V <sub>2</sub> O <sub>5</sub> Surface Electronic Structure Suppresses Ethane Over‐Oxidation, Enabling 65% Ethylene Yield
Abstract
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 V 2 O 5 layer on SrFe 0.9 Ti 0.1 O 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 (Δ E ads ‐0.33 vs. ‐0.11 eV), reduced first dehydrogenation barrier (Δ G 1 1.13 vs. 1.15 eV), and promoted ethylene desorption ((Δ G des ‐Δ G 3 ) ‐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.
Article Details
Authors (9)
Hongjuan Tao
Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou China
Yan Chen
Suting He
Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou China
Benchi Chen
Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou China
Zhibo Shang
Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou China
Zilin Ma
Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling School of Environment and Energy South China University of Technology Guangzhou China
Xueming Liu
Liyuan Chai
School of Metallurgy and Environment
Zhang Lin
School of Metallurgy and Environment