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Open research questions in CO2 Reduction Techniques and Catalysts

31 unresolved questions extracted from the limitations and future-work sections of 414 CO2 Reduction Techniques and Catalysts papers in our library. Each links back to the study that raised it.

What the literature leaves open

  • Future research should focus on developing dual‐functional POPs capable of simultaneous CO 2 capture and conversion, improving electrical conductivity, and establishing scalable and cost‐effective fabrication strategies.

    Porous Organic Polymers for CO <sub>2</sub> Capture and Electroreduction: Recent Advances and Future Perspectives · 2026 · DOI

  • Zhang et al. Micro Nano Sci. 2026, 1, 9 Page 5 of 7 Figure 2. Future roadmap and closed-loop framework for ML-driven design of intelligent CO2RR catalysts. ML: Machine learning; CO2RR: carbon dioxide reduction. Despite the rapid progress achieved in ML-assisted CO2RR research in recent years, several critical issues still need to be addressed before ML can evolve from a high-throughput screening tool into a mechanism-driven catalyst design platform. First, the central challenge lies not merely in the limited amount of data, but in the persistent mismatch among data quality, descriptor consistency, and realistic electrochemical operating conditions. A large portion of existing data is derived either from idealized computational models or from experimental systems operated under substantially different conditions, which greatly limits the transferability of models across different catalyst classes and reaction environments. Second, a common misconception in this field is to equate improved predictive accuracy with deeper mechanistic understanding. In reality, without explicit physical constraints and interfacial environmental information, even highly accurate models may capture only correlations rather than revealing the underlying causal mechanisms. Third, future development should move beyond isolated prediction tasks toward a closed-loop research framework integrating standardized databases, physics-informed and interpretable machine learning, realistic electrochemical interface modeling, and automated experimental validation. In our view, such an integrated strategy represents a key route for transforming machine learning from a data-driven acceleration tool into a more reliable and insightful research platform for catalyst discovery and mechanistic understanding in CO2RR. DECLARATIONS Authors’ contributions Conceived the research: Zhang, Y.; Li, J. Wrote the manuscript: Zhang, Y. Supervised the research and revised the manuscript: Zhang, Z. Page 6 of 7 Zhang et al. Micro Nano Sci.

    Harnessing machine learning for electrochemical CO<sub>2</sub> reduction: current progress and future perspectives · 2026 · DOI

  • The resulting catalyst delivers efficient alkaline HER and, importantly, sustains hydrogen evolution deep into the high‐current‐density regime with strong operational durability, addressing a key limitation of many PtNi‐based catalysts commonly evaluated only at low currents.

    One‐pot synthesis of <scp>PtNi</scp> /carbon composites derived from polytetrahydrofuran for bifunctional alkaline <scp>HER</scp> and <scp>ORR</scp> · 2026 · DOI

  • ABSTRACT Electrochemical CO 2 reduction (eCO 2 RR) is increasingly capable of delivering downstream‐compatible carbon products, yet the interfacial origin of pathway selection remains insufficiently understood.

    Coordination‐Engineered Interfacial Pathway Partitioning for Electrocatalytic CO <sub>2</sub> Conversion and Downstream Upgrading · 2026 · DOI

  • However, how different types of Re elements affect the key C–C coupling steps remains unclear, and as a result, RE–Cu dual‐site catalysts often face challenges due to the lack of definitive design guidelines.

    CO Adsorption Energy Match at Dual Sites Drives C–C Coupling Activity in Rare Earth–Cu CO <sub>2</sub> Reduction Catalysts · 2026 · DOI

  • The synergetic effects of indium nodes and BDC ligands on catalyst morphology and electrochemical performance require deeper mechanistic understanding beyond the current EIS and Tafel analysis.

    Indium-based Metal Organic Frameworks (In-MOFs) for Electrochemical Reduction of Carbon Dioxide to Formate · 2026 · DOI

  • Most reported electrocatalysts for CO2 reduction are indium alloys, oxides, or sulphides rather than metal organic frameworks; effective utilisation of indium nodes and polyaromatic ligands for pristine In-MOFs requires further development for large-scale application.

    Indium-based Metal Organic Frameworks (In-MOFs) for Electrochemical Reduction of Carbon Dioxide to Formate · 2026 · DOI

  • Water management is crucial in the MEA electrolyser without catholyte, but few studies have clarified whether the co-feeding water in cathode can enhance C2+ formation.

    Roles of copper(I) in water-promoted CO2 electrolysis to multi-carbon compounds · 2024 · DOI

  • However, the impact of MEA configuration on the inevitable reconstruction of Cu catalysts during CO2RR remains underexplored, despite its considerable potential to affect CO2RR efficacy.

    Exploring the influence of cell configurations on Cu catalyst reconstruction during CO2 electroreduction · 2024 · DOI

  • Alkali metal cations (M + ), as a vital component at the interface, are found to be necessary for the initiation of carbon dioxide reduction reaction (CO 2 RR) on coinage metals, and the activity and selectivity of CO 2 RR could be further enhanced with the cation changing from Li + to Cs + , while the underlying mechanisms are not well understood.

    Molecular understanding of the critical role of alkali metal cations in initiating CO2 electroreduction on Cu(100) surface · 2024 · DOI

  • We first examine chemical oxidation using an open-circuit potential (OCP), identifying that copper oxidation is regulated by the transient behavior of the OCP curve and limited by the rate of the oxygen reduction reaction (ORR).

    Interrogation of Oxidative Pulsed Methods for the Stabilization of Copper Electrodes for CO<sub>2</sub> Electrolysis · 2024 · DOI

  • Nevertheless, limited by the unstable structure and states of catalysts under electrochemical conditions, electroreduction of CO2 to formate is still facing a trade-off between activity and stability, especially at high current densities.

    Beyond Leverage in Activity and Stability toward CO<sub>2</sub> Electroreduction to Formate over a Bismuth Catalyst · 2024 · DOI

  • Abstract The production of formic acid via electrochemical CO 2 reduction may serve as a key link for the carbon cycle in the formic acid economy, yet its practical feasibility is largely limited by the quantity and concentration of the product.

    Concentrated Formic Acid from CO<sub>2</sub> Electrolysis for Directly Driving Fuel Cell · 2024 · DOI

  • However, its reaction rate is severely limited by the slow CO 2 diffusion due to the absence of hydroxide that facilitates the CO 2 diffusion in an acidic environment.

    Gas diffusion enhanced electrode with ultrathin superhydrophobic macropore structure for acidic CO2 electroreduction · 2024 · DOI

  • A considerable number of MOFs have been identified as highly versatile electrocatalytic CO2RR. Recent advancements have introduced a range of innovative strategies to enhance the electrocatalytic performance of MOFs in CO2RR. candidates for These strategies include the design of MOFs with optimized structural features to increase the density of active sites and improve electron and ion transport. Additionally, the incorporation of functionalized linkers or metal nodes has been explored to elevate catalytic activity. Hybrid materials combining MOFs with other catalysts or conductive materials represent another promising approach. Moreover, advanced synthesis techniques and post-synthesis modifications are employed to fine-tune MOF properties for improved CO2 reduction performance. Collectively, these methods aim to enhance the efficiency and selectivity of CO2 conversion into valuable products, addressing key challenges in the field of electrocatalysis.

    Recent advances and future perspectives of metal-organic frameworks as efficient electrocatalysts for CO2 reduction · 2024 · DOI

  • Abstract Single atom alloy (SAA) catalysts have been recently explored for promotion of various heterogeneous catalysis, but it remains unexplored for selective electrocatalytic reduction of carbon dioxide (CO 2 ) into multi‐carbon (C 2+ ) products involving C−C coupling.

    Single Atom Bi Decorated Copper Alloy Enables C−C Coupling for Electrocatalytic Reduction of CO<sub>2</sub> into C<sub>2+</sub> Products** · 2023 · DOI

  • The design and synthesis of suitable functional ligands are very imperative in the field of catalysis, and the choice of auxiliary ligands may have a huge effect on the structural framework, suggesting need for further ligand optimization studies.

    Indium-based Metal Organic Frameworks (In-MOFs) for Electrochemical Reduction of Carbon Dioxide to Formate · 2026 · DOI

  • However, despite the well-known importance of cations, the impact of pulsed electrolysis on the cation distribution remains unexplored as well as its influences on the performance.

    Dynamic Cation Enrichment during Pulsed CO<sub>2</sub> Electrolysis and the Cation-Promoted Multicarbon Formation · 2024 · DOI

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31 open questions have been extracted from the limitations and future-work passages of 414 CO2 Reduction Techniques and Catalysts papers in our library. Each one below links back to the study that raised it, so you can read the original claim in context.

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