Early View e202511546
Research Article

Asymmetric, Corner-Sharing CuO5 and CuO6 Motifs in Cu-Based Metallic Perovskite Oxides Boosting Asymmetric C─C Coupling for CO2 Electroreduction to C2+

Yu Zhang

Yu Zhang

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

University of Chinese Academy of Sciences, Beijing, 100049 P.R. China

These authors contributed equally to this work.

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Hongyan Zhao

Hongyan Zhao

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

These authors contributed equally to this work.

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Junjie Zhu

Junjie Zhu

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

Joint International Research Laboratory of Biomass Energy and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037 P.R. China

These authors contributed equally to this work.

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Zitao Chen

Zitao Chen

South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou, 510006 P.R. China

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Xiangjian Liu

Xiangjian Liu

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

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Zhenbao Zhang

Zhenbao Zhang

School of Chemistry and Chemical Engineering, Linyi University, Linyi, 276005 P.R. China

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Lei Shi

Lei Shi

Joint International Research Laboratory of Biomass Energy and Materials, College of Materials Science and Engineering, Nanjing Forestry University, Nanjing, 210037 P.R. China

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Xuezeng Tian

Xuezeng Tian

School of Physics, Sun Yat-sen University, Guangzhou, 510275 P.R. China

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Heqing Jiang

Heqing Jiang

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

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Yongfa Zhu

Yongfa Zhu

Department of Chemistry, Tsinghua University, Beijing, 100084 P.R. China

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Jiawei Zhu

Corresponding Author

Jiawei Zhu

State Key Laboratory of Photoelectric Conversion and Utilization of Solar Energy, Qingdao New Energy Shandong Laboratory, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101 P.R. China

E-mail: [email protected]

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First published: 30 June 2025

Graphical Abstract

A unique type of Cu-based metallic perovskite oxides with asymmetric, corner-sharing CuO5 and CuO6 motifs were reported to promote asymmetric C─C coupling for efficient CO2-to-C2+ conversion. As a proof-of-concept catalyst, La0.8Ba0.2CuO3-δ was the most effective Cu-based-perovskite catalyst for C2+ production and performed comparably with or better than most reported Cu-based catalysts.

Abstract

Cu-based perovskite oxides feature significant potential for CO2 electroreduction (CO2RR) but encounter insufficient C2+ selectivity primarily due to the inherent symmetric charge distribution at Cu sites hindering asymmetric C─C coupling. Here we report a unique type of Cu-based metallic perovskite oxides with asymmetric, corner-sharing CuO5 and CuO6 motifs to boost asymmetric C─C coupling for efficient CO2-to-C2+ conversion. For the proof-of-concept catalyst of La0.8Ba0.2CuO3-δ, their ordered, corner-sharing CuO5 pyramids and CuO6 octahedra feature localized charge density redistribution, creating abundant asymmetric Cu─Cu dual sites with distinct electronic structures and also strengthening Cu─O covalency. In CO2RR (in both alkaline and acidic media), La0.8Ba0.2CuO3-δ greatly promotes C2+ formation while producing negligible CH4, showing a Faradaic efficiency ratio (C2+ to CH4) of up to 180. Moreover, La0.8Ba0.2CuO3-δ, achieving a remarkable C2+ Faradaic efficiency of 85.0% at 400 mA cm−2, together with well-boosted stability, outperforms previously reported Cu-based-perovskite catalysts. Our experiments and theoretical calculations attribute the superb performance mainly to the following factors: the asymmetric CuO5─CuO6 sites promoting differentiated *CO adsorption/hydrogenation to favor asymmetric *CO─*CHO coupling; the strengthened Cu─O covalency stabilizing the Cu sites. Extending this strategy to two additional pairs of Cu-based perovskite oxides generates similarly successful results.

Conflict of Interests

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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