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Stabilizing Oxidation State of Cu via Ce Doping into La2CuO4 for Enhanced Electroreduction of CO2 to Multicarbon Products
Small Methods ( IF 9.1 ) Pub Date : 2025-03-12 , DOI: 10.1002/smtd.202500005
Tingting Wan 1 , Chunmei Lv 2 , Ke Ye 2 , Mingchan Ma 3 , Di Hu 3 , Juanxiu Xiao 4 , Wei Xiao 1
Affiliation  

Stabilizing oxidation state of Cu (Cuδ+, δ > 0) sites is the key‐enabling issue for electrocatalytic carbon dioxide (CO2) reduction reaction (eCO2RR) to multicarbon (C2+) products. The present study addresses this challenge by introducing cerium (Ce) doping into La2CuO4. The Ce doping facilitates fd orbital coupling between Ce 4f and Cu 3d orbitals, suppressing electron enrichment around Cu atoms by transferring electrons from Cu 3d orbitals to Ce 4f orbitals via a Cu−O−Ce chain. These changes modulate the electronic structure of Cu, reduce the distance between neighboring Cu atoms, optimize the binding energy of surface‐adsorbed CO (*CO), and lower the reaction energy barrier for *CO dimerization. As a result, the La1.95Ce0.05CuO4 catalyst achieves a Faradaic efficiency up to 81% for C2+ products and maintains high stability over 50 h operation. This work highlights the unique role of Ce doping in stabilizing Cuδ+ sites and hence enhancing C−C coupling, providing a pathway for designing efficient catalysts for eCO2RR.

中文翻译:


通过将 Ce 掺杂到 La2CuO4 中来稳定 Cu 的氧化态,以增强 CO2 电还原为多碳产品



稳定 Cu (Cuδ+, δ > 0) 位点的氧化态是电催化二氧化碳 (CO2) 还原反应 (eCO2RR) 生成多碳 (C2+) 产物的关键使能问题。本研究通过将铈 (Ce) 掺杂引入 La2CuO4 来应对这一挑战。Ce 掺杂促进了 Ce 4f 和 Cu 3d 轨道之间的 f-d 轨道耦合,通过通过 Cu-O-Ce 链将电子从 Cu 3d 轨道转移到 Ce 4f 轨道,从而抑制 Cu 原子周围的电子富集。这些变化调节了 Cu 的电子结构,缩短了相邻 Cu 原子之间的距离,优化了表面吸附的 CO (*CO) 的结合能,并降低了 *CO 二聚化的反应能垒。因此,La1.95Ce0.05CuO4 催化剂对 C2+ 产品实现了高达 81% 的法拉第效率,并在 50 小时的运行中保持高稳定性。这项工作突出了 Ce 掺杂在稳定 Cuδ+ 位点从而增强 C-C 偶联方面的独特作用,为设计高效的 eCO2RR 催化剂提供了途径。
更新日期:2025-03-12
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