V₂O₅ Surface Electronic Structure Suppresses Ethane Over-Oxidation, Enabling 65% Ethylene Yield.

Authors

Hongjuan Tao, Yan Chen, Suting He, Benchi Chen, Zhibo Shang, Zilin Ma, Xueming Liu, Liyuan Chai, Zhang Lin

Published in

Angewandte Chemie (International ed. in English). Pages e8633105. Jun 20, 2026. Epub Jun 20, 2026.

Abstract

Electrochemical oxidative dehydrogenation (ODH) of ethane in solid oxide electrolysis cells (SOECs) offers an energy-efficient route to ethylene but faces a trade-off between conversion and selectivity due to over-oxidation. Conventional voltage-current regulation can suppress deep oxidation but inevitably compromises ethane conversion. Here, we engineer surface electronic structures by depositing a V₂O₅ layer on SrFe_0.9Ti_0.1O_3-δ (STF), introducing intrinsic O 2p (-1.33 eV) and V 3d (-0.18 eV) states closer to the Fermi level than in STF (-1.49/-4.52 eV). Density functional theory and operando infrared spectroscopy reveal three synergistic effects: enhanced ethane adsorption (ΔE_ads -0.33 vs. -0.11 eV), reduced first dehydrogenation barrier (ΔG₁ 1.13 vs. 1.15 eV), and promoted ethylene desorption ((ΔG_des-ΔG₃) -4.98 vs. -1.92 eV). The optimized anode delivers 65% yield and 90% selectivity at 750°C, exceeding unmodified STF by 10%. This work highlights band-center engineering as a promising design concept for regulating hydrocarbon electrode reactions.

PMID:
42322169
Bibliographic data and abstract were imported from PubMed on 20 Jun 2026.

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