Ceo2/Cus Nanoplates Electroreduce Co2 to Ethanol with Stabilized Cu+ Species,Small

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Ceo2/Cus Nanoplates Electroreduce Co2 to Ethanol with Stabilized Cu+ Species
Small ( IF 13.0 ) Pub Date : 2023-06-03 , DOI: 10.1002/smll.202303099
Zi Yang ₁ , Deguang Ji ₁ , Zhi Li ₁ , Zidong He ₁ , Yang Hu ₁ , Jie Yin ₁ , Yichao Hou ₁ , Pinxian Xi _{1,

2} , Chun-Hua Yan _{1,

3}

Affiliation

Copper-based electrocatalysts effectively produce multicarbon (C₂₊) compounds during the electrochemical CO₂ reduction (CO₂RR). However, big challenges still remain because of the chemically unstable active sites. Here, cerium is used as a self-sacrificing agent to stabilize the Cu⁺ of CuS, due to the facile Ce³⁺/Ce⁴⁺ redox. CeO₂-modified CuS nanoplates achieve high ethanol selectivity, with FE up to 54% and FE_C2+ ≈ 75% in a flow cell. Moreover, in situ Raman spectroscopy and in situ Fourier-transform infrared spectroscopy indicate that the stable Cu⁺ species promote CC coupling step under CO₂RR. Density functional theory calculations further reveal that the stronger ^*CO adsorption and lower CC coupling energy, which is conducive to the selective generation of ethanol products. This work provides a facile strategy to convert CO₂ into ethanol by retaining Cu⁺ species.

中文翻译：

Ceo2/Cus 纳米板用稳定的 Cu+ 物质将 Co2 电还原为乙醇

铜基电催化剂在电化学CO ₂还原(CO _{2 RR)过程中有效地产生多碳(C}₂₊ )化合物。然而，由于化学不稳定的活性位点，仍然存在巨大的挑战。这里，由于容易进行Ce ³⁺ /Ce ⁴⁺氧化还原，所以使用铈作为自牺牲剂来稳定CuS的Cu ⁺。CeO ₂修饰的CuS纳米板实现了高乙醇选择性，在流通池中FE高达54%，FE _{C2+ ≈ 75%。}此外，原位拉曼光谱和原位傅立叶变换红外光谱表明，稳定的Cu ⁺物质促进了CO _{2 RR下的C}→ C偶联步骤。密度泛函理论计算进一步揭示^{* CO吸附能力更强，}CC耦合能更低，有利于乙醇产物的选择性生成。^{这项工作提供了一种通过保留Cu +物质将CO}₂转化为乙醇的简便策略。

更新日期：2023-06-03

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