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Ultralow‐Overpotential CO Production from Electroreduction of CO2 on a Hydroxyl‐Enriched Heterojunction.

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Title: Ultralow‐Overpotential CO Production from Electroreduction of CO2 on a Hydroxyl‐Enriched Heterojunction.
Authors: Xie, Huan1 (AUTHOR) huanxie@njfu.edu.cn, Zheng, Yan1 (AUTHOR), Nie, Wenzheng1 (AUTHOR), Men, Linglan1 (AUTHOR), Bao, Huihui1 (AUTHOR), Liu, Yingchun1 (AUTHOR), Liu, Chuangwei2,3 (AUTHOR), Liu, Jingwei4 (AUTHOR) liujw@ms.xjb.ac.cn, Xia, Changlei1 (AUTHOR) changlei.xia@njfu.edu.cn
Source: Advanced Energy Materials. 7/1/2026, Vol. 16 Issue 25, p1-12. 12p.
Subject Terms: *Overpotential, *Hydroxyl group, *Electrode efficiency, *Nanostructured materials, *Energy consumption, *Electrochemical analysis, *Heterojunctions
Abstract: Electrochemical CO2 reduction (eCO2R) to valuable chemicals or fuels offers an effective solution to alleviate the energy crisis and environmental challenges. Reducing the overpotential of a desired product for eCO2R is paramount to achieving high energy efficiency. Herein, CuO/In2O3 (Cu4.2In1) nanosheets (NSs) p‐n heterojunction with the built‐in electric field which enhances the surficial hydroxyl coverage achieving the greatly decreased overpotential for CO production by eCO2R. The Faraday efficiency of CO attains 96.5% under an impressively low overpotential (130 mV), which is one of the lowest among the reported catalysts for CO production. Additionally, the eCO2R system integrates with a commercial triple‐junction solar cell exhibiting an average solar‐to‐CO conversion energy efficiency of 7.9%, with the CO production rate of 0.73 mmol h−1 cm−2. The built‐in electric field between the CuO/In2O3 (Cu4.2In1) NSs heterojunction increases the oxidation states of Cu ions (Cuδ+, δ = 2.14), which enhances the surficial hydroxyl coverage by the strong electrostatic attraction at low overpotentials, consequently stabilizing *COOH intermediate and facilitating the desorption of *CO. This work provides a new solution to achieve energy efficient eCO2R by the surficial hydroxyl coverage manipulation. [ABSTRACT FROM AUTHOR]
Database: Energy & Power Source
Description
Abstract:Electrochemical CO2 reduction (eCO2R) to valuable chemicals or fuels offers an effective solution to alleviate the energy crisis and environmental challenges. Reducing the overpotential of a desired product for eCO2R is paramount to achieving high energy efficiency. Herein, CuO/In2O3 (Cu4.2In1) nanosheets (NSs) p‐n heterojunction with the built‐in electric field which enhances the surficial hydroxyl coverage achieving the greatly decreased overpotential for CO production by eCO2R. The Faraday efficiency of CO attains 96.5% under an impressively low overpotential (130 mV), which is one of the lowest among the reported catalysts for CO production. Additionally, the eCO2R system integrates with a commercial triple‐junction solar cell exhibiting an average solar‐to‐CO conversion energy efficiency of 7.9%, with the CO production rate of 0.73 mmol h−1 cm−2. The built‐in electric field between the CuO/In2O3 (Cu4.2In1) NSs heterojunction increases the oxidation states of Cu ions (Cuδ+, δ = 2.14), which enhances the surficial hydroxyl coverage by the strong electrostatic attraction at low overpotentials, consequently stabilizing *COOH intermediate and facilitating the desorption of *CO. This work provides a new solution to achieve energy efficient eCO2R by the surficial hydroxyl coverage manipulation. [ABSTRACT FROM AUTHOR]
ISSN:16146832
DOI:10.1002/aenm.71003