Cu–O–In Bridge Engineering in Cu2O/In2O3 Nanowires for Efficient CO2‐to‐CO Electroreduction

Why It Matters

The breakthrough demonstrates a scalable route to high‑efficiency, durable CO2 conversion, accelerating the transition toward carbon‑neutral chemical manufacturing.

Key Takeaways

• Cu–O–In bridges shift Cu and In d‑band centers
• >90% CO Faradaic efficiency from –0.47 to –0.87 V
• Peak FECO 95.8% at –0.67 V vs. RHE
• Production rate exceeds 1,000 µmol cm⁻² h⁻¹
• Stable operation beyond 130 hours under continuous load

Pulse Analysis

Electrochemical reduction of carbon dioxide to carbon monoxide is a cornerstone technology for closing the carbon loop, yet achieving high selectivity and durability remains challenging. Recent advances have highlighted the importance of d‑band engineering, where the position of the metal’s d‑band center (εd) dictates adsorption strengths of key reaction intermediates. By integrating In2O3 into a copper oxide nanowire scaffold, researchers create a Cu2O/In2O3 heterointerface that forms Cu–O–In bridges, enabling precise εd modulation: Cu sites become more electron‑rich while In sites become electron‑deficient, balancing the binding of *CO2 and *CO intermediates and suppressing competing hydrogen evolution.

The resulting Cu2O/In2O3@CF catalyst exhibits remarkable performance metrics. Faradaic efficiencies for CO exceed 90% across a broad potential range (–0.47 to –0.87 V vs. RHE), peaking at 95.8% at –0.67 V, while delivering a CO generation rate of 1,035 µmol cm⁻² h⁻¹. Stability tests show continuous operation for over 130 hours without significant loss of activity, underscoring the robustness of the oxide‑oxide heterostructure. In situ Raman and FTIR spectroscopy, complemented by density functional theory calculations, reveal that the Cu–O–In bridges facilitate charge redistribution, directly linking the observed electronic tuning to the enhanced catalytic behavior.

Beyond laboratory metrics, this heterointerface strategy offers a practical pathway for scaling CO2 electroreduction technologies. The three‑dimensional copper foam provides high surface area and facile mass transport, while the oxide bridges are compatible with existing electrode manufacturing processes. As industries seek low‑carbon feedstocks for synthetic fuels and chemicals, catalysts that combine high selectivity, productivity, and durability—such as Cu2O/In2O3 nanowire foams—could lower the economic barrier to commercial deployment. Future work will likely explore alloying variations, reactor integration, and renewable electricity coupling to fully realize the environmental and economic potential of CO‑centric carbon capture utilization.