing copper electrocatalysts during CO2 RR.
To enhance the selectivity, activity, and stability of CO2 RR to formate.
To investigate the mechanism of catalyst stabilization and improved performance.

Main Methods:

Development of a hybrid catalyst: crystalline CuO embedded with amorphous SnO2 (c-CuO/a-SnO2).
Utilized in situ X-ray absorption spectroscopy (XAS) and X-ray diffraction for characterization.
Performed theoretical calculations and electrochemical performance testing.

Main Results:

The c-CuO/a-SnO2 catalyst achieved 96.7% Faradaic efficiency (FE) for formate production.
Attained a high current density exceeding 1 A cm-2, surpassing industrial benchmarks.
Demonstrated significantly improved selectivity, activity, and stability compared to conventional Cu catalysts.

Conclusions:

The amorphous SnO2 effectively stabilizes interfacial Cu2+ via electronic interactions, preventing reduction.
The hybrid interface lowers the energy barrier for the rate-limiting step in CO2 RR.
This sacrificial protection strategy offers a promising pathway for highly efficient CO2 conversion catalysts.